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Part: M51995
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Datasheet: Download M51995 datasheet File size : 1221 kB
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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 resettable OVP(over voltage protection)circuit. COLLECTOR VOUT 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+ CLMGND 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 VOUT EMITTER VF
1 2 3 4 5
20 19 18 17 16
Vcc CLM+ CLMGND 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 RON...10k to 75k ·T-OFF pin resistance ROFF..2k to 30k
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MITSUBISHI (Dig./Ana. INTERFACE)
M51995AP/FP
SWITCHING REGULATOR CONTROL BLOCK DIAGRAM
VCC 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
VOUT 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 VCC VC IO VVF VON/OFF VCLMVCLM+ IOVP VDET IDET VFB ITON ITOFF Pd K Topr Tstg Tj Parameter Supply voltage 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 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.
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MITSUBISHI (Dig./Ana. INTERFACE)
M51995AP/FP
SWITCHING REGULATOR CONTROL ELECTRICAL CHARACTERISTICS (VCC=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 VCC VCC(START) Operation start up voltage VCC(STOP) Operation stop voltage 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 VTHCLMIINCLMTPDCLMVTHCLM+ IINCLM+ TPDCLM+ 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,-30Ta85°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 IFB=IFBMIND-IFBMAXD F/B terminal input current=0.95mA -2.1 -0.90 -1.35 4.9 420 2.4 30 540 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 -5Ta85°C VCLM-=-0.1V -5Ta85°C VCLM+=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 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 VOUT CLM+ terminal threshold voltage CLM+ terminal current Delay time from CLM+ to VOUT
VDET=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
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