Mitsubishi M51995FP, M51995AP Datasheet

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 re­settable OVP(over voltage protection)circuit.

MITSUBISHI (Dig./Ana. INTERFACE)

M51995AP/FP

PIN CONFIGURATION (TOP VIEW)

Vcc

COLLECTOR

VOUT

EMITTER

VF

ON/OFF

OVP

DET

F/B

1
2
3
4

Outline 16P4

16

CLM+

15
14

CLM-

13

GND

125

CT

116

T-OFF

107

CF

98

T-ON

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

Vcc

20

CLM+

19
18

CLM-

17

GND

165
156
147

CT

138

T-OFF

12

CF

1110

T-ON

VOUT

VF

1
2
3
4

COLLECTOR

EMITTER

HEAT SINK PIN HEAT SINK PIN

ON/OFF

OVP

9

DET

F/B

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 RON...........................10k to 75kΩ

•T-OFF pin resistance ROFF..........................2k to 30kΩ

( / 27 )

1

SWITCHING REGULATOR CONTROL

BLOCK DIAGRAM

OP AMP

ACTION

OSCILLATOR CAPACITANCE CF

ON/OFF

VCC

UNDER
VOLTAGE
LOCKOUT

VOLTAGE

REGULATOR

7.1V

5.8V

15.2K

1S

3K

MITSUBISHI (Dig./Ana. INTERFACE)

M51995AP/FP

F/B

500

6S

DET

GND

OVP(shut down)

OSCILLATOR RESISTANCE T-ON

(ON duty)

OSCILLATOR RESISTANCE T-OFF

(OFF duty)

VF

LATCH

OSCILLATOR

(TRIANGLE)

1S

+CURRENT

LIMIT LATCH

CLM+

+CURRENT LIMIT

1S

PWM

COMPARATOR

-CURRENT

LIMIT LATCH

-CURRENT LIMIT

CLM-

ABSOLUTE MAXIMUM RATINGS

Symbol Ratings UnitParameter Conditions
VCC Supply voltage
VC

IO

VVF
VON/OFF
VCLM-
VCLM+
IOVP
VDET
IDET
VFB
ITON

ITOFF

Pd
K
Topr
Tstg
Tj Junction temperature

Collector voltage
Output current

VF 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

Peak

Continuous

Ta=25˚C
Ta>25˚C

PWM

LATCH

INTERMITTENT

ACTION AND

OSC CONTROL

INTERMITTENT OPERATION

2.5V

INTERMITTENT

CT

DETERMINE CAPACITANCE

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

COLLECTOR

VOUT

EMITTER

V
V

A
V

V
V
V

mA

V

mA

V

mA
mA

W

mW/˚C

˚C
˚C

˚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.

( / 27 )

2

SWITCHING REGULATOR CONTROL

MITSUBISHI (Dig./Ana. INTERFACE)

ELECTRICAL CHARACTERISTICS (VCC=18V, Ta=25°C, unless otherwise noted)

Block

Symbol Test conditions UnitParameter

VCC
VCC(START)
VCC(STOP)

∆Vcc

IccL

IccO
Icc OFF

Icc CT

Icc OVP

VTHH ON/OFF

VTHL ON/OFF

∆VTHON/OFF

IFBMIND
IFBMAXD

∆IFB

VFB

RFB
VDET
IINDET

GAVDET
VTHOVPH
∆VTHOVP

ITHOVP

IINOVP

VCCOVPC

VCC(STOP)

-VCCOVPC

ITHOVPC

fTIMER

ITIMECH

TIMEOFF/ON

VTHCLM-

IINCLM-

TPDCLM-

VTHCLM+

IINCLM+

TPDCLM+

Operating supply voltage range
Operation start up voltage
Operation stop voltage

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

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 VOUT

CLM+ terminal threshold voltage

CLM+ terminal current

Delay time from CLM+ to VOUT

∆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

F/B terminal input current
F/B terminal input current

∆IFB=IFBMIND-IFBMAXD
F/B terminal input current=0.95mA

VDET=2.5V

∆VTHOVP=VTHOVPH-VTHOVPL

VOVP=400mV

OVP terminal is open.
(high impedance)

Vcc=30V

Vcc=18V

CT=4.7µF

VCT=3.3V,Ta=-5°C

Ta=25°C
Ta=85°C

-5≤Ta≤85°C

VCLM-=-0.1V

-5≤Ta≤85°C
VCLM+=0V

M51995AP/FP

Limits

Min. Typ. Max.

Vcc(STOP)

15.2

0.95

0.95

-0.90

-1.35 -0.99 -0.70

-480

-210

0.27

-193

-178

-147

-220

-170

180

-270

16.2 17.2

5.0
50

40
10

50

1.3

125

2.1

1.9

0.1

-2.1

4.9

420

2.4 2.5 2.6

30

540

80
80 150

7.5

0.55

7.0

6.3 7.6
90

90
15

1.31
90

1.35

160

2.0

200

2.6

2.4

0.2

-1.54

-0.55

5.9

600

1.0
40

750

150 250

9.0 10.0

1.20

-320 -213

-140 -93

0.40 0.60

-138

-127

-105

8.7

-200

-125
100

200

-205
100

35

140
190

21

5.0

140

2.0

240

3.0

310

3.1

2.9

3.0

-1.0

-0.40

7.1

780

3.0

960

30

250

-102

-94

-78

11.0

-180

-90

220

-140

V
V

V9.0 9.9 10.9
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

µA

Hz

µA

mV

µA

ns

mV

µA

ns

( / 27 )

3

SWITCHING REGULATOR CONTROL

MITSUBISHI (Dig./Ana. INTERFACE)

Block

ELECTRICAL CHARACTERISTICS (VCC=18V,Ta=25˚C, unless otherwise noted)(CONTINUE)

Symbol

fOSC
TDUTY

VOSCH
VOSCL

∆VOSC

fOSCVF

TVFDUTY

VTHTIME

IVF

VOL1

VOL2
VOL3
VOL4

VOH1

VOH2

TRISE

TFALL

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
OSC frequency in CLM

operating state
Duty in CLM operating state
VF voltage at timer operating start
VF terminal input current

Output low voltage

Output high voltage
Output voltage rise time

Output voltage fall time

VF=5V

VF=2V

VF=0.2V

RON=20kΩ,ROFF=17kΩ
CF=220pF,-5≤Ta≤85°C

fOSC=188kHz

fOSC=188kHz

fOSC=188kHz

RON=20kΩ,ROFF=17kΩ
CF=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

Test conditions

M51995AP/FP

Limits

Min. Typ. Max.
170 188 207

47.0 50.0 53.0

3.97 4.37 4.77

1.76 1.96 2.16

2.11
170

108

11.0 13.7

2.7

16.0

15.5

2.41 2.71

188 207
124 143

22.0

3.0

0.05

0.7

0.69

1.3

16.5

16.0
50
35

3.3

2

0.4

1.4

1.0

2.0

UnitParameter

kHz

kHz

6

%
V

V
V

V

µA

V
V

V
V

V

V
ns
ns

( / 27 )

4

SWITCHING REGULATOR CONTROL

TYPICAL CHARACTERISTICS

0

threshold voltage

(VTHOVPL)

ROFF=20kΩ

Ta=-30°C

Ta=25°C

Ta=85°C

fOSC=500kHz

fOSC=100kHz

THERMAL DERATING

1800

1500

1200

(MAXIMUM RATING)

MITSUBISHI (Dig./Ana. INTERFACE)

M51995AP/FP

CIRCUIT CURRENT VS.SUPPLY VOLTAGE

22m

18m

16m

14m

(NORMAL OPERATION)

RON=18kΩ

900

600

300

0

0 25 50 75

AMBIENT TEMPERATURE Ta(°C)

CIRCUIT CURRENT VS.SUPPLY VOLTAGE

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

(OVP OPERATION)

85

Ta=-30°C

Ta=25°C

Ta=85°C

100

125 150

12m
10m

100µ

50µ

0

CIRCUIT CURRENT VS.SUPPLY VOLTAGE

3.0

2.0

1.0

10

SUPPLY VOLTAGE Vcc(V)

20 30

(OFF STATE)

Ta=25°C

Ta=85°C

Ta=-30°C

40

1.0

0

0

CIRCUIT CURRENT VS.SUPPLY VOLTAGE

3.0

2.0

1.0

0

0

10.0 20.0 30.0

SUPPLY VOLTAGE Vcc(V)

(TIMER OFF STATE)

Ta=25°C
Ta=85°C

Ta=-30°C

10 20 30

SUPPLY VOLTAGE Vcc(V)

40.0

40

( / 27 )

5

1.1

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0

0

10 20 30
SUPPLY VOLTAGE Vcc(V)

OVP TERMINAL THRESHOLD VOLTAGE

VS.AMBIENT TEMPERATURE

H threshold voltage

L

-40 -20
AMBIENT TEMPERATURE Ta(°C)

20 40 60

40

(VTHOVPH)

80 100

SWITCHING REGULATOR CONTROL

MITSUBISHI (Dig./Ana. INTERFACE)

M51995AP/FP

THRESHOLD VOLTAGE OF ON/OFF

TERMINAL VS.AMBIENT TEMPERATURE

3.4

3.2

3.0

ON OFF

2.8

2.6

2.4

OFF ON

2.2

2.0

1.8

-40 -20 0 20 40 60

AMBIENT TEMPERATURE Ta(°C)

INPUT CURRENT OF VF TERMINAL

-10

-9

-8

-7

-6

-5

-4

-3

-2

-1

VS.INPUT VOLTAGE

Ta=-30°C
Ta=25°C
Ta=85°C

80 100

THRESHOLD VOLTAGE OF ON/OFF

TERMINAL VS.AMBIENT TEMPERATURE

25.0

ON OFF

20.0

15.0

-20

OFF ON

20

0

40 60 80 100

5.0

0

-60

-40

AMBIENT TEMPERATURE Ta(°C)

DISCHARGE CURRENT OF TIMER

18

17

16

15

14

13

12

11

VS.AMBIENT TEMPERATURE

0

0 1 2 3 4 5 6 7 8 9 10

VF TERMINAL VOLTAGE VVF(V)

CHARGE CURRENT OF TIMER

-200

-180

-160

-140

-120

-100

-80

-60

-40

-60

VS.AMBIENT TEMPERATURE

-40 -20

0 20 40

60

AMBIENT TEMPERATURE Ta(°C)

80 100

( / 27 )

6

10

-60 -40

-20 0 20 40 60

AMBIENT TEMPERATURE Ta(°C)

ON AND OFF DURATION OF TIMER

VS.AMBIENT TEMPERATURE

175

150

(INTERMITTENT OPERATION)

TIMER ON•••CIRCUIT OPERATION ON
TIMER OFF••CIRCUIT OPERATION OFF

TIMER ON

125

100

75

-40 -20

-60

TIMER OFF

0 20 40

AMBIENT TEMPERATURE Ta(°C)

60

80

100

80 100

1.4

1.3

1.2

1.1

1.0

SWITCHING REGULATOR CONTROL

MITSUBISHI (Dig./Ana. INTERFACE)

M51995AP/FP

VF THRESHOLD VOLTAGE FOR TIMER

VS. AMBIENT TEMPERATURE

3.5

3.0

2.5

-40 -20 0 20 40 60 80

-60
AMBIENT TEMPERATURE Ta(°C)

THRESHOLD VOLTAGE OF CLM- TERMINAL

VS. AMBIENT TEMPERATURE

205

200

100

THRESHOLD VOLTAGE OF CLM+ TERMINAL

VS. AMBIENT TEMPERATURE

205

200

195

-40 -20 0 20 40 60 80

-60
AMBIENT TEMPERATURE Ta(°C)

CLM+ TERMINAL CURRENT

-400

-300

-200

VS. CLM+ TERMINAL VOLTAGE

Ta=-30°C

Ta=25°C

Ta=85°C

100

195

-40 -20 0 20 40 60 80

-60
AMBIENT TEMPERATURE Ta(°C)

CLM- TERMINAL CURRENT

-500

-400

-300

-200

-100

0

VS. CLM- TERMINAL VOLTAGE

Ta=-30°C
Ta=25°C

Ta=85°C

0 -0.2 -0.4 -0.6 -0.8

CLM- TERMINAL VOLTAGE VCLM-(V) OUTPUT SOURCE CURRENT IOH(A)

100

-1.0

( / 27 )7

-100

0

0

0.1 0.2

2.6
Vcc=18V

2.4

Ta=25°C

2.2

2.0

1.8

1.6

1.4

1.2

1.0

0.8

0.6

1m 10m

0.3

0.4 0.5 0.6 0.7 0.8 0.9

CLM+ TERMINAL VOLTAGE VCLM+(V)

OUTPUT HIGH VOLTAGE VS.

OUTPUT SOURCE CURRENT

100m

1 10

1.0

SWITCHING REGULATOR CONTROL

MITSUBISHI (Dig./Ana. INTERFACE)

M51995AP/FP

OUTPUT LOW VOLTAGE

5.0

4.0

3.0

2.0

1.0

0

1m

1.6

1.5

1.4

VS. OUTPUT SINK CURRENT

Ta=25°C

Vcc=18V

Vcc=5V

10m 100m 1

OUTPUT SINK CURRENT IOL(A)

INPUT CURRENT OF DETECTION AMP

VS. AMBIENT TEMPERATURE

10

2.55

2.50

2.45

2.40

50.0

40.0

DETECTION VOLTAGE

VS. AMBIENT TEMPERATURE

-40 -20 0 20 40 60 80

-60
AMBIENT TEMPERATURE Ta(°C)

DETECTION AMP VOLTAGE GAIN

VS. FREQUENCY

100

1.3

1.2

1.1

1.0

0.9

0.8

-40 -20 0 20 40 60 80

-60
AMBIENT TEMPERATURE Ta(°C)

VS. F/B TERMINAL INPUT CURRENT

50

40

30

20

ON duty

(fOSC=100kHz)
RON=18kΩ
ROFF=20kΩ

Ta=-30°C
Ta=25°C

Ta=85°C

100

30.0

20.0

10.0

0

20

100

50

40

30

1k 10k 100k 1M 10M

FREQUENCY f(Hz)

ON duty

VS. F/B TERMINAL INPUT CURRENT

(fOSC=200kHz)
RON=18kΩ
ROFF=20kΩ

Ta=-30°C
Ta=25°C

Ta=85°C

10

0

0 0.5

F/B TERMINAL INPUT CURRENT IF/B (mA)

1.0

1.5 2.0

2.5

10

( / 27 )

8

0

0 0.5

F/B TERMINAL INPUT CURRENT IF/B (mA)

1.0

1.5 2.0

2.5

SWITCHING REGULATOR CONTROL

MITSUBISHI (Dig./Ana. INTERFACE)

333333557

7

M51995AP/FP

50

40

30

20

10

0

10000

1000

100

10

1

120

110

F/B TERMINAL INPUT CURRENT

0 0.5 1.0 1.5 2.0 2.5

F/B TERMINAL INPUT CURRENT IF/B(mA)

OSCILLATING FREQUENCY VS. CF

RON=22kΩ
ROFF=12kΩ

RON=36kΩ
ROFF=6.2kΩ

RON=24kΩ
ROFF=20kΩ

1 10 100 1000 10000

CF TERMINAL CAPACITY(pF)

OSCILLATING FREQUENCY VS.

ON duty VS.

(fOSC=500kHz)
RON=18kΩ
ROFF=20kΩ

Ta=-30°C
Ta=25°C

Ta=85°C

TERMINAL CAPACITY

AMBIENT TEMPERATURE

RON=24kΩ
ROFF=20kΩ
CF=330pF

UPPER & LOWER LIMIT VOLTAGE OF OSC

VS. AMBIENT TEMPERATURE

RON=18kΩ

5.2

ROFF=20kΩ

4.8

4.4

4.0

2.2

2.0

1.8

-40 -20 0 20 40 60 80

-60
AMBIENT TEMPERATURE Ta(°C)

100

90
80
70
60
50
40
30
20
10

0

1 10 100

OSCILLATING FREQUENCY VS.

700

600

AMBIENT TEMPERATURE

fOSC=500kHz
fOSC=200kHz
fOSC=100kHz

fOSC=100kHz
fOSC=200kHz

fOSC=500kHz

ON duty VS. ROFF

ROFF(kΩ)

RON=75kΩ
51kΩ

36kΩ

24kΩ
22kΩ
18kΩ
15kΩ

10kΩ

RON=24kΩ
ROFF=20kΩ
CF=47pF

100

500

100

400

90

80

-40 -20 0 20 40 60 80

-60
AMBIENT TEMPERATURE Ta(°C)

100

( / 27 )

9

300

200

-40 -20 0 20 40 60 80

-60
AMBIENT TEMPERATURE Ta(°C)

100