Mitsubishi M51996FP, M51996AP Datasheet

SWITCHING REGULATOR CONTROL

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 re­settable 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

MITSUBISHI (Dig./Ana. INTERFACE)

M51996AP/FP

PIN CONFIGURATION (TOP VIEW)

Vcc

COLLECTOR

VOUT

EMITTER

OVP

F/B

DET

REG SOFT

COLLECTOR

VOUT

EMITTER

HEAT SINK PIN

OVP

F/B

DET

REG

1
2
3
4

Outline 14P4

1
2
3
4

Outline 16P2N-A

Connect the heat sink pin to GND.

14

CLM+

13

GND

12

T-OFF

11

CF

105

96

T-ON

87

Vcc

16

CLM+

15
14

GND

13

HEAT SINK PIN

125

T-OFF

CF

116
107

T-ON
SOFT

98

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

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

1

( / 22 )

SWITCHING REGULATOR CONTROL

BLOCK DIAGRAM

OP AMP

REG(7.8V)

7.1V

MITSUBISHI (Dig./Ana. INTERFACE)

M51996AP/FP

F/B

VCC

OVP

CF

T-ON

T-OFF

UNDER

VOLTAGE

LOCK OUT

LATCH

OSCILLATOR

(TRIANGLE)

VOLTAGE

REGULATOR

SOFT

5.8V

15.2K

1S

1S

1S

PWM

COMPARATOR

3K

500

6S

PWM

LATCH

CURRENT LIMIT

DETECTION

CLM+

DET

2.5V

COLLECTOR

VOUT

EMITTER

GND

ABSOLUTE MAXIMUM RATINGS

Symbol Ratings UnitParameter Conditions
VCC Supply voltage
VC

IO

IVREG
VSOFT

VCLM+
VDET

IOVP

IFB

ITON
ITOFF

Pd
K
Topr
Tstg

Note 1."+" sign shows the direction of current flowing into the IC and "-" sign shows the current flowing out from the IC.

2.The low impedance voltage supply should not be applied to the OVP terminal.

Collector voltage
Output current

VREG terminal output current

SOFT terminal voltage
CLM+ terminal voltage
DET terminal voltage
OVP terminal current

F/B terminal current

T-ON terminal input current

T-OFF terminal input current
Power dissipation
Thermal derating
Operating temperature
Storage temperature

Peak
Continuous

Ta=25˚C
Ta>25˚C

±0.15

VREG +0.2

-0.3 to +3

-30 to +85

-40 to +125

31
31
±1

-6

6
8

-10

-1

-2

1.5
12

V
V

A

mA

V
V

V
mA
mA
mA
mA

W

mW/˚C

˚C

˚C

( / 22 )

2

SWITCHING REGULATOR CONTROL

MITSUBISHI (Dig./Ana. INTERFACE)

Oscillating frequency during
SOFT operation

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

Block

Symbol Test conditions UnitParameter

VCC
VCC(START)
VCC(STOP)

∆Vcc

IccL

IccO

IccOVP
IFBMIND

IFBMAXD

∆IFB
VFB

RFB
VTHOVPH
∆VTHOVP

ITHOVP

IINOVP

VCCOVPC

VCC(STOP)

-VCCOVPC

ITHOVPC

VTHCLM+

IINCLM+

TPDCLM+

fOSC

TDUTY
VOSCH
VOSCL

∆VOSC

VT-ON
VT-OFF

fOSCSOFT

ISOFTIN
ISOFDIS

VREG

VOL1

VOL2
VOL3
VOL4

VOH1

VOH2

TRISE
TFALL

VDET

IINDET

GAVDET

Operating supply voltage range
Operation start up voltage
Operation stop voltage

Vcc(START),Vcc(STOP) difference

Stand-by current

Operating circuit current

Circuit current in OVP state
Current at 0% duty

Current at maximum duty

Current difference between max and 0% duty

F/B terminal voltage
OVP terminal resistance
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

CLM+ terminal threshold voltage
CLM+ terminal current
Delay time from CLM+ to VOUT

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

T-ON terminal voltage

T-OFF terminal voltage

VSOFT=5.5V

VSOFT=2.5V
VSOFT=0.2V

SOFT terminal input current
SOFT terminal discharging current

Regulator output voltage

Output low voltage

Output high voltage

Output voltage rise time
Output voltage fall time

Detection voltage
DET terminal input current
Voltage gain of detection amp

∆Vcc=Vcc(START) -Vcc(STOP)
Vcc=14.5V,Ta=25°C

Vcc=14.5V,-30≤Ta≤85°C
Vcc=15V,f=188kHz

Vcc=30V,f=188kHz

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

∆VTHOVP=VTHOVPH-VTHOVPL

VOVP=400mV

OVP terminal is open.
(high impedance)

Vcc=30V

Vcc=18V

VCLM+=0V

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

RON=20kΩ,ROFF=17kΩ
CF=220pF

RON=20kΩ

ROFF=17kΩ

RON=20kΩ,ROFF=17kΩ
CF=220pF

VSOFT=1V

Discharge current of SOFT terminal at
Vcc less than Vcc(STOP)

Vcc=18V,Io=10mA
Vcc=18V,Io=100mA
Vcc=5V,Io=1mA

Vcc=5V,Io=100mA
Vcc=18V,Io=-10mA

Vcc=18V,Io=-100mA

VDET=2.5V

M51996AP/FP

Limits

Min. Typ. Max.

Vcc(STOP)

15.2

-2.1

-0.9

-1.35 -0.99 -0.70

420

-480

-210

-280

170 188 207
47 50 53

3.97 4.37 4.77

1.76 1.96 2.16

2.11

170
111

19.0

-0.5

16.0

15.5

16.2 17.2

5.0
65

50

7.3

1.3

140 320

4.9

540

80
80 150

7.5

0.55

180

3.8

2.9

6.8

2.4 2.5 2.6

30

8

1

6.3 7.6

100
100

11
12

2.0

210

-1.5

-0.6

5.9
600

750

150 250

9.0 10.0

1.20

-320 -213

-140 -93
200

-200
100

2.41 2.71

4.5

3.5

188 207
131 151

23.3

-0.1

3.3

7.8

0.04

0.7

0.85

1.3

16.7

16.5

60
40

1.0
40

30

150
200

17
19

3.0

-1.0

-0.4

7.1

780

960

30

250

220

-140

5.4

4.2

27.0

8.8

0.4

1.4

1.0

2.0

3.0

V

V

V9.0 9.9 10.9

V

µA

mA
mA

µA

mA
mA
mA

V

Ω

mV
mV

µA

µA

V
V

µA

mV

µA
ns

kHz

%

V

V
V

V
V

kHz

µA
mA

V
V
V

V
V

V

V

ns

ns

V

µA

dB

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3

SWITCHING REGULATOR CONTROL

TYPICAL CHARACTERISTICS

ROFF=20kΩ

Ta=-30°C

Ta=25°C

Ta=85°C

fOSC=500kHz

fOSC=100kHz

12345

6

RON=15k,ROFF=27k

RON=18k,ROFF=24k

RON=22k,ROFF=22k

RON=24k,ROFF=20k

RON=22k,ROFF=12k

RON=36k,ROFF=6.2k

12345

6

12345

6

RON=15k,ROFF=27k

RON=18k,ROFF=24k

RON=22k,ROFF=22k

RON=24k,ROFF=20k

RON=22k,ROFF=12k

RON=36k,ROFF=6.2k

12345

6

Ta=-30°C

Ta=25°C

Ta=85°C

THERMAL DERATING

1800

1500

1200

900

(MAXIMUM RATING)

MITSUBISHI (Dig./Ana. INTERFACE)

M51996AP/FP

CIRCUIT CURRENT VS.SUPPLY VOLTAGE

16m

14m

12m

10m

(NORMAL OPERATION)

RON=18kΩ

600

300

0

0 25 50 75

85

100

125 150

AMBIENT TEMPERATURE Ta(°C)

SOFT TERMINAL INPUT VOLTAGE VS.

5.0

4.5

EXPANSION RATE OF PERIOD

(fOSC=100kHz)

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5
0

0 2 4 6 8 10 12 14 16 18 20

EXPANSION RATE OF PERIOD(TIMES)

150m

100µ

50µ

10

0 20 30 40

5

15 25 35

SUPPLY VOLTAGE Vcc(V)

SOFT TERMINAL INPUT VOLTAGE VS.

5.0

4.5

EXPANSION RATE OF PERIOD

(fOSC=500kHz)

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5
0

0 2 4 6 8 10 12 14 16 18 20

EXPANSION RATE OF PERIOD(TIMES)

SOFT TERMINAL INPUT VOLTAGE VS.

-100

INPUT VOLTAGE

-90

-80

-70

-60

-50

-40

-30

-20

-10
0

0

2 3 4 5 6 7

1

SOFT TERMINAL INPUT VOLTAGE VSOFT(V)

CLM+ TERMINAL THRESHOLD VOLTAGE

VS. AMBIENT TEMPERATURE

205

200

195

10

9

8

-40 -20 0 20 40 60 80

-60

100

AMBIENT TEMPERATURE Ta(°C)

( / 22 )4

SWITCHING REGULATOR CONTROL

MITSUBISHI (Dig./Ana. INTERFACE)

-3-2-101-3-2-10123523523523523523523523

5

M51996AP/FP

-400

-300

-200

-100

4.5

4.2

3.9

3.6

3.3

3.0

2.7

2.4

2.1

1.8

1.5

1.2

2.55

CLM+ TERMINAL CURRENT

VS. CLM+ TERMINAL VOLTAGE

Ta=-30°C

Ta=25°C

Ta=85°C

0

0

Vcc=18V
Ta=25°C

10

0.1 0.2

0.3

0.4 0.5 0.6 0.7 0.8 0.9

CLM+ TERMINAL VOLTAGE VCLM+(V)

OUTPUT HIGH VOLTAGE VS.

SOURCE CURRENT

10

SOURCE CURRENT IOH(A)

DETECTION VOLTAGE

VS. AMBIENT TEMPERATURE

10

1.0

10 10

REG OUTPUT VOLTAGE

VS. AMBIENT TEMPERATURE

8.5

Rc=∞
Rc=3.6k
Rc=1.5k

8.0

7.5

7.0

-60 -40 -20 0 20 40 60 80
AMBIENT TEMPERATURE Ta(°C)

OUTPUT LOW VOLTAGE

5.0
Ta=25°C

4.5

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5
0

10

DETECTION TERMINAL INPUT CURRENT

1.4

1.3

VS. SINK CURRENT

Vcc=18V

Vcc=5V

10 10

SINK CURRENT IOL(A)

VS. AMBIENT TEMPERATURE

10

100

10

1.2

2.50

2.45

2.40

-40 -20 0 20 40 60 80

-60
AMBIENT TEMPERATURE Ta(°C)

100

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5

1.1

1.0

0.9

0.8

0.7

0

-40 -20 0 20 40 60 80

-60
AMBIENT TEMPERATURE Ta(°C)

100

SWITCHING REGULATOR CONTROL

MITSUBISHI (Dig./Ana. INTERFACE)

2103104105106235235235235

012340123

4

23523523523523523523523

5

M51996AP/FP

VOLTAGE GAIN OF DETECTION AMP

VS. FREQUENCY

50
45

40
35

30
25

20
15
10

5
0

10

FREQUENCY f(Hz)

ON duty

VS. F/B TERMINAL INPUT CURRENT

50

40

(fOSC=200kHz)
RON=18kΩ
ROFF=20kΩ

VS. F/B TERMINAL INPUT CURRENT

ON duty

50
45

40

(fOSC=100kHz)
RON=18kΩ

ROFF=20kΩ
35
30

Ta=-30°C

25
20

Ta=25°C

Ta=85°C

15
10

5

0

0 0.4 1.0 2.0

0.6 0.8 1.2 1.4 1.6 1.8 2.2

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

ON duty VS.

F/B TERMINAL INPUT CURRENT

50

(fOSC=500kHz)

RON=18kΩ

40

ROFF=20kΩ

30

Ta=-30°C

20

Ta=25°C
Ta=85°C

10

0

0 0.4 1.0 2.0

0.6 0.8 1.2 1.4 1.6 1.8 2.2

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

UPPER & LOWER LIMIT VOLTAGE OF OSC

VS. AMBIENT TEMPERATURE

RON=18kΩ

5.2

ROFF=20kΩ

4.8

4.4

4.0

2.2

fOSC=500kHz
fOSC=200kHz

fOSC=100kHz

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

2.0

30

20

10

0

0.4

0

0.6 0.8 1.2 1.4 1.6 1.8 2.2

1.0

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

OSCILLATING FREQUENCY VS. CF

TERMINAL CAPACITANCE

10

RON=22kΩ
ROFF=12kΩ

10

RON=36kΩ

10

ROFF=6.2kΩ

RON=24kΩ
ROFF=20kΩ

10

Ta=-30°C

Ta=25°C
Ta=85°C

2.0

1.8

-40 -20 0 20 40 60 80

-60
AMBIENT TEMPERATURE Ta(°C)

100

10

10 10

10

10

CF TERMINAL CAPACITANCE(pF)

10

( / 22 )6

SWITCHING REGULATOR CONTROL

MITSUBISHI (Dig./Ana. INTERFACE)

33557

7

RON=36k,ROFF=6.2k

RON=22k,ROFF=12k

RON=24k,ROFF=20k

RON=22k,ROFF=22k

RON=18k,ROFF=24k

RON=15k,ROFF=27k

RON=36k,ROFF=6.2k

RON=22k,ROFF=12k

RON=24k,ROFF=20k

RON=22k,ROFF=22k

RON=18k,ROFF=24k

RON=15k,ROFF=27k

RON=36k,ROFF=6.2k

RON=22k,ROFF=12k

RON=24k,ROFF=20k

RON=22k,ROFF=22k

RON=18k,ROFF=24k

RON=15k,ROFF=27k

012

M51996AP/FP

100

ON duty VS. ROFF

90
80
70

RON=75kΩ

60
50
40
30
20

51kΩ
36kΩ

24kΩ
22kΩ

18kΩ
15kΩ

10kΩ

10

0

10 10 10

ROFF(kΩ)

OSCILLATOR FREQUENCY VS.

700

AMBIENT TEMPERATURE

RON=24kΩ

600

ROFF=20kΩ
CF=47pF

500

400

300

200

-40 -20 0 20 40 60 80

-60

AMBIENT TEMPERATURE Ta(°C)

100

OSCILLATOR FREQUENCY VS.

120

AMBIENT TEMPERATURE

110

100

90

80

-40 -20 0 20 40 60 80

-60
AMBIENT TEMPERATURE Ta(°C)

ON duty VS. AMBIENT TEMPERATURE

100

90
80
70
60
50
40
30
20
10

0

-40 -20 0 20 40 60 80

-60
AMBIENT TEMPERATURE Ta(°C)

RON=24kΩ
ROFF=20kΩ
CF=330pF

100

(fOSC=100kHz)

100

ON duty VS. AMBIENT TEMPERATURE

100

90
80
70
60
50
40
30
20
10

0

-40 -20 0 20 40 60 80

-60
AMBIENT TEMPERATURE Ta(°C)

(fOSC=200kHz)

100

ON duty VS. AMBIENT TEMPERATURE

100

90
80
70
60
50
40
30
20
10

0

-40 -20 0 20 40 60 80

-60
AMBIENT TEMPERATURE Ta(°C)

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7

(fOSC=500kHz)

100