General Description The is a high performance AC/DC power supply controller for battery charger and adapter applications. The device uses Pulse Frequency Modulation (PFM) method to build discontinuous conduction mode (DCM) flyback power supplies. The provides accurate constant voltage, constant current (CV/CC) regulation while removing the opto-coupler and secondary control circuitry. It also eliminates the need of loop compensation circuitry while maintaining stability. The achieves excellent regulation and high average efficiency, yet meets the requirement for no-load consumption less than 30mW. The is available in SOT-23- package. Features Primary Side Control for Rectangular Constant Current and Constant Voltage Output Sub-microampere Start-up Current 30mW No-load Input Power Feasible Tight CV Regulation Performance Eliminates Opto-coupler and Secondary CV/CC Control Circuitry Eliminates Control Loop Compensation Circuitry Flyback Topology in DCM Operation Random Frequency Modulation to Reduce System EMI Built-in Soft Start Open Feedback Protection Short Circuit Protection SOT-23- Package Applications Adapters/Chargers for Cell/Cordless Phones, PDAs, MP3 and Other Portable Apparatus LED Drivers Standby and Auxiliary Power Supplies SOT-23- Figure 1. Package Type of 1
Pin Configuration K Package (SOT-23-) Pin 1 Dot by Marking OUT 1 FB GND 2 5 GND VCC 3 4 CS Figure 2. Pin Configuration of (Top View) Pin Description Pin Number Pin Name Function 1 OUT This pin drives the base of external power NPN switch 2, 5 GND Ground 3 VCC Supply voltage 4 CS The primary current sense FB The voltage feedback from the auxiliary winding 2
Functional Block Diagram VCC 3 FB 0.1V COMP pfm Tonsec Detector Tons Regulator & Bias UVLO EA OCkP 4.0V Constant Voltage Control R Q CV_ctrl pfm Driver 1 OUT S CS 4 Peak Current Control & LEB Tons Constant Current Control R Q CC_ctrl 2, 5 GND S Figure 3. Functional Block Diagram of 3
Ordering Information - Circuit Type Package K: SOT-23- G1: Green TR: Tape and Reel Package Temperature Range Part Number Marking ID Packing Type SOT-23- -40 to 85 o C KTR-G1 GBB Tape & Reel BCD Semiconductor's products, as designated with "G1" suffix in the part number, are RoHS compliant and Green. Absolute Maximum Ratings (Note 1) Parameter Value Unit Supply Voltage VCC -0.3 to 3 V Voltage at CS, OUT to GND -0.3 to 7 V FB Input -40 to 10 V Output Current at OUT Internally limited A Operating Junction Temperature 150 o C Storage Temperature -5 to 150 o C Lead Temperature (Soldering, 10s) 300 o C Thermal Resistance Junction-to-Ambient 250 o C/W ESD (Machine Model) 200 V ESD (Human Body Model) 2000 V 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. 4
Electrical Characteristics (V CC =15V, T A =25 o C, unless otherwise specified.) Parameter Symbol Conditions Min Typ Max Unit UVLO SECTION Start-up Threshold V TH (ST) 1 18.5 21 V Minimal Operating Voltage V OPR (min) 7.2 9 10.2 V STANDBY CURRENT SECTION Start-up Current I ST V CC = V TH (ST) -0.5V, Before start-up 0. µa Operating Current I CC(OPR) Static 200 320 µa DRIVE OUTPUT SECTION OUT Maximum Current Sink I OUT 50 ma Source 24 30 3 CURRENT SENSE SECTION Current Sense Threshold V CS 455 510 545 mv Pre-Current Sense V CS(PRE) 35 410 455 mv Leading Edge Blanking 750 ns FEEDBACK INPUT SECTION Feedback Pin Input Leakage Current I FB V FB =4V 2.0 2.5 3.1 µa Feedback Threshold V FB 3.89 3.95 4.01 V Over Voltage Protection V FB(OVP).4 8 9. V 5
Typical Performance Characteristics 21 10.5 Start-up Voltage (V) 20 19 18 17 Minimal Operating Voltage (V) 10.0 9.5 9.0 8.5 8.0 1-40 -20 0 20 40 0 80 100 120 7.5-40 -20 0 20 40 0 80 100 120 Ambient Temperature ( o C) Ambient Temperature ( o C) Figure 4. Start-up Voltage vs. Ambient Temperature Figure 5. Mininal Operating Voltage vs. Ambient Temperature 300 280 20 5 Operating Current (µa) 240 220 200 180 10 I FB (µa) 4 3 2 140 1 120 100-40 -20 0 20 40 0 80 100 120 0-40 -20 0 20 40 0 80 100 120 Ambient Temperature ( o C) Ambient Temperature ( o C) Figure. Operating Current vs. Ambient Temperature Figure 7. I FB vs. Ambient Temperature
Typical Application T1 D2 + C1 R1 R5 C3 C4 + + C2 D1 NVP Ns V O + R2 D3 V O - R3 VCC OUT Q1 R NVFB CS FB R4 GND R7 Rs Figure 8. 5V/700mA Output for Battery Charger of Mobile Phone 7
Mechanical Dimensions SOT-23- Unit: mm(inch) 2.820(0.111) 3.020(0.119) 0.300(0.012) 0.400(0.01) 0 8 0.200(0.008) 5 4 0.300(0.012) 0.00(0.024) 2.50(0.104) 2.950(0.11) Pin 1 Dot by Marking 1.500(0.059) 1.700(0.07) 1 2 3 0.700(0.028)REF 0.950(0.037)TYP 1.800(0.071) 2.000(0.079) 0.000(0.000) 0.150(0.00) 0.100(0.004) 0.200(0.008) 0.900(0.035) 1.300(0.051) 1.450(0.057) MAX 8
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