Document
HA16114P/PJ/FP/FPJ, HA16120FP/FPJ
Switching Regulator for Chopper Type DC/DC Converter
Description
The HA16114P/FP/FPJ and HA16120FP/FPJ are single-channel PWM switching regulator controller ICs suitable for chopper-type DC/DC converters. Integrated totem-pole output circuits enable these ICs to drive the gate of a power MOSFET directly. The output logic of the HA16120 is designed to control a DC/DC step-up (boost) converter using an N-channel power MOS FET. The output logic of the HA16114 is designed to control a DC/DC step-down (buck) converter or inverting converter using a P-channel power MOS FET. These ICs can operate synchronously with external pulse, a feature that makes them ideal for power supplies that use a primary-control AC/DC converter to convert commercial AC power to DC, then use one or more DC/DC converters on the secondary side to obtain multiple DC outputs. Synchronization is with the falling edge of the ‘sync’ pulse, which can be the secondary output pulse from a flyback transformer. Synchronization eliminates the beat interference that can arise from different operating frequencies of the AC/DC and DC/DC converters, and reduces harmonic noise. Synchronization with an AC/DC converter using a forward transformer is also possible, by inverting the ‘sync’ pulse. Overcurrent protection features include a pulse-by-pulse current limiter that can reduce the width of individual PWM pulses, and an intermittent operating mode controlled by an on-off timer. Unlike the conventional latched shutdown function, the intermittent operating function turns the IC on and off at controlled intervals when pulse-by-pulse current limiting continues for a programmable time. This results in sharp vertical settling characteristics. Output recovers automatically when the overcurrent condition subsides. Using these ICs, a compact, highly efficient DC/DC converter can be designed easily, with a reduced number of external components.
Functions
• • • • • • 2.5 V voltage reference Sawtooth oscillator (Triangle wave) Overcurrent detection External synchronous input Totem-pole output Undervoltage lockout (UVL)
HA16114P/PJ/FP/FPJ, HA16120FP/FPJ
• Error amplifier • Vref overvoltage protection (OVP)
Features
• Wide supply voltage range: 3.9 V to 40 V* • Maximum operating frequency: 600 kHz • Able to drive a power MOS FET (±1 A maximum peak current) by the built-in totem-pole gate predriver circuit • Can operate in synchronization with an external pulse signal, or with another controller IC • Pulse-by-pulse overcurrent limiting (OCL) • Intermittent operation under continuous overcurrent • Low quiescent current drain when shut off by grounding the ON/OFF pin HA16114: IOFF = 10 µA (max) HA16120: IOFF = 150 µA (max) • Externally trimmable reference voltage (Vref): ±0.2 V • Externally adjustable undervoltage lockout points (with respect to VIN) • Stable oscillator frequency • Soft start and quick shut function Note: The reference voltage 2.5 V is under the condition of VIN ≥ 4.5 V.
Ordering Information
Hitachi Control ICs for Chopper-Type DC/DC Converters
Product Channels Dual Number HA17451 Channel No. Ch 1 Ch 2 Single HA16114 HA16120 Dual HA16116 — — Ch 1 Ch 2 HA16121 Ch 1 Ch 2 Control Functions Step-Up r r — r — — — r Step-Down r r r — r r r — Inverting r r r — r — r — Totem pole power MOS FET driver Pulse-by-pulse current limiter and intermittent operation by on/off timer Output Circuits Open collector Overcurrent Protection SCP with timer (latch)
2
HA16114P/PJ/FP/FPJ, HA16120FP/FPJ
Pin Arrangement
GND*1 SYNC RT CT IN(−) E/O IN(+) P.GND*1
1 2 3 4 5 6 7 8 (Top view)
16 15 14 13 12 11 10 9
Vref ADJ DB ON/OFF TM CL(−) VIN OUT
Note: 1. Pin 1 (GND) and Pin 8 (P.GND) must be connected each other with external wire.
Pin Description
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Symbol GND SYNC RT CT IN(–) E/O IN(+) P.GND OUT VIN CL(–) TM ON/OFF DB ADJ Vref Function Signal ground External sync signal input (synchronized with falling edge) Oscillator timing resistor connection (bias current control) Oscillator timing capacitor connection (sawtooth voltage output) Inverting input to error amplifier Error amplifier output Non-inverting input to error amplifier Power ground Output (pulse output to gate of power MOS FET) Power supply input Inverting input to current limiter Timer setting for intermittent shutdown when overcurrent is detected (sinks timer transistor current) IC on/off control (off below approximately 0.7 V) Dead-band duty cycle control input Reference voltage (Vref) adjustment input 2.5 V reference voltage output
3
HA16114P/PJ/FP/FPJ, HA16120FP/FPJ
Block Diagram
Vref 16 ADJ 15 DB 14 ON/OFF 13 TM 12 CL(−) 11 VIN 10 OUT 9
ADJ
VIN ON/OFF from UVL UVL H L VL VH OVP Triangle waveform generator
1.6 V 1.0 V
1k 0.3V
−
0.2 V
+
CL Vref
2.5V bandgap reference voltage generator
UVL output
Latch
S Q R
PWM COMP
+ − +
from UVL OUT
VIN
*1 NAND (HA16114)
0.3 V Latch reset pulses 1.1 V RT Bias current 1 GND 2 SY.