FA7630CP

FA7630CP(E) FA7630CP(E) s Description The FA7630CP(E) is dual channel PWM-type switching power supply control IC. This IC can drive Pch-MOSFET directly and is optimum for large power DC-DC converter. This IC has all the necessary protection functions for a power MOSFET. It is optimum for a portable equipment power supply which uses low-voltage input to output comparably large power. Bipolar IC For Switching Power Supply Control s Dimensions, mm SSOP-20 20 11 s Features • Dual channel PWM-type switching power supply control • ±2.6% (VREF) and ±3% (VB ) reference voltage • Low voltage operation (Vcc: 5 to 20V) • Drive circuit for connecting a Pch-MOSFET • Overload cutoff circuit with timer latch circuit • Soft start circuit • Undervoltage lockout function (UVLO) • Pulse-by-pulse overcurrent limiting function • Output ON/OFF control function for each channel • Master-slave synchronized operation without external components • Maximum operating frequency is 500kHz 0.1±0.1 7.2 +0.1 0.2 –0.05 1 10 5.3 7.9±0.3 0~10˚ 0.6 0.3 0.65 DIP-20 20 11 1 0.77 24.4 10 1.52 2.54min 5.1max 3.6 0.51min 6.4 2.1max 0.25 +0.1 5 –0.0 7.62 ˚ 5˚ 0~1 2.54±0.25 0.46±0.1 0~15 s Block diagram Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Pin symbol Description Oscillator timing capacitor Oscillator timing resistor CT RT ON/OFF2 Output ON/OFF control 2 IN2+ Non-inverting input to error amplifier IN2– FB2 DT2 OCL2 GND OUT2 OUT1 VCC OCL1 DT1 FB1 IN1+ Inverting input to error amplifier Error amplifier output Dead time adjustment Overcurrent limiting circuit 2 Ground CH.2 output CH.1 output Power supply Overcurrent limiting circuit Dead time adjustment Error amplifier output Non-inverting input to error amplifier ON/OFF1 Output ON/OFF control 1 SYNC IN CP REF Synchronizing signal input Timer and latch circuit Reference voltage output 1 FA7630CP(E) s Absolute maximum ratings Item Maximum supply voltage Maximum output current Maximum power dissipation Junction temperature Operating temperature Storage temperature Symbol Rating 22 ±500 650 125 –20 to +85 –40 to +150 Unit V mA mW °C °C °C s Recommended operating conditions Item Supply voltage Feedback resistance Oscillator timing capacitance Oscillator timing resistance Oscillation frequency Symbol Min. 5 100 50 24 50 2200 100 500 Max. 20 Unit V kΩ pF kΩ kHz VCC IOUT Pd TJ Topr Tstg VCC RNF CT RT fOSC s Electrical characteristics (Ta=25°C, VCC=6V, CT=180pF, RT=47kΩ ) Reference voltage section Item Output voltage Line regulation Symbol Test condition Min. 2.450 Typ. 2.520 5 Max. 2.580 20 Unit V mV VREF LINE LOAD VTC1 VTC2 IOR = 1mA VCC = 5.0 to 20V IOR=1mA IOR = 0.1 to 1mA Ta = –20 to +25°C Ta = +25 to +85° C Load regulation Output voltage variation due to temperature change 30 –1 –1 50 1 1 mV % % Oscillation and synchronizing circuit section Item Oscillation frequency Frequency variation(due to supply voltage change) Frequency variation(due to temperature change) H level of synchronizing signal L level of synchronizing signal Cutoff level of synchronizing signal Bias current of synchronizing signal Symbol Test condition Min. 74 Typ. 83 1 5 1.5 0.8 1.8 1.1 0.4 5 Max. 92 Unit kHz % % V V V µA fOSC fdV fdT VSYH VSYL VSD ISYNC CT=180pF, RT=47k Ω VCC = 3.6 to 20V Ta = –20 to +85°C VSYNC=1.6V Error amplifier section (Ch.1) Item Reference voltage Input bias current Open-loop voltage gain Unity-gain bandwidth H state output voltage L state output voltage Output source current Symbol Test condition Min. 0.769 Typ. 0.793 5 60 1 No load No load 2.10 300 40 55 100 Max. 0.817 100 Unit V nA dB MHz V mV µA VB IB AVO fT VOH VOL IOH VOH=1V Error amplifier section (Ch.2) Item Input offset voltage Input bias current Common-mode input voltage Open-loop voltage gain Unity-gain bandwidth H state output voltage L state output voltage Output source current Symbol Test condition Min. Typ. 2 5 0 70 1.0 No load No load 2.10 300 50 65 200 Max. 10 100 1.0 Unit mV nA V dB MHz V mV µA VIO IB VCOM AVO fT VOH VOL IOH VOH=1V 2 FA7630CP(E) Pulse width modulation circuit section (FB pin) Item Input threshold voltage Input threshold voltage Symbol Test condition Duty cycle = 0% Duty cycle = 100% Min. Typ. 1.65 0.95 Max. Unit V V VTHO VTH1 Dead time adjustment circuit section (DT pin) Item Input threshold voltage Input threshold voltage Standby voltage Symbol Test condition Duty cycle = 0% Duty cycle = 100% DT pin open 1.80 Min. Typ. 1.65 0.95 Max. Unit V V V VTHO VTH1 VSTB Overcurrent limiting circuit section Item Input threshold voltage Hysteresis voltage Input bias current Delay in OCL Symbol Test condition Min. 175 Typ. 200 40 45 Overdriving : 50mV 120 80 Max. 225 Unit mV mV µA ns VTHOC VHYOC IOC tdoc Timer and latch circuit section Item Latch-mode threshold voltage Input bias current CP pin voltage / LOW Symbol Test condition Min. 1.00 Typ. 1.25 Max. 1.50 1 300 Unit V µA mV VTHCP IINCP VSATC VCP =1.5V, VFB=0.3V ICP =20µA, VFB=1.0V Output ON/OFF control section Item OFF-to-ON threshold voltage ON-to-OFF threshold voltage Input bias current Symbol Test condition Min. 0.60 Typ. Max. 3.0 Unit V V 230 350 µA VTHON VTHOF IIN VIN =3V Undervoltage lock-out circuit section Item OFF-to-ON threshold voltage ON-to-OFF threshold voltage Voltage hysteresis Symbol Test condition Min. 3.92 Typ. 4.20 3.50 0.70 Max. 4.48 Unit V V V VCCON VCCOF VHYS Output section Item Saturation voltage(H level) Saturation voltage(L level) Symbol Test condition Min. Typ. 1.60 1.40 Max. 2.00 1.80 Unit V V VSAT+ VSAT– IO= –50mA IO= 50mA Overall device Item Standby supply current Operating-state supply current Symbol Test condition Out pin open Single channel operation Duty cycle =50% Min. Typ. 0.1 2.20 Max. 10 3.20 Unit µA mA ICCST ICC1 ICC2 Dual channel operation Duty cycle =50% 3.00 4.20 mA 3 FA7630CP(E) s Application circuit Individual application circuit 4 FA7630CP(E) Master-slave application circuit 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