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PDF HA16120FPJ Data sheet ( Hoja de datos )
| Número de pieza | HA16120FPJ | |
| Descripción | Switching Regulator for Chopper Type DC/DC Converter | |
| Fabricantes | Hitachi Semiconductor | |
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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)
1 page  
Timing Waveforms
HA16114P/PJ/FP/FPJ, HA16120FP/FPJ
Generation of PWM pulse output from sawtooth wave (during steady-state operation)
Dead-band
voltage (at DB)
1.6 V typ
T=
1
fOSC
Sawtooth wave
(at CT)
Error amplifier
output (at E/O)
1.0 V
typ
HA16114 PWM
pulse output
(drives gate of
P-channel
power MOS FET)
VIN
0V
Off Off
On
Off
On
Off Off
On On On
HA16120 PWM
pulse output
(drives gate of
N-channel
power MOS FET)
VIN
0V
Note: On duty = tON
T
On
Off Off
On
Off
On On On
Off Off
Time t
5
5 Page 
HA16114P/PJ/FP/FPJ, HA16120FP/FPJ
3.2 Soft-Start Setting
Soft-start avoids overshoot at power-up by widening the PWM output pulses gradually, so that the
converted DC output rises slowly. Soft-start is programmed by connecting a capacitor between the DB pin
and ground. The soft-start time is determined by the time constant of this capacitor and the resistors that
set the voltage at the DB pin.
Note:
tsoft = −C1 × R × ln (1 −
VX )
VDB
R=
R1 × R2
R1 + R2
VDB
=
Vref
×
R2
R1 + R2
VX is the voltage at the DB pin after time t (VX < VDB).
Undervoltage
lockout released Sawtooth wave
Sawtooth
To Vref wave
−
PWM
VTH 1.6 V
COMP VDB
R1
E/O
+
VX DB
+
V TL
1.0 V
C1 R2
from
UVL
UVL sink
transistor
VX
Soft-start time
tsoft
t
Figure 3.2 Soft-Start Setting
3.3 Quick Shutdown
The quick shutdown function resets the voltages at all pins when the IC is turned off, to assure that PWM
pulse output stops quickly. Since the UVL pull-down resistor in the IC remains on even when the IC is
turned off, the sawtooth wave output, error amplifier output, and DB pin are all reset to low voltage.
This feature helps in particular to discharge capacitor C1 in figure 3.2, which has a comparatively large
capacitance. In intermittent mode (explained on a separate page), this feature enables the IC to soft-start in
each on-off cycle.
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet HA16120FPJ.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
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