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输入电压可达550V的LED驱动用控制IC

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  • 日期: 2013-12-06
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标签: 输入电压可达550V的LED驱动用控制IC

        美国Clare上市了输入电压范围宽达+8~550V的LED驱动用控制IC“CPC9909N”,新产品采用了将峰值电流保持在一定水平的PFM控制方式。占空比最大可设定为50%。内置功率MOSFET的栅极驱动电路。功率MOSFET需要外置。

CPC9909 High Efficiency, Off-Line, High Brightness LED Driver Features • 8VDC to 550VDC Input Voltage Range • >90% Efficiency • Stable Operation at >50% Duty Cycle • Drives Multiple LEDs in Series/Parallel • Regulated LED Current • Linear or PWM Brightness Control Inputs • Resistor-Programmable Minimum Off-Time • SOIC-8 RoHS Compliant Package • Buck or Boost Configuration Applications • Flat-Panel Display RGB Backlighting • Signage and Decorative LED Lighting • DC/DC or AC/DC LED Driver Applications Pb RoHS 2002/95/EC e3 CPC9909 Block Diagram VDD VIN RT LD PW MD Voltage Regulator Voltage Reference + + Description The CPC9909 is a low cost, high-efficiency, offline, high-brightness (HB) LED driver manufactured using Clare’s high voltage BCDMOS on SOI process. This driver has an internal regulator that allows it to operate from 8VDC to 550VDC . This wide input operating voltage range enables the driver to be used in a broad range of HB LED applications. The CPC9909 features pulse frequency modulation (PFM) with a constant peak-current control scheme. This regulation scheme is inherently stable, allowing the driver to be operated above 50% duty cycle without open loop instability or sub-harmonic oscillations. LED dimming can be implemented by applying a small DC voltage to the LD pin, or by applying a low frequency PWM signal to the PWMD pin. The CPC9909 is available in a standard 8-lead SOIC package and a thermally enhanced 8-lead SOIC package with an exposed thermal pad (EP). Ordering Information Part CPC9909N CPC9909NTR CPC9909NE CPC9909NETR Description SOIC-8 (100/Tube) SOIC-8 Tape & Reel (2000/Reel) SOIC-8 EP (Exposed Pad) (100/Tube) SOIC-8 EP (Exposed Pad)Tape & Reel (2000/Reel) CPC9909 RT Minimum Off-Time Q One Shot TRIG SQ R GATE CS GND DS-CPC9909 - R01 www.clare.com 1 CPC9909 1. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1 Package Pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.2 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.3 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.4 Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.5 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.6 Thermal Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.2 LED Driver Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.3 Input Voltage Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.4 Current Sense Resistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.5 Current Sense Blanking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.6 Enable/Disable Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.7 Minimum Off-Time One-Shot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.8 Inductor Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.9 Gate Output Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.10 Linear Dimming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.11 PWM Dimming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.12 Combination Linear and PWM Dimming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3. Manufacturing Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.1 Mechanical Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.2 Packaging Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.3 Soldering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.4 Washing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 R01 www.clare.com 2 1. Specifications 1.1 Package Pinout VIN 1 CS 2 GND 3 GATE 4 8 RT 7 LD 6 VDD 5 PWMD CPC9909 1.2 Pin Description Pin# Name Description 1 VIN Input voltage LED Current Sense input. Internal current 2 CS sense threshold is set at VCS(high). The external sense resistor sets the maximum LED current. 3 GND Device Ground 4 GATE External MOSFET gate driver output 5 PWMD Low-frequency PWM dimming control input with internal pull-down resistor. Regulated supply voltage output. Requires a 6 VDD storage capacitor to GND. Can be overdriven by external voltage applied to VDD . Linear Dimming. Apply a voltage less than 7 LD VCS(high) to dim the LED(s). 8 RT Resistor to GND sets the minimum off-time. Electrical and thermal conductive pad on the EP - bottom of CPC9909NE. Connect this pad to ground and provide sufficient thermal coupling to remove heat from the package. 1.3 Absolute Maximum Ratings Parameter Input Voltage to GND Inputs and Outputs Voltage to GND VDD , Externally Applied Power Dissipation: SOIC-8 With Thermal Tab SOIC-8 W/O Thermal Tab Junction Temperature, Operating Operating Temperature Storage Temperature Symbol Maximum Unit VIN -0.5 to +560 V CS, LD, PWMD, GATE -0.3 to VDD+0.3 V VDD.EXT 15 V PD TJ TA TSTG 2.5 W 0.975 W -40 to +150 °C -40 to +85 °C -55 to +150 °C Electrical absolute maximum ratings are at 25ºC. Absolute maximum ratings are stress ratings. Stresses in excess of these ratings can cause permanent damage to the device. Functional operation of the device at conditions beyond those indicated in the operational sections of this data sheet is not implied. R01 www.clare.com 3 CPC9909 1.4 Recommended Operating Conditions Parameter Input Voltage Range PWMD Frequency Operating Temperature Symbol VIN fPWMD TA Minimum Typical Maximum Unit 12 - 550 VDC - 500 - Hz -40 - +85 °C 1.5 Electrical Characteristics Unless otherwise specified, all electrical specifications are provided for TA=25°C. Parameter Conditions Symbol Minimum Typical Maximum Unit Input Input Voltage Range DC Input Voltage VIN Shut-Down Mode Supply Current VIN=8 to 550V, PWMD to GND IIN Regulator 8 - 550 VDC - 0.3 0.6 mA Voltage Regulator Output VDD Current Available for External Circuitry VIN=15V to 550V, IDD=0, IGATE=0 - VDD 7.2 7.8 8.4 VDC IDD - - 2 mA VDD Load Regulation PWM Dimming VIN=15V, IDD=1mA ΔVDD - 150 200 mV PWMD Input Low Voltage PWMD Input High Voltage PWMD Pull-Down Resistance Current Sense Comparator VIN=8V to 550V VIN=8V to 550V - VPWMD(low) - VPWMD(high) 2.4 - 0.5 - V RPWMD 80 115 150 kΩ Current Sense Input Current Input Low Input High Current Sense Threshold Voltage Current Sense Blanking Interval Delay from CS Trip to Gate Low Minimum Off-Time One-Shot Minimum Off-Time Gate Driver CS=0V CS=VDD -40°C < TA < 85°C RT=400kΩ RT=400kΩ RT=400kΩ IIL IIH -5 -5 0 5 μA 5 VCS(high) 200 250 300 mV tBLANK - 400 - ns tDELAY - 300 - ns toff 6 - 8 μs Gate High Output Voltage Gate Low Output Voltage Gate Output Rise Time Gate Output Fall Time IOUT=-10mA IOUT=+10mA CGATE=500pF CGATE=500pF VGATE(high) VDD-0.3 VDD-0.06 - VGATE(low) - 0.03 0.3 V tRISE tFALL - 16 7 ns - 1.6 Thermal Characteristics Parameter Thermal Resistance, Junction-to-Ambient Package Symbol Minimum Typical Maximum Unit SOIC-8 With Thermal Pad (NE) 1 SOIC-8 W/O Thermal Pad N) RθJA - 50 128 - °C/W - 1 Use of a four-layer PCB can improve thermal dissipation (reference EIA/JEDEC JESD51-5). 4 www.clare.com R01 2. Functional Description Figure 1 Typical Application Circuit 8 - 550V VDD VDD VIN Voltage Regulator RT Voltage Reference + LD - + CVDD PW MD RT CPC9909 RT Minimum Off-Time Q One Shot TRIG SQ R GND CPC9909 D1 L1 Q1 GATE CS RSENSE Buck Configuration 2.1 Overview The CPC9909 drives the LEDs via a minimum off-time, peak-current-limited, pulse-frequency modulation scheme. This control scheme is inherently stable, and the driver can be operated above a 50% duty cycle without any open-loop instability or sub-harmonic oscillations. Since the switching frequency depends on the LED load current, it results in a high efficiency operation. 2.2 LED Driver Theory of Operation The typical application circuit is as shown in Figure 1 When PWMD is high, the control circuit is enabled and the gate driver turns on the external power MOSFET (Q1), causing the inductor (L1) current to ramp up until the voltage across the current sense resistor (RSENSE) exceeds VCS(high). When the voltage at the CS pin exceeds this threshold, the gate driver turns Q1 off. Q1 remains off for the duration of the fixed minimum off-time. While the switch is off, the inductor continues to deliver the current to the load though the diode (D1). When the off-time expires, Q1 turns on again until the peak current limit is reached, and the process repeats. The peak current limit threshold is set by the external sense resistor, RSENSE, and the internal voltage threshold, VCS(high). This internal voltage threshold can also be set externally via the LD pin. The lower of these two thresholds and RSENSE set the peak current in the inductor. A soft start function can be implemented by ramping up the DC voltage at the LD pin from 0V to VCS(high) at the desired rate. To utilize the soft start function, connect a resistor divider from VDD to ground and a capacitor from the LD pin to ground, as shown in Figure 2. Figure 2 Soft-Start Circuit CPC9909 VIN CS GND GATE RT LD VDD PWMD 51kΩ 2.2kΩ 0.1μF R01 www.clare.com 5 CPC9909 2.3 Input Voltage Regulator The CPC9909 has an internal voltage regulator that can work with input voltages ranging from 12VDC to 550VDC. When a DC voltage greater than 12V is applied at the VIN pin, the internal voltage regulator regulates the voltage down to a typical 7.8V. The VDD pin is the internal voltage regulator output pin and must be bypassed by a low-ESR capacitor to provide a low impedance path for high frequency switching noise. The CPC9909 driver does not require the bulky start-up resistors typically needed for off-line controllers. The internal voltage regulator provides sufficient voltage and current to power internal IC circuits. This voltage is also available at the VDD pin, and can be used as a bias voltage for external circuitry. The internal voltage regulator can be bypassed by applying an external DC voltage to the VDD pin that is slightly higher than the internally generated regulator voltage. This reduces the power dissipation of the integrated circuit, and it is more suitable in isolated applications where an auxiliary winding can be used to drive the VDD pin. The total input current drawn from the VIN pin is equal to the quiescent current drawn by the internal circuitry (which is specified at 0.6mA maximum) plus the gate driver current. See “Shut-Down Mode Supply Current” in Section 1.5 “Electrical Characteristics” on page 4. The current draw of the gate driver depends on the switching frequency and the gate charge of the external power MOSFET. The total input current can be calculated by: IIN ≈ 0.6mA + (QGATE × fS) Where QGATE is the total gate charge of the MOSFET and fS is the oscillator external frequency. 2.4 Current Sense Resistor The peak LED current is set by an external sense resistor (RSENSE) connected from the CS pin to ground. The value of the current sense resistor is calculated based on the average LED current desired, the current sense threshold, and the inductor ripple current. The peak-to-peak difference in the inductor current waveform is referred to as inductor ripple current (the inductor is typically selected to be large enough to keep this ripple within 30% of the average). Factor in the ripple current when calculating the sense resistor. The current sense resistor value can be found by: RSENSE = ------V----C----S--(--h---i--g--h---)-----ILED + 0.5ΔIL Where: • VCS(high) = current sense threshold =0.25V (or VLD) • ILED = average LED/inductor current • ΔIL = inductor ripple current = 0.3*ILED Combining terms: RSENSE = ---V----C---S---(--h---i-g---h---)-1.15 • ILED 2.5 Current Sense Blanking The CPC9909 has an internal current sense blanking circuit. When the power MOSFET is turned on, the external inductor can cause an undesired spike at the current sense pin, initiating a premature termination of the gate pulse. To avoid this condition, a typical 400ns internal leading edge blanking time is implemented, thereby eliminating the need for external RC filtering, and simplifying the design. During the current sense blanking time, the current limit comparator is disabled, preventing the gate-drive circuit from terminating the gate-drive signal. 2.6 Enable/Disable Function Connecting the PWMD pin to VDD enables the gate driver. Connecting PWMD to GND disables the gate driver and sets the device in standby mode. In standby mode, the quiescent current is 0.6mA maximum. 2.7 Minimum Off-Time One-Shot The CPC9909 uses a fixed off-time control scheme. The minimum off-time is set by an external resistor connected between the RT and GND terminals. The off-time can be determined by: toff(μs) = {[(RT(kΩ)) ⁄ 66] + 0.8} Off-time selection indirectly determines the switching frequency of the LED driver. 6 www.clare.com R01 The switching frequency is determined by: FS = 1-----–----D--toff Where: • D = duty cycle • toff = Off-time In general, switching frequency selection is based on the inductor size, controller power dissipation, and the input filter capacitor. The typical off-line LED driver switching frequency, fS, is between 30 kHz and 120 kHz. This operating range gives the designer a reasonable compromise between switching losses and inductor size. The internal off-time one-shot has an accuracy of ±20%. The figure below shows the RT resistor selection for the desired off-time. toff (uS ) RT vs Off-Time 45 40 35 30 25 20 15 toff (μS) 10 5 0 0 500 1000 1500 2000 2500 3000 RT (KΩ) CPC9909 The minimum inductor value for a given ripple current is: LMIN = V----L---E----D---s--t--r--i--n---g ΔIL × toff Where: • ΔIL = Ripple Current The inductor peak current is given by: ILPeak = ILED + 0.5ΔIL 2.9 Gate Output Drive The CPC9909 uses an internal gate drive circuit to turn on and off an external power MOSFET. The gate driver can drive a variety of MOSFETs. For a typical off-line application, the total MOSFET gate charge will be less than 25nC. 2.8 Inductor Design The inductor value is defined by the LED/inductor ripple current, minimum off time, and the output voltage. The minimum off time is determined by the duty cycle and switching frequency. The duty cycle is given by: D = V----L---E----D---s---t-r--i--n---g Vin(min) Where: • VLEDstring is the LED string voltage at the desired average LED current. • Vin(min) is the minimum DC input voltage. R01 www.clare.com 7 CPC9909 2.10 Linear Dimming A linear dimming function can be implemented by applying a DC control voltage to the LD pin. By varying this voltage from 0V to VCS(high), the user can adjust the current level in the LEDs which in turn will increase or decrease the light intensity. The control voltage to the LD pin can be generated from an external voltage divider network from VDD. This function is useful if the Figure 3 Typical Linear Dimming Application Circuit user requires LED current of a particular level, and there is no exact RT value available. Note that applying a voltage higher than the current sense threshold voltage to the LD pin will not change the output current due to the fixed internal threshold setting. When the LD pin is not used, it should be connected to VDD. Fuse F2 2A AC Input 90 - 265Vrms NTC1 BR1 AC - AC + D1 BYV26B C1 0.1μF 400V C1 22μF 400V HB LEDs 350mA L1 4.7mH IXTA8N50P R4 0.56Ω LD Monitor R1 402kΩ CPC9909 VIN CS GND GATE RT LD VDD PWMD C1 2.2μF 16V C1 0.1μF 25V R2 51kΩ RA1 5.0kΩ 2.11 PWM Dimming Pulse width modulation dimming can be implemented by driving the PWMD pin with a low frequency square wave signal in the range of a few hundred Hertz. The PWMD signal controls the LED brightness by gating the PWM gate driver output pin GATE. The signal can be generated by a microcontroller or a pulse generator with a duty cycle proportional to the amount of desired light output. Figure 4 Buck Driver for PWM Dimming Application Circuit VIN 12 - 30VDC 10μF 50V D1 Schottky 40V 220μH Q1 CPC9909 V IN CS GND GATE R T LD VDD PWMD 402kΩ R1 0.27Ω 0.1μF 50V HB LEDs 900mA Max ASMT-Mx00 CPC1001N* PWM *Optional Isolation 2.12 Combination Linear and PWM Dimming A combination of linear and PWM dimming techniques can be used to achieve a large dimming ratio. 8 www.clare.com R01 3. Manufacturing Information CPC9909 3.1 Mechanical Dimensions 3.1.1 8-Pin SOIC Package 8-Pin SOIC Package 0.19 - 0.25 (0.008 - 0.010) 5.80 - 6.20 (0.23 - 0.24) PIN 1 0.33 - 0.51 (0.013 - 0.020) 4.80 - 5.00 (0.19 - 0.20) 0.394 - 0.648 (0.016 - 0.026) 3.80 - 4.00 (0.15 - 0.16) 1.27 TYP (0.05 TYP) 0.10 - 0.25 (0.004 - 0.010) 1.35 - 1.75 (0.053 - 0.069) 0.40 - 1.27 (0.016 - 0.050) Recommended PCB Land Pattern 1.55 (0.061) 5.40 (0.213) 0.60 (0.024) 1.27 (0.050) Dimensions mm (inches) 3.1.2 8-Pin SOIC EP Package 8-Pin SOIC Package with Exposed Thermal Pad 0.19 - 0.25 (0.008 - 0.010) 5.80 - 6.20 (0.23 - 0.24) PIN 1 0.33 - 0.51 (0.013 - 0.020) 3.80 - 4.00 (0.15 - 0.16) 1.27 TYP (0.05 TYP) 4.80 - 5.00 (0.19 - 0.20) 0.394 - 0.648 (0.016 - 0.026) 0.00 - 0.13 (0.000 - 0.005) 1.35 - 1.75 (0.053 - 0.069) 0.40 - 1.27 (0.016 - 0.050) Recommended PCB Land Pattern 1.55 (0.061) 2.40 (0.09) 2.40 (0.09) 5.40 (0.213) 2.032 - 2.413 (0.080 - 0.095) 0.60 (0.024) 1.27 (0.050) 2.032 - 2.413 (0.080 - 0.095) Dimensions mm (inches) Note: Thermal pad should be electrically connected to GND, pin 3. R01 www.clare.com 9 CPC9909 3.2 Packaging Information For both the SOIC-8 and the SOIC-8 EP Packages. 330.2 DIA. (13.00 DIA.) Top Cover Tape Thickness 0.102 MAX. (0.004 MAX.) B0=5.30 (0.209) W=12.00 (0.472) Embossed Carrier K0= 2.10 (0.083) A0=6.50 (0.256) P=8.00 (0.315) User Direction of Feed Dimensions mm (inches) Embossment NOTE: Tape dimensions not shown comply with JEDEC Standard EIA-481-2 3.3 Soldering For proper assembly, this component must be processed in accordance with the current revision of IPC/JEDEC standard J-STD-020. Failure to follow the recommended guidelines may cause permanent damage to the device resulting in impaired performance and/or a reduced lifetime expectancy. 3.4 Washing Clare does not recommend ultrasonic cleaning of this part. Pb RoHS 2002/95/EC e3 For additional information please visit www.clare.com Clare, Inc. makes no representations or warranties with respect to the accuracy or completeness of the contents of this publication and reserves the right to make changes to specifications and product descriptions at any time without notice. Neither circuit patent licenses or indemnity are expressed or implied. Except as set forth in Clare’s Standard Terms and Conditions of Sale, Clare, Inc. assumes no liability whatsoever, and disclaims any express or implied warranty relating to its products, including, but not limited to, the implied warranty of merchantability, fitness for a particular purpose, or infringement of any intellectual property right. The products described in this document are not designed, intended, authorized, or warranted for use as components in systems intended for surgical implant into the body, or in other applications intended to support or sustain life, or where malfunction of Clare’s product may result in direct physical harm, injury, or death to a person or severe property or environmental damage. Clare, Inc. reserves the right to discontinue or make changes to its products at any time without notice. Specifications: CPC9909 - R01 © Copyright 2010, Clare, Inc. All rights reserved. Printed in USA. 1/27/10 10 www.clare.com R01
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