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| FA5301BP(N) FA5301BP(N) s 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. Bipolar IC For Switching Power Supply Control s Dimensions, mm SOP-16 16 9 3.90.1 6.00.2 0.180.07 1 9.90.1 8 0.33 1.650.1 0.65 .0 0.3 -0 +0.1 5 s Features * 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 0.420.07 1.270.2 DIP-16 16 9 s Applications * Switching power supply for general equipment (Optimum for TV, display, and other monitor devices) 1 0.81 19.4 1.5 8 3.1min 4.3max 0.2min 3.4 6.5 0~8 0.2 7.6 2.540.25 0.50.1 0~15 0~1 5 s Block diagram Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Pin symbol Description Inverting input to error amplifier Non-inverting input to error amplifier Error amplifier output Feedback input Overcurrent detection Overcurrent cutoff delay capacitor Ground Output ON/OFF control Output Dead time adjustment Oscillator timing capacitor External synchronizing signal detection capacitor External synchronization input PWM soft-start capacitor Reference voltage output (5V) Power supply IN (-) IN (+) ER.OUT FB IS CD GND ON/OFF OUT DT CT CSY SYNC CSO REF VCC 1 FA5301BP(N) s Absolute maximum ratings Item 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 Symbol Rating 22 22 5 5 20 20 6 6 1000 (DIP-16) *1 400 (SOP-16) *2 C C Unit V V mA V V V V V mW s Recommended operating conditions Item Supply voltage Symbol Min. 7 0 33 100 8.2 1 1 -35 -30 10,000 220 200 200 -5 +10 Max. 20 Unit V V mA k pF k kHz kHz % % VCC VO IOM VI VIS VFB VON/OFF VSYNC Pd Topr Tstg VCC Error amplifier input voltage VI Output current IO Error amplifier feedback resistor RNF Oscillator timing capacitor Oscillator timing resistor Free run oscillation frequency Synchronized frequency Frequency ratio VREF-2 20 fOSC - fSYNC * 3 fSYNC CT RT fOSC fSYNC CSY=OV CSY: Capacitor is connected to GND -20 to +85 -40 to +150 Notes: * 1 Derating factor Ta > 25C : 10.0mW/C (on PC board) * 2 Derating factor Ta > 25C : 4.0mW/C (on PC board) fosc - fSYNC * 3 Consider the tolerance of fSYNC s Electrical characteristics (Ta = 25C, VCC = 9V, RT = 47k, CT = 1000pF) Reference voltage section Item Output voltage Line regulation Load current regulation Output voltage variation by temperature fluctuation Output current at output short-circuit Symbol Test condition Min. 4.75 Typ. 5.00 10 10 1 1 25 Max. 5.25 25 25 Unit V mV mV % % mA VREF LINE LOAD VTC1 VTC2 IOS IOR = 1mA VCC = 8 to 20V IOR = 0.1 to 2mA Ta = -20 to +25C Ta = +25 to +85C Oscillator section Item Oscillation frequency Frequency variation by line voltage fluctuation Frequency variation by temperature fluctuation Input current to synchronizing signal terminal Symbol Test condition Min. 20 -2 -2 300 -60 -130 200 0.7 Typ. 21 Max. 22 2 +2 +2 600 -300 -260 400 1.0 Unit kHz % % % fOSC fdV fdt1 fdt2 ISYNC1 ISYNC2 ICSY1 ICSY2 VTH CSY CT = 1,000pF, RT = 47k VCC = 8 to 20V Ta = +25 to -20C Ta = +25 to +85C VSYNC = 1V A A A A V Input current to synchronizing signal detection terminal Threshold voltage of synchronizing signal detection terminal VSYNC = -0.5V Pin 12 = 0V, VSYNC = -0.5V -65 Pin 12 = 1V, VSYNC = 1V Error amplifier section Item Input offset voltage 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 Symbol Test condition Min. -10 0 70 95 0.8 80 Typ. Max. 10 1 Unit mV VIO II VCM AV GB CMRR VOM+ VOM- IOM- A dB MHz dB V VREF-2 V IOM = -50A IOM = 50A VOM = 1V 4 0.5 170 240 V A 2 FA5301BP(N) PWM comparator section Item Input bias current (Pin 4) Input threshold voltage (Pin 4) Soft-start signal pin input current Symbol Test condition Min. Typ. -2.0 3.3 0.2 2.0 10.0 Max. -10.0 Unit IBFB VTH0 VTH100 ICSO VFB = 1V Duty cycle = 0% Duty cycle = 100% Pin 14 = 3V, VFB = 0V A V V A Dead time adjustment circuit section Item Input bias current Input threshold voltage Symbol Test condition Pin 10 = 1V Duty cycle = 0% Duty cycle = 100% Pin 10 = -100A Min. Typ. -0.5 3.2 0.1 0.25 0.8 Max. -5 Unit IBDT VTH DT0 VTH DT100 VSAT RS A V V V Reset saturation voltage Overcurrent limiting circuit section Item Input bias current (Pin 5) Input threshold voltage (Pin 5) Source current of overcurrent cutoff terminal Latch-mode threshold voltage Reset saturation voltage (Pin 6) Symbol Test condition Min. 0.5 Pin 6 = 0V, VIS = 1V 1.8 Pin 6 = 100A, VIS = 0V Typ. 0.6 -450 2.2 0.75 Max. -1 0.7 -700 2.6 1.0 Unit IBIS VTH IS IO CD VTH LA VSAT RS VIS = 0.3V A V A V V Output section Item Output leakage current L-level output voltage Output sink current limit Symbol Test condition Min. Typ. Max. 10 0.4 25 40 0.7 55 Unit ILEAK VOL ISINK VO = 22V, output OFF IO = 10mA VO = 3V A V mA Output ON/OFF control circuit section Item Input bias current (Pin 8) OFF-to-ON threshold voltage ON-to-OFF threshold voltage Voltage hysteresis Symbol Test condition Pin 8 = 0V OFFON ONOFF 2.13 1.96 Min. Typ. -60 2.50 2.30 0.2 Max. -300 2.87 2.64 Unit IBON VTH ON VTH OFF VHYS A V V V Overall device Item Supply current Operating-state supply current Symbol Test condition Min. Typ. 8.0 6.5 Max. 12.0 9.8 Unit mA mA ICC LA ICC AV RT = 47k, latch mode RT = 47k, duty cycle = 50% 3 FA5301BP(N) s Characteristic curves (Ta = 25C) Oscillation frequency (fOSC) vs. timing resistor resistance (RT) 1000 500 Output duty cycle vs. DT terminal voltage (VDT) 100 CT=100pF fosc [kHz] 50 10 5 470pF 680pF 1000pF 1500pF 2200pF 7 10 20 50 100 200 500 1 RT [k] 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 () 4 FA5301BP(N) s 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. 5 |
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