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| FA3635P s Description FA3635P is a CMOS IC which includes low on-resistance power MOSFET for PWM-type switching power supply control. This IC achieves high efficiency DC-DC converter and it is suitable for buck converter or inverting converter with high input voltage of 10V to 50V. CMOS IC For Switching Power Supply Control FA3635P s Dimensions, mm DIP-8 8 5 s Features * Built-in low on-resistance Pch power MOSFET 50V/1.1(typ.)/1A(peak) * Wide range of 10V to 50V for input voltage * 1.2mA low operating current as a Power IC * Latch-mode short-circuit protection function * Built-in over-temperature protection Tj =125C (min.) 1 9.4 1.5 4 4.5max 3.1min 3.4 6.5 0.25 7.6 +0.1 5 -0.0 s Applications * Power supply for general equipment 2.540.25 0.50.1 0~15 0~1 5 s Block diagram Pin No. 1 2 3 4 5 6 7 8 Pin symbol Description Power supply Error amplifier output Inverting input to error amplifier Ground Ground Reference voltage Capacitor for soft-start Output VCC FB IN GND GND REF CS OUT 117 FA3635P s Absolute maximum ratings Item Supply voltage Error amplifier input voltage Total Power dissipation (Ta = 25C) Junction temperature Operating temperature Storage temperature Symbol Rating 50.0 5.5 1.1 125 -20 to +85C -40 to +150 Unit V V W C C C s Recommended operating conditions Item Supply voltage REF terminal by-pass capacitor VCC terminal by-pass capacitor Symbol Min. 10.0 470 Max. 45.0 Unit V F F VCC VIN Pd Tj Top Tstg VCC CREF CO 0.047 0.22 s Electrical characteristics (Ta=25C, VCC=44V, CREF=0.1F) Reference voltage section Item terminal Voltage Symbol Test condition Min. 3.00 Typ. 3.12 Max. 3.24 Unit V VREG CREF=0.1F Oscillator section Item Oscillation frequency Frequency change with supply voltage Frequency change with temperature Symbol Test condition Min. 70 Typ. 81 1 3 Max. 100 3 5 Unit kHz % % fOSC fdV fdT VCC=10 to 45V Ta=-20 to +85C Error amplifier section Item Input common mode voltage range Open-loop gain Unity-gain bandwidth Output sink current Output source current Symbol Test condition Min. 0.2 55 1.0 Voltage follower 3.0 3.8 -140 -100 Typ. Max. 2.5 Unit V dB MHz mA A V VICOM AVOL fT IFBL IFBH Vref VFB=Vref+0.05V Voltage follower VFB=Vref-0.05V Reference Voltage Voltage follower 0.97 1.00 1.03 VCC=10 to 45V Ta=-20 to +85C Input threshold voltage (Pin 2) VFB 0 VFB 100 Duty cycle=0% Duty cycle=100% 0.5 2.3 0.6 2.5 0.7 2.7 V V Soft-start circuit section Item Input threshold voltage (Pin 7) Charge current Symbol Test condition Duty cycle=0% Duty cycle=100% Min. 0.5 2.3 -2.8 Typ. 0.6 2.5 -2.2 Max. 0.7 2.7 -1.6 Unit V V A VCS 0 VCS 100 ICS Undervoltage lockout circuit section Item Operating voltage Symbol Test condition Min. 5.0 Typ. 6.1 Max. 8.5 Unit V VUVLO 118 FA3635P Overheat protection section Item Operating temperature Hysteresis width Symbol Test condition Min. 125 45 Typ. 135 50 Max. 145 55 Unit C C TOH TOH Output section Item Voltage drop Symbol Test condition Min. Typ. 1.1 0.7 0.1 1.0 1.75 Max. 1.4 0.9 0.2 2.0 A Unit V VDROP IOUT=1.0A IOUT=0.7A IOUT=0.1A Peak current Overcurrent limit IOLMT Overall device Item Operating current Symbol Test condition Out pin open, VCC=44V Duty cycle=100% Min. Typ. 0.9 Max. 4.0 Unit mA ICC s Characteristic curve Thermal characteristic 1.6 1.4 1.2 LOSS [W] 1 0.8 0.6 0.4 0.2 0 0 50 100 150 Ambient temperature [C] Thermal resistance : j-c(Junction to case) = 30C/W j-a(Junction to air) = 90C/W 119 FA3635P s Characteristic curves (Ta=25C) Output duty cycle vs. FB terminal voltage (VFB) 100 90 80 Output duty cycle vs. CS terminal voltage (VCS) 100 90 80 Output duty cycle [%] 70 60 50 40 30 20 10 0 0 0.5 1 1.5 2 2.5 3 Output duty cycle [%] 70 60 50 40 30 20 10 0 0 0.5 1 1.5 2 2.5 3 VFB [V] VCS [V] Oscillation frequency (fOSC) vs. ambient temperature (Ta) 100 Reference voltage (VREF) vs. ambient temperature (Ta) 1.05 95 1.04 1.03 90 fosc [kHz] 85 VREF [V] 1.02 1.01 1 0.99 80 75 0.98 70 20 0.97 20 0 20 40 60 80 100 0 20 40 60 80 100 Ta [C] Ta [C] Output voltage (VOUT) vs. output current (IOUT) Supply current (ICC) vs. supply voltage (VCC) 2 1.8 1.6 1.4 1.5 VCC- VOUT [V] 1 0.8 0.6 Icc [mA] 0.6 1 1.2 1 0.5 0.4 0.2 0 0 0.2 0.4 0.8 0 0 20 30 40 50 10 IOUT [A] Vcc [V] 120 FA3635P Error amplifier voltage gain (AV)/ phase () vs. frequency (f) Condition: Open loop 180 160 140 120 100 Phase 80 60 Voltage gain 40 20 0 - 20 - 40 10 100 1K 10K 100K 1M 10M Av [dB] [deg] [HZ] s 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. 121 |
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