HA16114P/PJ/FP/FPJ, HA16120FP/FPJ Switching Regulator for Chopper Type DC/DC Converter
REJ03F0055-0200Z
(Previous: ADE-204-020A)
Rev.2.0
Sep.18.2003 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 i
s 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)
•Error amplifier
•Vref overvoltage protection (OVP)
Features
• Wide supply voltage range: 3.9 V to 40 V*• Maximum operating frequency: 600 kHz
2013年广东高考作文• Able to drive a power MOS FET (±1 A maximum peak current) by the built-in totem-pole gate pre-driver 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: I OFF = 10 µA
(max)HA16120: I OFF = 150 µA (max)
• Externally trimmable reference voltage (Vref): ±0.2 V
• Externally adjustable undervoltage lockout points (with respect to V IN )• Stable oscillator frequency • Soft start and quick shut function中国
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Note:The reference voltage 2.5 V is under the condition of V IN ≥ 4.5 V.
Ordering Information
Hitachi Control ICs for Chopper-Type DC/DC Converters
Control Functions Channels Product
Number Channel No.Step-Up Step-Down Inverting Output Circuits Overcurrent Protection
HA17451Ch 2
❍❍❍Open collector
SCP with timer (latch)
HA16114——❍❍Single
HA16120
—❍——Ch 1—❍❍HA16116
Ch 2
—❍—Ch 1—❍❍Dual
HA16121
Ch 2
❍
—
—
Totem pole
石碳酸power MOS FET driver
Pulse-by-pulse current limiter and intermittent operation by on/off timer
Pin Arrangement
Pin Description
Pin No.Symbol Function
1GND Signal ground
2SYNC External sync signal input (synchronized with falling edge)
Oscillator timing resistor connection (bias current control)
3R
T
4C
Oscillator timing capacitor connection (sawtooth voltage output) T
5IN(–)Inverting input to error amplifier
石家庄丽池ceo
会所6E/O Error amplifier output
7IN(+)Non-inverting input to error amplifier
8P.GND Power ground
9OUT Output (pulse output to gate of power MOS FET)
10V
Power supply input
IN
11CL(–)Inverting input to current limiter
12TM Timer setting for intermittent shutdown when overcurrent is detected
(sinks timer transistor current)
13ON/OFF IC on/off control (off below approximately 0.7 V)
14DB Dead-band duty cycle control input
15ADJ Reference voltage (Vref) adjustment input
16Vref 2.5 V reference voltage output
Block Diagram
Timing Waveforms
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