Preliminary Datasheet EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH General Description Features The AP3609 is an eight-channel constant current sink with current match used for LED driver. It uses an external resistor to set the current for eight LED strings with an accuracy of ±1.5%. The full scale LED current can be adjusted from 10mA to 100mA for each channel. The LED light can be adjusted by PWM dimming function. · · · · · · · · · The device can keep working when LED opens without damage. It features under voltage lockout protection and over temperature protection. The AP3609 has two interface terminals (FB and FBX). They enable the device to be connected in parallel. AP3609 Input Voltage Range: 4.2V to 5.5V Typical Output Current: 480mA (60mA/1V per Channel) Maximum Output Current: 800mA (100mA/1.5V per Channel) Current Match Accuracy: ±1.5% PWM Dimming Control Open LED Self-check and Protection Under Voltage Lockout Protection Over Temperature Protection Enable Parallel Application Applications · · · · The AP3609 is available in SOIC-16 package. Notebook LCD Display Modules LCD Monitor LCD TV SOIC-16 Figure 1. Package Type of AP3609 May 2013 Rev. 2. 0 BCD Semiconductor Manufacturing Limited 1 Preliminary Datasheet EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH AP3609 Pin Configuration M Package (SOIC-16) CH1 1 16 EN CH2 2 15 VCC CH3 3 14 AGND CH4 4 13 FB PGND 5 12 ISET CH5 6 11 FBX CH6 7 10 PWM CH7 8 9 CH8 Figure 2. Pin Configuration of AP3609 (Top View) Pin Description Pin Number Pin Name Function 1, 2, 3, 4, 6, 7, 8, 9 CH1 to CH8 White LED cathode connection pin. These pins should be connected to GND if not used 5 PGND Ground pin. It would be useful when connected with PGND and exposed pad 10 PWM PWM dimming control pin. Adding a PWM signal to this pin to control LED dimming (see Figure 10 for detail dimming control mode). If not used, connect it to the high level 11 FBX This pin is an interface terminal. Connecting it with FB pin can achieve parallel application. If not used, leave it unconnected 12 ISET LED current set pin. An external resistor is connected to this pin to set the current of each channel according to ICHANNEL=1.194*400/RISET 13 FB Feedback pin. This pin is an interface terminal, which samples the voltage of each channel, and outputs the lowest voltage of the string to DC/DC converter 14 AGND 15 VCC 16 EN Ground pin. It would be useful when connected with PGND and exposed pad Input voltage pin Enable pin. Logic high enables the IC and logic low disables the IC May 2013 Rev. 2. 0 BCD Semiconductor Manufacturing Limited 2 Preliminary Datasheet EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH AP3609 Functional Block Diagram VCC GND 15 EN 5, 14 EN Logic 16 Bandgap OTP UVLO Time Out EN 8 STG (Short To GND) VREF CH1...CH8 3V 100mV 11 CH1...CH8 FBX 8 100mV Test Max.(CH1...CH8) Min.(CH1...CH8,FBx) COMP EN 13 FB CH8 CH7 CH6 CH5 CH4 CH3 CH2 CH1 DFF 1 100:1 8 VCC VCC VREF OPA + 4 EN 16 Current Sink Current Sink Current Sink Current Sink Current Sink ISET Current Sink 12 Current Sink PWM 10 PWM Dimming CH1 Current Sink 2 3 4 6 7 8 9 CH2 CH3 CH4 CH5 CH6 CH7 CH8 Figure 3. Functional Block Diagram of AP3609 May 2013 Rev. 2. 0 BCD Semiconductor Manufacturing Limited 3 Preliminary Datasheet EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH AP3609 Ordering Information AP3609 - Circuit Type G1: Green Package TR: Tape and Reel M: SOIC-16 Package Temperature Range SOIC-16 -40 to 85oC Part Number Marking ID AP3609MTR-G1 AP3609M-G1 Packing Type Tape & Reel BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant and green. Absolute Maximum Ratings (Note 1) Parameter Symbol Value Unit VCC -0.3 to 6 V VISET -0.3 to 6 V EN Pin Voltage VEN -0.3 to 6 V Feedback Pin Voltage VFB -0.3 to 6 V PWM Pin Voltage VPWM -0.3 to 6 V Voltage per Channel (Note 2) VCHX -0.3 to 40 V Thermal Resistance (Junction to Ambient, no Heat Sink) θJA 80 oC/W Operating Junction Temperature TJ 150 oC Storage Temperature Range TSTG -65 to 150 oC Lead Temperature (Soldering, 10sec) TLEAD 260 oC ESD (Machine Model) 200 V ESD (Human Body Model) 6000 V Input Voltage ISET Pin Voltage Note 1: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Maximum Ratings" for extended periods may affect device reliability. Note 2: Breakdown voltage. May 2013 Rev. 2. 0 BCD Semiconductor Manufacturing Limited 4 Preliminary Datasheet EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH AP3609 Recommended Operating Conditions Parameter Symbol Min Max Unit Input Voltage VCC 4.2 5.5 V Recommended PWM Dimming Frequency fPWM 0.1 25 kHz 10 25 10 65 10 110 -40 85 VCHX≥0.5V Full Scale Setting Current per Channel ICHX VCHX≥1V VCHX≥1.5V TA Operating Temperature Range mA oC Electrical Characteristics Limits in standard typeface are guaranteed for VIN=VEN=5V, RISET=8kΩ,, TA=25oC, unless otherwise specified. Parameter Symbol Conditions Min Typ Max Unit 5.5 V Input Section Input Voltage Quiescent Current Shutdown Quiescent Current VIN 4.2 IQ No load 0.5 1 mA ISDB VEN=0V 0.1 1 µA 3.8 4.0 V Under Voltage Lockout Threshold VUVLO Under Voltage Lockout Hysteresis VHUVLO Falling Edge 3.6 200 mV Current Sink Section ISET Reference Voltage 1.170 1.194 1.218 ICHX/ISET 370 400 430 VCHX=0.5V 23 45 65 70 VCHX=1.5V 110 120 I =60mA Current Matching between Any Two Channels ICH-MATCH CHX VCHX=1V -1.5 Current Multiplication Ratio Maximum Output Current per Channel Current Sink Saturation Voltage per Channel VISET K ICHX_MAX V CHX=1V mA 1.5 ICHX=20mA 0.45 VCHX_SAT I CHX=60mA 0.8 ICHX=100mA V % V 1.2 Output Current Line Regulation VCC=4.2V to 5.5V 2 %/V Output Current Load Regulation VCHX=0.5V to 2.8V 4 % May 2013 Rev. 2. 0 BCD Semiconductor Manufacturing Limited 5 Preliminary Datasheet EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH AP3609 Electrical Characteristics (Continued) Limits in standard typeface are guaranteed for VIN=VEN=5V, RISET=8kΩ,, TA=25oC, unless otherwise specified. Parameter Symbol Conditions Min Typ Max Unit Enable Section EN Pin High Level Threshold Voltage VIH_EN EN Pin Low Level Threshold Voltage VIL_EN 1.8 V 0.8 V PWM Dimming Section PWM High Level Threshold Voltage VIH_PWM PWM Low Level Threshold Voltage VIL_PWM 1.8 V 0.8 V Interface Section Feedback Output Current IFB 5 15 µA Total Device Self-check Voltage @ Open LED VCHECK 3.0 V Thermal Shutdown Temperature TOTSD 160 oC Thermal Shutdown Hysteresis THYS 20 oC Typical Performance Characteristics 22.0 20 21.5 18 Current per Channel (mA) Current per Channel (mA) VIN=V EN=5V, RISET=8kΩ,, TA=25oC, unless otherwise specified. 21.0 20.5 20.0 19.5 19.0 14 12 10 8 6 4 RISET=23K 18.5 18.0 -60 16 2 0 -40 -20 0 20 40 60 80 100 120 0 140 20 40 60 80 100 Duty Cycle (%) o Temperature ( C) Figure 5. Current per Channel vs. Duty Cycle Figure 4. Current per Channel vs. Temperature May 2013 Rev. 2. 0 BCD Semiconductor Manufacturing Limited 6 Preliminary Datasheet EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH AP3609 Typical Performance Characteristics (Continued) VIN=V EN=5V, RISET=8kΩ,, TA=25oC, unless otherwise specified. 61.0 Current per Channel (mA) Current per Channel (mA) 61.0 60.5 60.0 59.5 59.0 4.0 4.2 4.4 4.6 4.8 5.0 5.2 5.4 60.5 60.0 59.5 59.0 0.5 5.6 1.0 1.5 Input Voltage (V) 2.5 3.0 3.5 Figure 7. Current per Channel vs. Voltage per Channel Figure 6. Current per Channel vs. Input Voltage 0.5 140 120 Feedback Voltage (V) Maximum Output Current (mA) 2.0 Voltage per Channel (V) 100 80 60 0.4 0.3 0.2 40 0.1 20 0 0.4 0.6 0.8 1.0 1.2 1.4 0.0 0.000 1.6 0.002 0.004 0.006 0.008 0.010 0.012 0.014 0.016 0.018 Feedback Current (mA) Voltage per Channel (V) Figure 8. Maximum Output Current vs. Voltage per Channel May 2013 Rev. 2. 0 Figure 9. Feedback Voltage vs. Feedback Current BCD Semiconductor Manufacturing Limited 7 Preliminary Datasheet EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH AP3609 Function Description I CHX_MAX = K ⋅ ISET The AP3609 is designed for LED display application which contains eight well-matched current sinks to provide constant current through LED. The full scale LED current can be adjusted from 10mA to 100mA per channel with an external resistor. If there is some channel unused, the channel pin should be connected to ground. The LED bright dimming can be achieved through PWM dimming. The LED current can be reduced from 100% by PWM dimming control. 2. PWM Dimming Mode The LED current can be adjusted by applying the PWM signal to PWM pin. On this mode, all enabled channels are adjusted at the same time and the brightness can be adjusted from 1%*ICHX_MAX to 100%*ICHX_MAX(@fDimming=2kHz). During the "high level" time of the PWM signal, the LED turns on and the 100% current flows through LED. During the "low level" time of the PWM signal, the LED turns off and almost no current flows through LED. So the average current through LED is changed and the brightness is adjusted. The external PWM signal frequency applied to PWM pin can be allowed to 100Hz or higher. The AP3609 can work with a DC/DC converter to drive LED arrays for good performance. The device can keep working when LED opens without damage, and it features under voltage lockout protection and over temperature protection. The detailed information will be discussed in open LED self-check and protection section. 1. LED Current Setting The maximum LED current can be set up to 100mA per channel by ISET pin. When the LED current is greater than 100mA, two or more channels can be paralleled to achieve larger drive current. To set the reference current ISET, connect a resistor RISET between this pin and ground. The value of RISET can be calculated by the following formula: An example for PWM dimming is shown in Figure 10. All 8 channels are set to the maximum current ICHX_MAX at the beginning. When a 50% duty cycle PWM signal is applied to PWM pin, average current valued 50%* ICHX_MAX flows through the 8 channels. When an 80% duty cycle PWM signal is applied to PWM pin, average current valued 80%*ICHX_MAX flows through the 8 channels. ISET = 1.194V / R ISET This reference current is multiplied internally with a gain (K) of 400, and then mirrored on all enabled channels. This sets the maximum LED current, referred to as 100% current (ICHX_MAX). The value can be calculated by the following formula: 50% duty cycle 80% duty cycle PWM ICH_MAX CH1...CH8 Current ICH_MAX I CH_MAX 0 0 Figure 10. PWM Dimming Example of AP3609 May 2013 Rev. 2. 0 BCD Semiconductor Manufacturing Limited 8 Preliminary Datasheet EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH AP3609 Function Description (Continued) 3. Open LED Self-Check and Protection The AP3609 can work with a DC/DC converter to achieve good performance, such as self-check and protection against open LED. The FB pin samples voltage of each channel, and outputs the lowest voltage to DC/DC converter. When AP3609 gets shutdown signal from EN pin or PWM voltage is low, AP3609 outputs a high Z signal (floating). The FB voltage should be decided by external pull-up resistor connected to it. Then the DC/DC converter can be controlled by AP3609. on remaining CHX pin reaches the self-check voltage 3V, the AP3609 begins looking up the open string. After finding the open channel, AP3609 removes the corresponding CHX pin from boost control loop, then the boost circuit is controlled in the normal manner. Once the circuit returns normal operation, the voltage on the CHX pin is regulated to the normal level. It is necessary to pay attention that the open strings are removed from boost regulation, but not disabled. If the open LED string is reconnected, it will sink current up to the programmed current level. If any enabled LED string opens, voltage on the corresponding CHX pin goes to zero and the FB pin outputs the zero voltage to boost converter. So the boost converter operates in open loop and the voltage on remaining CHX pin goes higher. Once the voltage 4. Parallel Operation Mode The AP3609 can be paralleled to drive more strings of LED. Connecting an AP3609 FB pin with another AP3609 FBX pin can achieve parallel application. More details please refer to Figure 11. May 2013 Rev. 2. 0 BCD Semiconductor Manufacturing Limited 9 Preliminary Datasheet EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH AP3609 Typical Application L1 VIN VO VCC REF C1 U1 AZ7500F DTC Q E1 OUTPUT CTRL EA2 8 VREF EA1 GND 7 6 CH7 CH6 CH5 CH8 PWM FBX 5 4 PGND U2 OVP Feedback 9 VREF 10 11 3 CH4 CH3 1 2 CH2 CH1 AP3609 ISET FB 12 13 AGND 14 VCC EN 16 15 + _ VFB From AP3609 5V From PWM Dimming Cascade Control AP3609 FB Signal or Float To 7500F FB signal Single Channel L1 VIN VO VCC REF C1 U1 AZ7500F DTC OUTPUT CTRL Q E1 EA2 VREF EA1 GND 8 7 6 5 CH7 CH6 CH5 PGND 4 CH4 3 2 1 CH3 CH2 CH1 U2 AP3609 OVP CH8 Feedback PWM 10 9 VREF FBX 11 ISET 12 FB 13 AGND 14 VCC EN 16 15 +_ VFB From AP3609 5V From PWM Dimming Cascade Control AP 3609 FB Signal or Float To 7500F FB signal Paralleled Channels Figure 11. Typical Applications of AP3609 May 2013 Rev. 2. 0 BCD Semiconductor Manufacturing Limited 10 Preliminary Datasheet EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH AP3609 Mechanical Dimensions SOIC-16 Unit: mm(inch) D D1 7° 0.310(0.012) 0.510(0.020) 7° B A 20:1 0.250(0.010) 0.400(0. 016) 1.270(0.050) BSC 9.800(0.386) 10.200(0.402) 1.270(0. 050) 0° 8° R 0.070(0. 003) 0.200(0.008) R 0.070(0.003) 0.200(0.008) B 20:1 8° C 3° 7° 0.200(0.008) Sφ1.000(0. 039) Depth 0.200(0.008) 8° A 0.150(0. 006) ×45 ° 0.400(0. 016) 8° C-C 50:1 1.000(0.039) 0.170(0.007) 0.250(0.010) 3.800(0.150) 4.040(0.159) 9.5 ° 0.200(0.008) 0.250(0.010) 0.050(0.002) 0.250(0.010) 5.800(0. 228) 6.240(0. 246) C Note: Eject hole, oriented hole and mold mark is optional. D Symbol D1 min(mm) max(mm) min(inch) max(inch) min(mm) max(mm) min(inch) max(inch) Option1 1.350 1.750 0.053 0.069 1.250 Option2 - 1.260 - 0.050 1.020 May 2013 Rev. 2. 0 . 1.650 0.049 0.065 - 0.040 - BCD Semiconductor Manufacturing Limited 11 Preliminary Datasheet EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH AP3609 Mounting Pad Layout SOIC-16 Z G Y X Dimensions Value Z (mm)/(inch) 6.900/0.272 E G (mm)/(inch) 3.900/0.154 X (mm)/(inch) 0.650/0.026 May 2013 Rev. 2. 0 Y (mm)/(inch) 1.500/0.059 E (mm)/(inch) 1.270/0.050 BCD Semiconductor Manufacturing Limited 12 BCD Semiconductor Manufacturing Limited http://www.bcdsemi.com IMPORTANT NOTICE BCD Semiconductor Manufacturing Limited reserves the right to make changes without further notice to any products or specifications herein. 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