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Renesas Electronics Components Datasheet

M51996AFP Datasheet

SWITCHING REGULATOR CONTROL

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M51996AP/AFP
Switching Regulator Control
REJ03D0836-0201
Rev.2.01
Nov 14, 2007
Description
M51996A is the primary switching regulator controller which is especially designed to get the regulated DC voltage
from AC power supply.
This IC can directly drive the MOS FET with fast rise and fast fall output pulse and with a large-drive totempole output.
Type M51996A has the functions of not only high frequency OSC and fast output drive but also current limit with fast
response and high sensibility so the true “fast switching regulator” can be realized.
The M51996A is equivalent to the M51978 with externally re-settable OVP (over voltage protection) circuit.
Features
500kHz operation to MOS FET
Output current : ±1 A
Output rise time 60 ns, fall time 40 ns
Modified totempole output method with small through current
Compact and light-weight power supply
Small start-up current : 100 µA typ.
Big difference between “start-up voltage” and “stop voltage” makes the smoothing capacitor of the power input
section small.
Start-up threshold 16 V , stop voltage 10 V
Packages with high power dissipation are used to with-stand the heat generated by the gate-drive current of MOS
FET.
14-pin DIP, 16-pin SOP 1.5W (at 25°C)
Simplified peripheral circuit with protection circuit and built-in large-capacity totempole output
High-speed current limiting circuit using pulse-by-pulse method (CLM+pin)
Over-voltage protection circuit with an externally re-settable latch (OVP)
Protection circuit for output miss action at low supply voltage (UVLO)
High-performance and highly functional power supply
Triangular wave oscillator for easy dead time setting
SOFT start function by expanding period
Application
Feed forward regulator, fly-back regulator
REJ03D0836-0201 Rev.2.01 Nov 14, 2007
Page 1 of 35


Renesas Electronics Components Datasheet

M51996AFP Datasheet

SWITCHING REGULATOR CONTROL

No Preview Available !

M51996AP/AFP
Recommended Operating Conditions
Supply voltage range: 12 to 30 V
Operating frequency: less than 500 kHz
Oscillator frequency setting resistance
T-ON pin resistance
RON: 10 k to 75 k
T-OFF pin resistance
ROFF: 2 k to30 k
Block Diagram
OVP
REG (7.8 V)
Voltage
regulator
Under
voltage
lockout
5.8 V
F/B
7.1 V
3 k 500
15.2 k
1S
6S
1S 1S
OP AMP
+
Latch
PWM
Comparator
PWM
latch
VCC
2.5 V
CF
T-ON
T-OFF
Oscillator
(triangle)
Current
limit detection
DET
Collector
VOUT
Emitter
SOFT
CLM+
GND
REJ03D0836-0201 Rev.2.01 Nov 14, 2007
Page 2 of 35


Part Number M51996AFP
Description SWITCHING REGULATOR CONTROL
Maker Renesas
Total Page 30 Pages
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