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Part: M51996AP
Category:
Power Management
-> Regulators
-> Switching Regulators
Description: Switching Regulator Control
Company: Mitsubishi Electronics America, Inc.
Datasheet: Download M51996AP datasheet File size : 10010 kB
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Datasheet text preview:
MITSUBISHI (Dig./Ana. INTERFACE)
M51996AP/FP
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. COLLECTOR VOUT EMITTER OVP F/B DET
1 2 3 4 5 6 7 14 13 12 11 10 9 8
PIN CONFIGURATION (TOP VIEW)
Vcc CLM+ GND T-OFF CF T-ON
REG
SOFT
Outline 14P4
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 Connect the heat sink pin to GND. COLLECTOR VOUT EMITTER HEAT SINK PIN OVP F/B DET
1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9
Vcc CLM+ GND HEAT SINK PIN T-OFF CF T-ON SOFT
REG
Outline 16P2N-A
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 75k ·T-OFF pin resistance ROFF..2k to 30k
( 1 / 22 )
MITSUBISHI (Dig./Ana. INTERFACE)
M51996AP/FP
SWITCHING REGULATOR CONTROL BLOCK DIAGRAM
REG(7.8V) 7.1V 5.8V 3K 500 6S DET UNDER VOLTAGE LOCK OUT
OP AMP
F/B
VCC
VOLTAGE REGULATOR
15.2K 1S
1S
1S 2.5V
OVP
LATCH
PWM COMPARATOR
PWM LATCH
COLLECTOR VOUT EMITTER
CF
OSCILLATOR
T-ON
(TRIANGLE)
CURRENT LIMIT DETECTION
T-OFF
SOFT
CLM+
GND
ABSOLUTE MAXIMUM RATINGS
Symbol VCC VC IO IVREG VSOFT VCLM+ VDET IOVP IFB ITON ITOFF Pd K Topr Tstg Parameter Supply voltage 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 Conditions Ratings 31 31 ±1 ±0.15 -6 VREG +0.2 -0.3 to +3 6 8 -10 -1 -2 1.5 12 -30 to +85 -40 to +125 Unit V V A mA V V V mA mA mA mA W mW/°C °C °C
Ta=25°C Ta>25°C
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.
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MITSUBISHI (Dig./Ana. INTERFACE)
M51996AP/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 6.3 100 100 11 12 2.0 210 -1.5 -0.6 -0.99 5.9 600 750 30 150 150 9.0 1.20 -320 -140 200 -200 100 188 50 4.37 1.96 2.41 4.5 3.5 188 131 23.3 -0.1 3.3 7.8 0.04 0.7 0.85 1.3 16.7 16.5 60 40 2.5 1.0 40
Operating supply voltage range VCC VCC(START) Operation start up voltage VCC(STOP) Operation stop voltage 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 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
15.2 9.0 Vcc=Vcc(START) -Vcc(STOP) Vcc=14.5V,Ta=25°C Vcc=14.5V,-30Ta85°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 5.0 65 50 7.3 8 1.3 140 -2.1 -0.9 -1.35 4.9 420 540 80 80 7.5 0.55 -480 -210 180 -280 170 47 3.97 1.76 2.11 RON=20k ROFF=17k 3.8 2.9 170 111 19.0 -0.5 1 6.8 Vcc=18V,Io=10mA Vcc=18V,Io=100mA Vcc=5V,Io=1mA Vcc=5V,Io=100mA Vcc=18V,Io=-10mA Vcc=18V,Io=-100mA
Max. 30 17.2 10.9 7.6 150 200 17 19 3.0 320 -1.0 -0.4 -0.70 7.1 780 960 250 250 10.0
Unit V V V V µA mA mA µA mA mA mA V mV mV µA µA V V
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 Oscillating frequency during SOFT operation SOFT terminal input current SOFT terminal discharging current Regulator output voltage VSOFT=5.5V VSOFT=2.5V VSOFT=0.2V
VTHOVP=VTHOVPH-VTHOVPL VOVP=400mV OVP terminal is open. (high impedance) Vcc=30V Vcc=18V VCLM+=0V RON=20k,ROFF=17k CF=220pF,-5Ta85°C RON=20k,ROFF=17k CF=220pF
-213 -93 220 -140 207 53 4.77 2.16 2.71 5.4 4.2 207 151 27.0
µA mV µA ns kHz % V V V V V kHz µA mA
VT-ON VT-OFF
fOSCSOFT ISOFTIN ISOFDIS
RON=20k,ROFF=17k CF=220pF VSOFT=1V Discharge current of SOFT terminal at Vcc less than Vcc(STOP)
VREG
VOL1 VOL2 VOL3 VOL4 VOH1 VOH2 TRISE TFALL VDET IINDET GAVDET
Output low voltage
8.8 0.4 1.4 1.0 2.0
Output high voltage Output voltage rise time Output voltage fall time Detection voltage DET terminal input current Voltage gain of detection amp
16.0 15.5
V V V V V V V ns ns V µA dB
2.4 VDET=2.5V 30
2.6 3.0
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