M51996FP

Manufacturer Part NumberM51996FP
DescriptionSwitching regulator control
ManufacturerMITSUBISHI
M51996FP datasheet
 
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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...............................................................±1A
Output rise time 60ns,fall time 40ns
Modified totempole output method with small through current
Compact and light-weight power supply
•Small start-up current............................................100µA typ.
•Big difference between "start-up voltage" and "stop voltage"
makes the smoothing capacitor of the power input section small.
Start-up threshold 16V,stop voltage 10V
•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
RECOMMENDED OPERATING CONDITIONS
Supply voltage range............................................12 to 30V
Operating frequency.................................less than 500kHz
Oscillator frequency setting resistance
•T-ON pin resistance R
...........................10k to 75k
ON
•T-OFF pin resistance R
..........................2k to 30k
OFF
MITSUBISHI (Dig./Ana. INTERFACE)
SWITCHING REGULATOR CONTROL
PIN CONFIGURATION (TOP VIEW)
COLLECTOR
1
V
OUT
2
EMITTER
3
OVP
4
5
F/B
6
DET
REG
7
Outline 14P4
COLLECTOR
1
V
2
OUT
3
EMITTER
HEAT SINK PIN
4
OVP
5
F/B
6
DET
7
REG
8
Outline 16P2N-A
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M51996AP/FP
Vcc
14
CLM+
13
GND
12
T-OFF
11
CF
10
9
T-ON
SOFT
8
Vcc
16
CLM+
15
14
GND
HEAT SINK PIN
13
T-OFF
12
CF
11
T-ON
10
SOFT
9
Connect the heat sink pin to GND.

M51996FP Summary of contents