M51995AFP

Manufacturer Part NumberM51995AFP
DescriptionIC REG STEP DOWN SWITCH ADJ POS 1.4V TO 16V 2A 20SOP
ManufacturerMITSUBISHI
M51995AFP datasheet
 


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DESCRIPTION
M51995A 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.
Type M51995A 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.
It has another big feature of current protection to short and over
current,owing to the integrated timer-type protection circuit,if few
parts are added to the primary side.
The M51995A is equivalent to the M51977 with externally re-
settable OVP(over voltage protection)circuit.
FEATURES
500kHz operation to MOS FET
•Output current...............................................................±2A
•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............................................90µA 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.
16-pin DIP,20-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(Two system of CLM+pin,CLM-pin)
•Protection by intermittent operation of output over current......
..........................................................Timer protection circuit
•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
APPLICATION
Feed forward regulator,fly-back regulator
RECOMMENDED OPERATING CONDITIONS
Supply voltage range............................................12 to 36V
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
VF
4
ON/OFF
5
OVP
6
DET
7
F/B
8
Outline 16P4
COLLECTOR
1
V
2
OUT
3
EMITTER
4
VF
5
HEAT SINK PIN
6
7
ON/OFF
8
OVP
9
DET
F/B
10
Outline 20P2N-A
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1
M51995AP/FP
Vcc
16
CLM+
15
CLM-
14
GND
13
CT
12
11
T-OFF
CF
10
9
T-ON
Vcc
20
CLM+
19
CLM-
18
GND
17
16
HEAT SINK PIN
15
CT
14
13
T-OFF
12
CF
11
T-ON
Connect the heat sink pin to GND.

M51995AFP Summary of contents