ChipFind - документация

Электронный компонент: HA16114P

Скачать:  PDF   ZIP
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
2
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
A (max)
HA16120: I
OFF
= 150
A (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
Channel
Control Functions
Overcurrent
Channels
Number
No.
Step-Up
Step-Down
Inverting
Output Circuits
Protection
Dual
HA17451
Ch 1
r
r
r
Open collector
SCP with timer (latch)
Ch 2
r
r
r
Single
HA16114
--
--
r
r
Totem pole
Pulse-by-pulse
HA16120
--
r
--
--
power MOS FET
current limiter and
Dual
HA16116
Ch 1
--
r
r
driver
intermittent operation
Ch 2
--
r
--
by on/off timer
HA16121
Ch 1
--
r
r
Ch 2
r
--
--
HA16114P/PJ/FP/FPJ, HA16120FP/FPJ
3
Pin Arrangement
(Top view)
1
16
Note: 1. Pin 1 (GND) and Pin 8 (P.GND) must be connected each other with external wire.
2
15
3
14
4
13
5
12
6
11
7
10
8
Vref
ADJ
DB
ON/OFF
TM
CL(
-
)
V
IN
OUT
9
GND*
1
SYNC
R
T
C
T
IN(
-
)
E/O
IN(+)
P.GND*
1
Pin Description
Pin No.
Symbol
Function
1
GND
Signal ground
2
SYNC
External sync signal input (synchronized with falling edge)
3
R
T
Oscillator timing resistor connection (bias current control)
4
C
T
Oscillator timing capacitor connection (sawtooth voltage output)
5
IN()
Inverting input to error amplifier
6
E/O
Error amplifier output
7
IN(+)
Non-inverting input to error amplifier
8
P.GND
Power ground
9
OUT
Output (pulse output to gate of power MOS FET)
10
V
IN
Power supply input
11
CL()
Inverting input to current limiter
12
TM
Timer setting for intermittent shutdown when overcurrent is detected (sinks
timer transistor current)
13
ON/
OFF
IC on/off control (off below approximately 0.7 V)
14
DB
Dead-band duty cycle control input
15
ADJ
Reference voltage (Vref) adjustment input
16
Vref
2.5 V reference voltage output
HA16114P/PJ/FP/FPJ, HA16120FP/FPJ
4
Block Diagram
UVL
H
L
V
L
V
H
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
Vref
ADJ
DB
ON/OFF
TM
CL(
-
)
V
IN
OUT
SYNC
R
C
IN(
-
)
E/O
IN(+)
P.GND
T
T
1.1 V
R
T
+
-
+
NAND (HA16114)
-
+
0.2 V
from
UVL
1k
1k
0.3V
ON/OFF
ADJ
V
IN
Vref
PWM COMP
from
UVL
V
IN
1.6 V
1.0 V
from
UVL
OUT
Latch
S
R
Q
OVP
+
-
*
1
2.5V
bandgap
reference
voltage
generator
UVL
output
Triangle waveform
generator
Latch reset pulses
Bias
current
EA
CL
0.3 V
GND
Note: 1. The HA16120 has an AND gate.
HA16114P/PJ/FP/FPJ, HA16120FP/FPJ
5
Timing Waveforms
T =
1
OSC
1.6 V typ
1.0 V
typ
V
0 V
IN
V
0 V
IN
Off
Off
Off
Off
On
On
On
On
On
Off
Off
Off
Off
Off
On
On
On
On
On
Dead-band
voltage (at DB)
Sawtooth wave
(at C )
Off
Error amplifier
output (at E/O)
HA16114 PWM
pulse output
(drives gate of
P-channel
power MOS FET)
HA16120 PWM
pulse output
(drives gate of
N-channel
power MOS FET)
Time t
Note: On duty =
t
ON
T
Generation of PWM pulse output from sawtooth wave (during steady-state operation)
T
f