MITSUBISHI (Dig./Ana. INTERFACE)
M51995AP/FP
SWITCHING REGULATOR CONTROL
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.
COLLECTOR
V
OUT
EMITTER
VF
ON/OFF
OVP
DET
F/B
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
PIN CONFIGURATION (TOP VIEW)
Vcc
CLM+
CLM-
GND
CT
T-OFF
CF
T-ON
Outline 16P4
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
HEAT SINK PIN
6
15
14
13
12
11
COLLECTOR
V
OUT
EMITTER
VF
1
2
3
4
5
20
19
18
17
16
Vcc
CLM+
CLM-
GND
HEAT SINK PIN
ON/OFF
OVP
DET
F/B
7
8
9
10
CT
T-OFF
CF
T-ON
Outline 20P2N-A
Connect the heat sink pin to GND.
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
ON
...........................10k to 75kΩ
•T-OFF pin resistance R
OFF
..........................2k to 30kΩ
( 1 / 27 )
MITSUBISHI (Dig./Ana. INTERFACE)
M51995AP/FP
SWITCHING REGULATOR CONTROL
BLOCK DIAGRAM
V
CC
7.1V
5.8V
ON/OFF
UNDER
VOLTAGE
LOCKOUT
VOLTAGE
REGULATOR
15.2K
1S
3K
500
F/B
DET
GND
6S
OP AMP
1S
OVP(shut down)
LATCH
1S
2.5V
COLLECTOR
PWM
COMPARATOR
PWM
LATCH
V
OUT
EMITTER
OSCILLATOR CAPACITANCE CF
OSCILLATOR RESISTANCE T-ON
(ON duty)
OSCILLATOR RESISTANCE T-OFF
(OFF duty)
OSCILLATOR
(TRIANGLE)
+CURRENT
LIMIT LATCH
-CURRENT
LIMIT LATCH
INTERMITTENT
ACTION AND
OSC CONTROL
INTERMITTENT
ACTION
VF
CLM+
+CURRENT LIMIT
CLM-
-CURRENT LIMIT
CT
INTERMITTENT OPERATION
DETERMINE CAPACITANCE
ABSOLUTE MAXIMUM RATINGS
Symbol
V
CC
V
C
I
O
V
VF
V
ON/OFF
V
CLM-
V
CLM+
I
OVP
V
DET
I
DET
V
FB
I
TON
I
TOFF
P
d
K
T
opr
T
stg
Tj
Parameter
Supply voltage
Collector voltage
Output current
V
F
terminal voltage
ON/OFF terminal voltage
CLM-terminal voltage
CLM+terminal voltage
OVP terminal current
DET terminal voltage
DET terminal input current
F/B terminal voltage
T-ON terminal input current
T-OFF terminal input current
Power dissipation
Thermal derating factor
Operating temperature
Storage temperature
Junction temperature
Peak
Continuous
Conditions
Ratings
36
36
±2
±0.15
Vcc
Vcc
-4.0 to +4.0
-0.3 to +4.0
8
6
5
0~10
-1
-2
1.5
12
-30 to +85
-40 to +125
150
Unit
V
V
A
V
V
V
V
mA
V
mA
V
mA
mA
W
mW/˚C
˚C
˚C
˚C
Ta=25˚C
Ta>25˚C
Note 1."+" sign shows the direction of current flow into the IC and "-" sign shows the current flow from the IC.
2.This terminal has the constant voltage characteristic of 6 to 8V,when current is supplied from outside.The maximum allowable
voltage is 6V when the constant voltage is applied to this terminal.And maximum allowable current into this terminal is 5mA.
3.The low impedance voltage supply should not be applied to the OVP terminal.
( 2 / 27 )
MITSUBISHI (Dig./Ana. INTERFACE)
M51995AP/FP
SWITCHING REGULATOR CONTROL
ELECTRICAL CHARACTERISTICS
(V
CC
=18V, Ta=25°C, unless otherwise noted)
Block
Symbol
Parameter
Test conditions
Min.
Vcc(STOP)
Limits
Typ.
16.2
9.9
6.3
90
90
15
1.31
90
1.35
160
2.0
200
2.6
2.4
0.2
-1.54
-0.55
-0.99
5.9
600
2.5
1.0
40
750
30
150
150
9.0
1.20
-320
-140
0.40
-138
-127
-105
8.7
-200
-125
100
200
-205
100
Operating supply voltage range
V
CC
V
CC(START)
Operation start up voltage
V
CC(STOP)
Operation stop voltage
∆Vcc
Icc
L
Icc
O
Icc
OFF
Icc
CT
Icc
OVP
V
THH ON/OFF
V
THL ON/OFF
∆V
THON/OFF
I
FBMIND
I
FBMAXD
∆I
FB
V
FB
R
FB
V
DET
I
INDET
G
AVDET
V
THOVPH
∆V
THOVP
I
THOVP
I
INOVP
V
CCOVPC
V
CC(STOP)
-
V
CCOVPC
I
THOVPC
f
TIMER
I
TIMECH
TIME
OFF/ON
V
THCLM-
I
INCLM-
T
PDCLM-
V
THCLM+
I
INCLM+
T
PDCLM+
Difference voltage between
operation start and stop
Stand-by current
Operating circuit current
Circuit current in OFF state
Circuit current in timer OFF state
Circuit current in OVP state
ON/OFF terminal high threshold voltage
ON/OFF terminal low threshold voltage
ON/OFF terminal hysteresis voltage
15.2
9.0
∆Vcc=Vcc
(START) -
Vcc
(STOP)
Vcc=14.5V,Ta=25°C
Vcc=14.5V,-30≤Ta≤85°C
Vcc=30V
Vcc=25V
Vcc=14V
Vcc=25V
Vcc=14V
Vcc=25V
Vcc=9.5V
5.0
50
40
10
0.95
50
0.95
1.3
125
2.1
1.9
0.1
F/B terminal input current
F/B terminal input current
∆I
FB
=I
FBMIND
-I
FBMAXD
F/B terminal input current=0.95mA
-2.1
-0.90
-1.35
4.9
420
2.4
30
540
∆V
THOVP
=V
THOVPH
-V
THOVPL
V
OVP
=400mV
OVP terminal is open.
(high impedance)
Vcc=30V
Vcc=18V
C
T
=4.7µF
V
CT
=3.3V,Ta=-5°C
Ta=25°C
Ta=85°C
-5≤Ta≤85°C
V
CLM
-=-0.1V
-5≤Ta≤85°C
V
CLM
+=0V
80
80
7.5
0.55
-480
-210
0.27
-193
-178
-147
7.0
-220
-170
180
-270
Max.
35
17.2
10.9
7.6
140
190
21
5.0
140
2.0
240
3.0
310
3.1
2.9
3.0
-1.0
-0.40
-0.70
7.1
780
2.6
3.0
960
250
250
10.0
Unit
V
V
V
V
µA
µA
mA
mA
µA
mA
µA
mA
µA
V
V
V
mA
mA
mA
V
Ω
V
µA
dB
mV
mV
µA
µA
V
V
Current at 0% duty
Current at maximum duty
Current difference between max and 0% duty
Terminal voltage
Terminal resistance
Detection voltage
Input current of detection amp
Voltage gain of detection amp
OVP terminal H threshold voltage
OVP terminal hysteresis voltage
OVP terminal threshold current
OVP terminal input current
OVP reset supply voltage
Difference supply voltage between
operation stop and OVP reset
Current from OVP terminal for
OVP reset
Timer frequency
Timer charge current
OFF time/ON time ratio
CLM- terminal threshold voltage
CLM- terminal current
Delay time from CLM- to V
OUT
CLM+ terminal threshold voltage
CLM+ terminal current
Delay time from CLM+ to V
OUT
V
DET
=2.5V
-213
-93
0.60
-102
-94
-78
11.0
-180
-90
220
-140
µA
Hz
µA
mV
µA
ns
mV
µA
ns
( 3
/ 27 )
MITSUBISHI (Dig./Ana. INTERFACE)
M51995AP/FP
SWITCHING REGULATOR CONTROL
ELECTRICAL CHARACTERISTICS
(V
CC
=18V,Ta=25˚C, unless otherwise noted)(CONTINUE)
Block
Symbol
f
OSC
T
DUTY
V
OSCH
V
OSCL
∆V
OSC
f
OSCVF
T
VFDUTY
V
THTIME
I
VF
V
OL
1
V
OL
2
V
OL
3
V
OL
4
V
OH
1
V
OH
2
T
RISE
T
FALL
Parameter
Oscillating frequency
Maximum ON duty
Upper limit voltage of oscillation waveform
Lower limit voltage of oscillation waveform
Voltage difference between upper limit and
lower limit of OSC waveform
V
F
=5V
OSC frequency in CLM
operating state
V
F
=2V
Duty in CLM operating state V
F
=0.2V
V
F
voltage at timer operating start
V
F
terminal input current
Output low voltage
Test conditions
R
ON
=20kΩ,R
OFF
=17kΩ
C
F
=220pF,-5≤Ta≤85°C
f
OSC
=188kHz
f
OSC
=188kHz
f
OSC
=188kHz
R
ON
=20kΩ,R
OFF
=17kΩ
C
F
=220pF
Min off duty/Max on duty
Source current
Vcc=18V,Io=10mA
Vcc=18V,Io=100mA
Vcc=5V,Io=1mA
Vcc=5V,Io=100mA
Vcc=18V,Io=-10mA
Vcc=18V,Io=-100mA
No load
No load
Min.
170
47.0
3.97
1.76
2.11
170
108
11.0
2.7
Limits
Typ.
188
50.0
4.37
1.96
2.41
188
124
13.7
3.0
2
0.05
0.7
0.69
1.3
16.5
16.0
50
35
Max.
207
53.0
4.77
2.16
2.71
207
143
22.0
3.3
6
0.4
1.4
1.0
2.0
Unit
kHz
%
V
V
V
kHz
Output high voltage
Output voltage rise time
Output voltage fall time
16.0
15.5
V
µA
V
V
V
V
V
V
ns
ns
( 4 / 27 )
MITSUBISHI (Dig./Ana. INTERFACE)
M51995AP/FP
SWITCHING REGULATOR CONTROL
TYPICAL CHARACTERISTICS
1800
THERMAL DERATING
(MAXIMUM RATING)
22m
18m
16m
1200
14m
900
12m
f
OSC
=100kHz
R
ON
=18kΩ
R
OFF
=20kΩ
f
OSC
=500kHz
CIRCUIT CURRENT VS.SUPPLY VOLTAGE
(NORMAL OPERATION)
1500
600
300
10m
100µ
50µ
Ta=-30°C
Ta=25°C
Ta=85°C
0
0
25
50
75 85 100
125
150
0
10
20
30
SUPPLY VOLTAGE Vcc(V)
40
AMBIENT TEMPERATURE Ta(°C)
CIRCUIT CURRENT VS.SUPPLY VOLTAGE
(OVP OPERATION)
8.0
OVP RESET POINT
8.87V(-30°C)
7.0
8.94V(25°C)
9.23V(85°C)
6.0
5.0
4.0
3.0
2.0
1.0
0
0
0
40
Ta=-30°C
Ta=25°C
Ta=85°C
1.0
3.0
CIRCUIT CURRENT VS.SUPPLY VOLTAGE
(OFF STATE)
2.0
Ta=25°C
Ta=85°C
Ta=-30°C
10.0
20.0
30.0
40.0
0
10
20
30
SUPPLY VOLTAGE Vcc(V)
CIRCUIT CURRENT VS.SUPPLY VOLTAGE
(TIMER OFF STATE)
3.0
1.0
0.9
2.0
Ta=25°C
Ta=85°C
Ta=-30°C
0.7
0.6
1.0
0.5
0.4
0
40
0.3
-40
0.8
SUPPLY VOLTAGE Vcc(V)
OVP TERMINAL THRESHOLD VOLTAGE
VS.AMBIENT TEMPERATURE
1.1
H threshold voltage
(V
THOVPH
)
L threshold voltage
(V
THOVPL
)
0
10
20
30
SUPPLY VOLTAGE Vcc(V)
-20
0
20 40
60
80 100
AMBIENT TEMPERATURE Ta(°C)
( 5 / 27 )
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