M51996AP_37412

Block Symbol
Parameter
VCC
Operating supply voltage range
VCC(START) Operation start up voltage
VCC(STOP) Operation stop voltage
Test conditions
Limits Unit
Min. Typ. Max.
nect the heat sink pin to GND.
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
F/B
VCC
7.1V
5.8V
3K
500
15.2K 1S
6S
1S
1S
OP AMP 2.5V
PWM COMPARATOR
PWM LATCH
CURRENT LIMIT DETECTION
DET
COLLECTOR VOUT EMITTER
CLM+
GND
ABSOLUTE MAXIMUM RATINGS
Symbol VCC VC
Unit V V
A
mA V V V mA mA mA mA W mW/˚C ˚C ˚C
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MITSUBISHI (Dig./Ana. INTERFACE)
M51996AP/FP
SWITCHING REGULATOR CONTROL
ELECTRICAL CHARACTERISTICS (VCC=18V, Ta=25°C, unless otherwise noted)
Vcc(STOP)
30
V
15.2 16.2 17.2 V
9.0
9.9 10.9
V
∆Vcc
Vcc(START),Vcc(STOP) difference
∆Vcc=Vcc(START) -Vcc(STOP)
5.0
6.3 7.6
V
IccL
Stand-by current
IccO
Operating circuit current
Difference supply voltage between operation stop and OVP reset
Current from OVP terminal for OVP reset
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
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
OVP
VOLTAGE REGULATOR
UNDER VOLTAGE LOCK OUT
LATCH
CF T-ON T-OFF
OSCILLATOR (TRIANGLE)
SOFT
MITSUBISHI (Dig./Ana. INTERFACE)
M51996AP/FP
SWITCHING REGULATOR CONTROL
IccOVP Circuit current in OVP state
IFBMIND IFBMAXD
∆IFB VFB RFB VTHOVPH ∆VTHOVP ITHOVP IINOVP VCCOVPC VCC(STOP) -VCCOVPC
ITHOVPC
Current at 0% duty Current at maximum duty
∆VTHOVP=VTHOVPH-VTHOVPL
VOVP=400mV
OVP terminal is open. (high impedance)
Vcc=30V Vcc=18V
65 100 150
50
100 200
µA
7.3
11
8
12
17 19
mA
1.3
2.0
3.0
mA
140 210 320 µA
-2.1 -1.5 -1.0 mA
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
MITSUBISHI (Dig./Ana. INTERFACE)
M51996AP/FP
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.
•T-ON pin resistance RON...........................10k to 75kΩ •T-OFF pin resistance ROFF..........................2k to 30kΩ
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BLOCK DIAGRAM
REG(7.8V)
SWITCHING REGULATOR CONTROL
PIN CONFIGURATION (TOP VIEW)
COLLECTOR 1 VOUT 2
EMITTER 3 OVP 4 F/B 5 DET 6 REG 7
14 Vcc 13 CLM+ 12 GND 11 T-OFF 10 CF 9 T-ON 8 SOFT
Outline 14P4
COLLECTOR 1 VOUT 2
EMITTER 3 HEAT SINK PIN 4
OVP 5 F/B 6 DET 7
REG 8
16 Vcc 15 CLM+ 14 GND 13 HEAT SINK PIN 12 T-OFF 11 CF 10 T-ON 9 SOFT
Outline 16P2N-A
Conditions Peak Continuous
Ta=25˚C Ta>25˚C
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
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.
-0.9 -0.6 -0.4 mA
-1.35 -0.99 -0.70 mA
4.9 5.9 7.1
V
420 600 780
Ω
540 750 960 mV
30
mV
80 150
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