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 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
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
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
R
T
C
T
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(−)
V
IN
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
R
T
C
T
IN(–)
E/O
IN(+)
P.GND
OUT
V
IN
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
V
IN
10
OUT
9
ADJ
V
IN
ON/OFF from
UVL
UVL
H
L
V
L
V
H
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
V
IN
*1
NAND (HA16114)
0.3 V
Latch reset pulses
1.1 V
R
T
Bias
current
1
GND
2
SYNC
3
R
T
4
C
T
1k
from
UVL
+
−
EA
5
IN(−)
6
E/O
7
IN(+)
8
P.GND
Note: 1. The HA16120 has an AND gate.
4
HA16114P/PJ/FP/FPJ, HA16120FP/FPJ
Timing Waveforms
Generation of PWM pulse output from sawtooth wave (during steady-state operation)
T=
Dead-band
voltage (at DB)
1.6 V typ
1
f
OSC
Sawtooth wave
(at C
T
)
Error amplifier
output (at E/O)
1.0 V
typ
HA16114 PWM
pulse output
(drives gate of
P-channel
power MOS FET)
V
IN
Off
On
Off
On
Off
On
Off
On
Off
On
0V
HA16120 PWM
pulse output
(drives gate of
N-channel
power MOS FET)
V
IN
On
Off
Off
On
Off
On
Off
On
Off
On
0V
t
ON
T
Time t
Note: On duty =
5
京公网安备 11010802033920号
EEWORLD
