HA17451AFP Datasheet | Hitachi Semiconductor

Description The HA17451 is a dual-channel switching regulator controller IC. Each channel contains the basic circuits for controlling a PWM-type switching-regulator power supply. Both channels are integrated onto the same chip. Both channels can be pletely synchronized, using the same oscillator output waveform. Each channel can provide output voltages for step-up, step-down, inverting, and other converter topologies. These controllers operate at voltages from 3.3 V to 40 V, making them suitable for a wide range of applications. They are ideal for chopper-type DC/DC converters. They are similar to the TL1451, but note that the HA17451A differs from the TL1451A. Functions - - - - - - - Low-dropout 2.5V voltage reference Undervoltage lockout Triangle-wave oscillator Adjustable dead-time control Error amplifier Output driver (open-collector transistor type) PWM parator HA17451AP/HA17451AFP Features - - - - Low dropout voltage of on-chip 2.5V voltage reference: Vdrop = 0.2 V (typ) Operates throughout wide supply voltagerange: 3.3 V to 40 V Large maximum output current: 50 m A (max) Undervoltage lockout circuit High threshold voltage: 3.15 V (typ) Low threshold voltage: 2.98 V (typ) Low current drain: 1.5 m A (typ) Operates at wide range of oscillator frequencies: f OSC = 1 k Hz to 300 k Hz Dead time adjustable through full duty cycle range Surface-mount package (SOP16) for saving space (HA17451AFP) - - - - Ordering Information Type Name HA17451AP HA17451AFP Package DP-16 FP-16DA HA17451AP/HA17451AFP Pin Arrangement CT RT NON. INV. INPUT1 INV. INPUT1 FEED BACK1 D.T.C1 OUT1 GND 1 2 3 4 5 6 7 8 (Top view) 16 15 14 13 12 11 10 9 Vref S.C.P NON. INV. INPUT2 INV. INPUT2 FEED BACK2 D.T.C2 OUT2 V CC Pin Functions Pin No. 1 2 3, 14 4, 13 5, 12 6, 11 7, 10 8 9 15 16 Symbols CT RT NON. INV. INPUT INV. INPUT FEEDBACK D.T.C OUT GND VCC S.C.P Vref Functions Timing capacitor Timing resistor Non-inverting input of error amp Inverting input of error amp Output of error amp...