FA5301

FA5301BP FUJI | Alldatasheet

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Technical content

FA5301BP(N) FA5301BP(N) n Description 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. n Features

• External synchronization input terminal
• Wide supply voltage range (V CC =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 n Applications
• Switching power supply for general equipment (Optimum for TV, display, and other monitor devices) n Dimensions, mm \ SOP-16 \ DIP-16 n Block diagram 16 9 819.4 6.5 7.6 3.4 4.3max 1.50.81 3.1min 0.2min 0.3 +0.1 –0.05 Bipolar IC For Switching Power Supply Control 1 8 916 0.65 0.33 0~8˚1.27–0.2 6.0–0.2 3.9–0.1 1.65–0.1 0.18–0.07 0.42–0.07 9.9–0.1 0.2 Pin Pin Description No. symbol

1 IN (–) Inverting input to error amplifier

2 IN (+) Non-inverting input to error

3 ER.OUT Error amplifier output

4 FB Feedback input

5 IS Overcurrent detection

6 CD Overcurrent cutoff delay

7 GND Ground

8 ON/OFF Output ON/OFF control

9 OUT Output

10 DT Dead time adjustment

11 CT Oscillator timing capacitor

12 CSY External synchronizing signal

13 SYNC External synchronization input

14 CSO PWM soft-start capacitor

15 REF Reference voltage output (5V)

16 VCC Power supply

FA5301BP(N) n Absolute maximum ratings Item Symbol Rating Unit VCC 22 V VO 22 V IOM 5m A VI 5V VIS 20 V VFB 20 V VON/OFF 6V VSYNC 6V Pd 1000 (DIP-16) *1 mW 400 (SOP-16) *2 Topr –20 to +85 °C Tstg –40 to +150 °C Supply voltage Output voltage Error amplifier output current Error amplifier input voltage Overcurrent detection terminal input voltage Feedback terminal input voltage Output ON/OFF terminal input voltage Synchronizing terminal input voltage Total power dissipation Operating temperature Storage temperature 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) n Recommended operating conditions Item Symbol Min. Max. Unit Supply voltage VCC 72 0 V Error amplifier input voltageVI 0 VREF -2 V Output current IO 20 mA Error amplifier feedback resistorR NF 33 k W Oscillator timing capacitorC T 100 10,000 pF Oscillator timing resistor R T 8.2 220 k W Free run oscillation frequencyfOSC 1 200 kHz Synchronized frequency fSYNC 1 200 kHz Frequency ratio CSY =OV –35 –5 % fOSC – fSYNC *3 fSYNC –30 +10 %CSY : Capacitor is connected to GND *3 Consider the tolerance offosc – fSYNC fSYNC n Electrical characteristics (Ta = 25°C, VCC = 9V, RT = 47kW , CT = 1000pF) Reference voltage section Item Symbol Test condition Min. Typ. Max. Unit Output voltage VREF IOR = 1mA 4.75 5.00 5.25 V Line regulation LINE VCC = 8 to 20V 10 25 mV Load current regulation LOAD IOR = 0.1 to 2mA 10 25 mV Output voltage variation by temperature fluctuationVTC1 Ta = –20 to +25°C1 % VTC2 Ta = +25 to +85°C1 % Output current at output short-circuit IOS 25 mA Oscillator section Item Symbol Test condition Min. Typ. Max. Unit Oscillation frequency fOSC C T = 1,000pF, R T = 47kW 20 21 22 kHz Frequency variation by line voltage fluctuation fdV VCC = 8 to 20V 2 % Frequency variation by temperature fluctuation fdt1 Ta = +25 to –20°C– 2 + 2 % fdt2 Ta = +25 to +85°C– 2 + 2 % Input current to synchronizing signal terminal ISYNC1 VSYNC = 1V 300 600 mA ISYNC2 VSYNC = –0.5V –60 –300 mA Input current to synchronizing signal detection terminalICSY1 Pin 12 = 0V, VSYNC = –0.5V –65 –130 –260 mA ICSY2 Pin 12 = 1V, VSYNC = 1V 200 400 mA Threshold voltage of synchronizing signal detection terminalVTH CSY 0.7 1.0 V Error amplifier section Item Symbol Test condition Min. Typ. Max. Unit Input offset voltage VIO –10 10 mV Input bias current II 1 mA Common-mode input voltage VCM 0 VREF –2 V Open-loop voltage gain AV 70 95 dB Unity-gain bandwidth G B 0.8 MHz Common-mode signal rejection ratio CMRR 80 dB Maximum output voltage VOM+ IOM = –50mA4 V VOM– IOM = 50mA 0.5 V Output sink current IOM– VOM = 1V 170 240 mA

FA5301BP(N) PWM comparator section Item Symbol Test condition Min. Typ. Max. Unit Input bias current (Pin 4) IBFB VFB = 1V –2.0 –10.0 mA Input threshold voltage (Pin 4) VTH0 Duty cycle = 0% 3.3 V VTH100 Duty cycle = 100% 0.2 V Soft-start signal pin input current ICSO Pin 14 = 3V, VFB = 0V 2.0 10.0 mA Dead time adjustment circuit section Item Symbol Test condition Min. Typ. Max. Unit Input bias current IBDT Pin 10 = 1V –0.5 –5 mA Input threshold voltage VTH DT0 Duty cycle = 0% 3.2 V VTH DT100 Duty cycle = 100% 0.1 V Reset saturation voltage VSAT RS Pin 10 = –100mA 0.25 0.8 V Overcurrent limiting circuit section Item Symbol Test condition Min. Typ. Max. Unit Input bias current (Pin 5) IBIS VIS = 0.3V –1 mA Input threshold voltage (Pin 5) VTH IS 0.5 0.6 0.7 V Source current of overcurrent cutoff terminal IO CD Pin 6 = 0V, VIS = 1V –450 –700 mA Latch-mode threshold voltage VTH LA 1.8 2.2 2.6 V Reset saturation voltage (Pin 6) VSAT RS Pin 6 = 100mA, VIS = 0V 0.75 1.0 V Output section Item Symbol Test condition Min. Typ. Max. Unit Output leakage current ILEAK VO = 22V, output OFF 10 mA L-level output voltage VOL IO = 10mA 0.4 0.7 V Output sink current limit ISINK VO = 3V 25 40 55 mA Output ON/OFF control circuit section Item Symbol Test condition Min. Typ. Max. Unit Input bias current (Pin 8) IBON Pin 8 = 0V –60 –300 mA OFF-to-ON threshold voltage VTH ON OFF fi ON 2.13 2.50 2.87 V ON-to-OFF threshold voltage VTH OFF ON fi OFF 1.96 2.30 2.64 V Voltage hysteresis VHYS 0.2 V Overall device Item Symbol Test condition Min. Typ. Max. Unit Supply current ICC LA R T = 47kW , latch mode 8.0 12.0 mA Operating-state supply current ICC AV R T = 47kW , duty cycle = 50% 6.5 9.8 mA

FA5301BP(N) n Characteristic curves (Ta = 25°C) Oscillation frequency (fOSC ) vs. timing Output duty cycle vs. DT terminal voltage (V DT ) resistor resistance (RT) 171 0 2 0 5 0 R T [kΩ ] 100 200 500 2200pF 1500pF 1000pF 680pF 470pF C T=100pF 100 fosc [kHz] 1000 500 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 (q)

FA5301BP(N) n Application circuit \` 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.