Bipolar IC For Switching Power Supply Control FA5301BP(N) FA5301BP(N) ■ Description ■ Dimensions, mm The FA5301BP(N) is a bipolar IC containing basic circuits necessary for PWM-type switching power supply control. This IC switches an external transistor according to external synchronizing pulses. Á SOP-16 9 3.9±0.1 6.0±0.2 16 ■ Features 0.2 1.27±0.2 0.42±0.07 16 9 6.5 1 8 19.4 1.5 0.2min 3.4 0.81 0.5±0.1 2.54±0.25 +0.1 5 .0 0.3 –0 7.6 0~15 ˚ 5˚ 0~1 Pin No. Pin symbol Description 1 IN (–) IN (+) Inverting input to error amplifier 2 3 ER.OUT Error amplifier output 4 FB Feedback input 5 IS CD Overcurrent detection 6 7 GND Ground 8 ON/OFF Output ON/OFF control 9 OUT Output 10 Dead time adjustment 11 DT CT 12 CSY External synchronizing signal detection capacitor 13 SYNC External synchronization input 14 CSO PWM soft-start capacitor 15 REF VCC Reference voltage output (5V) 16 1 0.65 Á DIP-16 • Switching power supply for general equipment (Optimum for TV, display, and other monitor devices) ■ Block diagram 1.65±0.1 0.33 0~8˚ 9.9±0.1 3.1min 4.3max ■ Applications 8 1 0.18±0.07 • External synchronization input terminal • Wide supply voltage range (VCC =7 to 22V) • Open-collector output • Soft-start from standby mode • Double protection of output transistor by overcurrent limiting and cutoff functions • Output ON/OFF control function • Not many external discrete components needed Non-inverting input to error amplifier Overcurrent cutoff delay capacitor Oscillator timing capacitor Power supply FA5301BP(N) ■ Absolute maximum ratings ■ Recommended operating conditions Item Symbol Rating Unit Item Supply voltage VCC VO IOM 22 V Supply voltage 22 V 5 mA VI 5 V Output voltage Error amplifier output current Error amplifier input voltage Oscillator timing resistor VIS 20 V Feedback terminal input voltage VFB VON/OFF 20 V Synchronized frequency 6 V Frequency ratio Free run oscillation frequency Synchronizing terminal input voltage VSYNC 6 Total power dissipation Pd 1000 (DIP-16) *1 400 (SOP-16) Operating temperature Storage temperature Topr Tstg V fOSC – fSYNC * 3 fSYNC Capacitor is connected to GND mW *2 –20 to +85 °C –40 to +150 °C Min. Max. Unit 7 20 V 0 VREF-2 V 20 mA 33 CT RT fOSC fSYNC CSY=OV CSY: Oscillator timing capacitor Overcurrent detection terminal input voltage Output ON/OFF terminal input voltage Symbol VCC Error amplifier input voltage VI Output current IO Error amplifier feedback resistor RNF kΩ 100 10,000 pF 8.2 220 kΩ 1 200 kHz 1 200 kHz –35 –30 –5 % +10 % Notes: * 1 Derating factor Ta > 25°C : 10.0mW/°C (on PC board) * 2 Derating factor Ta > 25°C : 4.0mW/°C (on PC board) fosc – fSYNC * 3 Consider the tolerance of fSYNC ■ Electrical characteristics (Ta = 25°C, VCC = 9V, RT = 47kΩ, CT = 1000pF) Reference voltage section Item Symbol Test condition Min. Typ. Max. Unit Output voltage VREF LINE LOAD IOR = 1mA VCC = 8 to 20V IOR = 0.1 to 2mA 4.75 5.00 5.25 V VTC1 VTC2 IOS Ta = –20 to +25°C Ta = +25 to +85°C Item Symbol Test condition Min. Typ. Oscillation frequency fOSC fdV fdt1 fdt2 ISYNC1 CT = 1,000pF, RT = 47kΩ VCC = 8 to 20V Ta = +25 to –20°C Ta = +25 to +85°C VSYNC = 1V 20 21 ISYNC2 ICSY1 ICSY2 VTH CSY VSYNC = –0.5V Pin 12 = 0V, VSYNC = –0.5V –65 Pin 12 = 1V, VSYNC = 1V Item Symbol Test condition Input offset voltage VIO II VCM AV Line regulation Load current regulation Output voltage variation by temperature fluctuation Output current at output short-circuit 10 25 mV 10 25 mV 1 % 1 % 25 mA Oscillator section Frequency variation by line voltage fluctuation Frequency variation by temperature fluctuation Input current to synchronizing signal terminal Input current to synchronizing signal detection terminal Threshold voltage of synchronizing signal detection terminal –2 –2 300 Max. Unit 22 kHz 2 % +2 % +2 % 600 µA –60 –300 µA –130 –260 µA 200 400 µA 0.7 1.0 V Error amplifier section Input bias current Common-mode input voltage Open-loop voltage gain Unity-gain bandwidth Common-mode signal rejection ratio Maximum output voltage Output sink current GB CMRR VOM+ VOM– IOM– Min. Typ. –10 IOM = –50µA IOM = 50µA VOM = 1V Unit mV 1 µA VREF–2 V 0 70 Max. 10 95 dB 0.8 MHz 80 dB 4 V 0.5 170 240 V µA 2 FA5301BP(N) PWM comparator section Item Symbol Test condition Input bias current (Pin 4) IBFB VTH0 VTH100 ICSO VFB = 1V Item Symbol Test condition Input bias current Pin 10 = 1V Input threshold voltage IBDT VTH DT0 VTH DT100 Duty cycle = 0% 3.2 Duty cycle = 100% 0.1 Reset saturation voltage VSAT RS Pin 10 = –100 µA 0.25 0.8 V Item Symbol Test condition Typ. Max. Unit Input bias current (Pin 5) IBIS VTH IS VIS = 0.3V –1 µA 0.6 0.7 V IO CD VTH LA VSAT RS Pin 6 = 0V, VIS = 1V –450 –700 µA Item Symbol Test condition Output leakage current ILEAK VOL ISINK VO = 22V, output OFF IO = 10mA VO = 3V 25 Item Symbol Test condition Input bias current (Pin 8) IBON VTH ON VTH OFF VHYS Pin 8 = 0V Item Symbol Test condition Supply current ICC LA ICC AV RT = 47kΩ, latch mode RT = 47kΩ, duty cycle = 50% Input threshold voltage (Pin 4) Soft-start signal pin input current Min. Typ. Max. Unit –2.0 –10.0 µA Duty cycle = 0% 3.3 V Duty cycle = 100% 0.2 V Pin 14 = 3V, VFB = 0V 2.0 10.0 µA Typ. Max. Unit –0.5 –5 Dead time adjustment circuit section Min. µA V V Overcurrent limiting circuit section Input threshold voltage (Pin 5) Source current of overcurrent cutoff terminal Latch-mode threshold voltage Reset saturation voltage (Pin 6) Min. 0.5 1.8 2.2 2.6 V 0.75 1.0 V Typ. Max. Unit 10 µA 0.4 0.7 V 40 55 mA Min. Typ. Max. Unit –60 –300 µA OFF→ON 2.13 2.50 2.87 V ON→OFF 1.96 2.30 2.64 V Pin 6 = 100 µA, VIS = 0V Output section L-level output voltage Output sink current limit Min. Output ON/OFF control circuit section OFF-to-ON threshold voltage ON-to-OFF threshold voltage Voltage hysteresis 0.2 V Overall device Operating-state supply current 3 Min. Typ. Max. Unit 8.0 12.0 mA 6.5 9.8 mA FA5301BP(N) ■ Characteristic curves (Ta = 25°C) Oscillation frequency (fOSC ) vs. timing resistor resistance (R T) Output duty cycle vs. DT terminal voltage (VDT) 1000 500 CT=100pF fosc [kHz] 100 50 10 470pF 680pF 1000pF 1500pF 2200pF 5 1 7 10 20 50 100 200 500 RT [kΩ] Output duty cycle vs. FB terminal voltage (VFB) L-level output voltage vs. output sink current (ISINK) Supply current (ICC ) vs. supply voltage (VCC) Error amplifier frequency (f) vs.voltage gain(Av)/ phase (θ) 4 FA5301BP(N) ■ Application circuit Á Switching power supply (primary current control and insulated output type) This circuit uses the following functions. • Horizontal synchronizing function • Overcurrent limiting function • Overcurrent cutoff function • Undervoltage input cutoff function • Soft-start function Parts tolerances characteristics are not defined in the circuit design sample shown above. When designing an actual circuit for a product, you must determine parts tolerances and characteristics for safe and economical operation. 5