M51995AP MITSUBISHI, M51995AP Datasheet

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M51995AP

Manufacturer Part Number
M51995AP
Description
Switching regulator control
Manufacturer
MITSUBISHI
Datasheet

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Company
Part Number
Manufacturer
Quantity
Price
Company:
Bonase Electronics (HK) Co., Limited Bonase Electronics (HK) Co., Limited
Part Number:
M51995AP
Manufacturer:
MITSUBISHI
Quantity:
3 656
Price:
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
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
•Output current...............................................................±2A
•Output rise time 60ns,fall time 40ns
•Modified totempole output method with small through current
•Small start-up current............................................90µA typ.
•Big difference between "start-up voltage" and "stop voltage"
•Packages with high power dissipation are used to with-stand the
•High-speed current limiting circuit using pulse-by-pulse
•Protection by intermittent operation of output over current......
•Over-voltage protection circuit with an externally re-settable
•Protection circuit for output miss action at low supply
•Triangular wave oscillator for easy dead time setting
makes the smoothing capacitor of the power input section small.
..........................................................Timer protection circuit
latch(OVP)
voltage(UVLO)
High-performance and highly functional power supply
Compact and light-weight power supply
Start-up threshold 16V,stop voltage 10V
500kHz operation to MOS FET
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
method(Two system of CLM+pin,CLM-pin)
•T-ON pin resistance R
•T-OFF pin resistance R
ON
OFF
...........................10k to 75k
..........................2k to 30k
(
1
/ 27 )
PIN CONFIGURATION (TOP VIEW)
HEAT SINK PIN
COLLECTOR
COLLECTOR
EMITTER
EMITTER
SWITCHING REGULATOR CONTROL
ON/OFF
ON/OFF
MITSUBISHI (Dig./Ana. INTERFACE)
V
V
DET
DET
OVP
OVP
OUT
F/B
OUT
F/B
VF
VF
10
Outline 20P2N-A
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
9
Outline 16P4
Connect the heat sink pin to GND.
M51995AP/FP
16
15
14
13
12
11
10
20
19
18
17
16
15
14
13
12
11
9
Vcc
CLM+
CLM-
GND
CT
T-OFF
CF
T-ON
Vcc
CLM+
CLM-
GND
CT
T-OFF
CF
T-ON
HEAT SINK PIN

Related parts for M51995AP

M51995AP Summary of contents

Page 1

... VF 4 ON/OFF 5 OVP 6 DET 7 F/B 8 Outline 16P4 COLLECTOR OUT 3 EMITTER HEAT SINK PIN 6 7 ON/OFF 8 OVP 9 DET F/B 10 Outline 20P2N M51995AP/FP Vcc 16 CLM+ 15 CLM- 14 GND T-OFF T-ON Vcc 20 CLM+ 19 CLM- 18 GND 17 16 HEAT SINK PIN T-OFF T-ON Connect the heat sink pin to GND. ...

Page 2

... LATCH +CURRENT -CURRENT LIMIT LATCH LIMIT LATCH CLM- CLM+ +CURRENT LIMIT -CURRENT LIMIT Conditions Peak Continuous Ta=25˚C Ta>25˚ M51995AP/FP SWITCHING REGULATOR CONTROL F/B GND DET OP AMP 2.5V INTERMITTENT INTERMITTENT ACTION AND ACTION OSC CONTROL CT INTERMITTENT OPERATION DETERMINE CAPACITANCE Ratings 36 36 ± ...

Page 3

... Vcc=30V Vcc=18V C =4.7µ =3.3V,Ta=-5°C CT Ta=25°C Ta=85° 85°C V -=-0.1V CLM OUT -5 Ta 85°C V +=0V CLM OUT ( M51995AP/FP SWITCHING REGULATOR CONTROL Limits Min. Typ. Max. Vcc(STOP) 16.2 17.2 15.2 9.0 9.9 10.9 5.0 6 140 40 90 190 10 15 0.95 1 ...

Page 4

... F F Min off duty/Max on duty V =0.2V F 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 ( M51995AP/FP SWITCHING REGULATOR CONTROL 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 2.41 2 ...

Page 5

... OVP TERMINAL THRESHOLD VOLTAGE 1.1 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 - M51995AP/FP SWITCHING REGULATOR CONTROL (NORMAL OPERATION) =18k ON =20k OFF f =500kHz OSC f =100kHz OSC Ta=-30°C Ta=25°C Ta=85° SUPPLY VOLTAGE Vcc(V) (OFF STATE) Ta=25°C Ta=85° ...

Page 6

... AMBIENT TEMPERATURE Ta(° AND OFF DURATION OF TIMER 175 TIMER ON•••CIRCUIT OPERATION ON TIMER OFF••CIRCUIT OPERATION OFF 150 125 100 75 - 100 - M51995AP/FP SWITCHING REGULATOR CONTROL ON OFF OFF - AMBIENT TEMPERATURE Ta(°C) DISCHARGE CURRENT OF TIMER VS.AMBIENT TEMPERATURE 80 - VS.AMBIENT TEMPERATURE ...

Page 7

... OUTPUT SOURCE CURRENT I CLM ( M51995AP/FP SWITCHING REGULATOR CONTROL VS. AMBIENT TEMPERATURE - AMBIENT TEMPERATURE Ta(°C) CLM+ TERMINAL CURRENT VS. CLM+ TERMINAL VOLTAGE Ta=-30°C Ta=25°C Ta=85°C +(V) CLM OUTPUT HIGH VOLTAGE VS. ...

Page 8

... VS. F/B TERMINAL INPUT CURRENT 50 =100kHz) =20k 2.0 2.5 0 F/B TERMINAL INPUT CURRENT I (mA) F M51995AP/FP SWITCHING REGULATOR CONTROL DETECTION VOLTAGE VS. AMBIENT TEMPERATURE - AMBIENT TEMPERATURE Ta(°C) VS. FREQUENCY 1k 10k 100k 1M FREQUENCY f(Hz) ON duty (f =200kHz) OSC R =18k ON R =20k OFF Ta=-30° ...

Page 9

... R =24k ON R =20k OFF 600 C =330pF F 500 400 300 200 60 80 100 - M51995AP/FP SWITCHING REGULATOR CONTROL VS. AMBIENT TEMPERATURE R =18k ON R =20k OFF f =500kHz OSC f =200kHz OSC f =100kHz OSC f =100kHz OSC f =200kHz OSC f =500kHz OSC -40 - AMBIENT TEMPERATURE Ta(°C) ON duty VS. R ...

Page 10

... OVP TERMINAL INPUT VOLTAGE VS. 1m =500kHz) =27k OFF =24k OFF 100µ =22k OFF =20k OFF =12k OFF =6.2k OFF 10µ 1µ 0 OVP TERMINAL INPUT VOLTAGE M51995AP/FP SWITCHING REGULATOR CONTROL (f =200kHz) OSC - AMBIENT TEMPERATURE Ta(°C) EXPANSION RATE OF PERIOD (f =100kHz) OSC 1 R =15k,R ...

Page 11

... CURRENT FROM OVP TERMINAL FOR OVP RESET VS. SUPPLY VOLTAGE 800 700 600 500 Ta=-30°C Ta=25°C 400 Ta=85°C 300 200 100 SUPPLY VOLTAGE Vcc( M51995AP/FP SWITCHING REGULATOR CONTROL ...

Page 12

... FUNCTION DESCRIPTION Type M51995AP and M51995AFP are especially designed for off-line primary PWM control IC of switching mode power supply (SMPS) to get DC voltage from AC power supply. Using this IC,smart SMPS can be realized with reasonable cost and compact size as the number of external electric ...

Page 13

... The cycle time of oscillation is given by the summation of Equations 2 and 4. The frequency including the dead-time is not influenced by the temperature because of the built-in temperature compensating circuit MITSUBISHI (Dig./Ana. INTERFACE) M51995AP/FP SWITCHING REGULATOR CONTROL current and one OFF current by the function of Q2,Q3 and 1/16 ...

Page 14

... Fig.8 Feedback loop with low pass filter from output choke coil will continue at over load condition,it means the "continuous current" condition. Fig.8 shows one of the examples for VF terminal application for the feed forward type regulator M51995AP/FP SWITCHING REGULATOR CONTROL OSCH 4.4V OSCL 2. ...

Page 15

... POINT B TO LATCH OUTPUT POINT C FROM OSC OSC WAVEFORM OF CF TERMINAL WAVEFORM OF CLM- TERMINAL ( / M51995AP/FP SWITCHING REGULATOR CONTROL OSC WAVEFORM OF CF TERMINAL ~ V THCLM WAVEFORM OF CLM+ TERMINAL CURRENT LIMIT SIGNAL TO SET LATCH WAVEFORM OF V TERMINAL OUT ...

Page 16

... Therefore the parts in power circuit including secondary rectifier diodes are protected from the overheat by the over current. Fig.14 Block diagram of intermittent action circuit ( M51995AP/FP SWITCHING REGULATOR CONTROL (b) Without current limit signal of about 3V,so the CT terminal voltage is THTIME THTIME is charged up by the current of ...

Page 17

... Q4 "off" As the constant current source connected to Q4 base terminal has such the hysteresis characteristics of 20µA at operation and 3µA at stopping.So the unstable operation is not appeared even if the ON/OFF terminal voltage signal varies slowly M51995AP/FP SWITCHING REGULATOR CONTROL 500 F/B DET 5 ...

Page 18

... Vcc lower than the OVP reset supply voltage. As the OVP reset voltage is settled on the rather high voltage of 9.0V,SMPS can be reset in rather short time from the switch-off of the AC power source if the smoothing capacitor is not so large value M51995AP/FP SWITCHING REGULATOR CONTROL charging BE of Q3. ...

Page 19

... Vcc The Vcc voltage is recommended to be 12V to 17V as the normal and optimum gate voltage 15V and the output voltage type M51995AP/FP is about(Vcc-2V M51995AP/FP ...

Page 20

... IC operation start and stop must be settled at the specified values. The input voltage(V ),at which the IC operation starts,is IN(START) decided by R1 and R2 utilizing the low start-up current characteristics of type M51995AP/FP. The input voltage(V ),at which the IC operation stops,is IN(STOP) decided by the ratio of third winding of transformer. The V and V are given by following equations ...

Page 21

... For the over voltage protection (OVP),the induced fly back type third winding voltage can be utilized,as the induced third PHOTO COUPLER winding voltage depends on the output voltage.Fig.30 shows one of the example circuit diagram M51995AP/FP SWITCHING REGULATOR CONTROL R1 C FIN R2 THE TIME CONSTANT OF THIS PART SHOULD BE SHORT Fig ...

Page 22

... VF terminal.When the current limiting circuit operates under the over current condition,the oscillating frequency decreases in accordance with the decrease of VF terminal voltage,if the VF is lower than 3.5V.And also the dead time becomes longer M51995AP/FP SWITCHING REGULATOR CONTROL I2 CLM R CLM I1 (a) Feed forward system ...

Page 23

... V THTIME If the charged-up CT terminal voltage is applied to OVP terminal through the level-shifter consisted of buffer transistor and resistor,it makes type M51995A keep non-operating condition M51995AP/FP SWITCHING REGULATOR CONTROL POINT THAT Vcc VOLTAGE OR THIRD WINDING VOLTAGE DECREASES UNDER "OPERATION-STOP VOLTAGE" DC OUTPUT CURRENT in Fig.38,it is noticed that ...

Page 24

... To use the buffer circuit shown next section (3)Output buffer circuit It is recommended to use the output buffer circuit as shown in Fig.42,when type M51995A drives the large capacitive load or bipolar transistor. as the GS affect to the ( / MITSUBISHI (Dig./Ana. INTERFACE) M51995AP/FP SWITCHING REGULATOR CONTROL V =80V DS V =200V DS V =320V DS 3 ...

Page 25

... Fig.46.If this circuit is used,the synchronization may be out of order at the overload condition when the current limiting function starts to operate and VF terminal voltage becomes lower than 3V M51995AP/FP SWITCHING REGULATOR CONTROL .Not to superpose,R1 is connected (START) F/B M51995A TO PHOTO COUPLER How to get the narrow pulse width Fig ...

Page 26

... V OUT EMITTER Vcc M51995A GND Fig.48 Driver circuit diagram (2) for bipolar transistor Fig.49 Through current waveform of totempole driver ( / M51995AP/FP SWITCHING REGULATOR CONTROL COLLECTOR V OUT EMITTER H-Axis : 20ns/div V-Axis : 50mA/div AT RISING EDGE OF OUTPUT PULSE H-Axis : 20ns/div V-Axis : 10mA/div AT RISING EDGE OF OUTPUT PULSE ...

Page 27

... APPLICATION EXAMPLE Feed forward types SMPS with multi-output FIN V OUT VF SWITCHING REGULATOR CONTROL R1 COLLECTOR Vcc M51995AP ON/OFF OFF MITSUBISHI (Dig./Ana. INTERFACE) M51995AP/ Cvcc OVP F/B V OUT2 V OUT1 ON/OFF ...

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