SM74202 Datasheet, PDF (9/12 Pages) Texas Instruments – 100V Current Mode PWM Controller

SM74202
www.ti.com
SNOSBA4A – NOVEMBER 2011 – REVISED APRIL 2013
Thermal Protection
Internal thermal shutdown circuitry is provided to protect the integrated circuit in the event the maximum junction
temperature is exceeded. This feature prevents catastrophic failures from accidental device overheating. When
activated, typically at 165 degrees Celsius, the controller is forced into a low power standby state, disabling the
output driver and the bias regulator. After the temperature is reduced (typical hysteresis = 25°C) the V_CC
regulator is enabled and a softstart sequence initiated.
Typical Application Circuit: 36V - 75 V_IN and 3.3V, 4.5A OUT
J1
V+
30-75V IN
1
2
GND
GND
C1
2.2 PF
C2
2.2 PF
R2
61.9k
C9
GND
0.1 PF
R13
20
D2
CMPD2838E
R1
10
GND
Z1
1SMB5936B
C12
R10 ^{470 pF}
J2
+3.3V
2
T1
10, 1W
1
D3
MBRD835L
C13
C14
C15
100 PF 100 PF 270 PF
OUT RTN
GND
GND GND GND
GND
Shutdown
GND
C4
0.1 PF
C10
4.7 PF
D1
CMPD2838E
GND
C3
0.01 PF
R3
2.87k
GND
GND
R4
1.00k
GND GND
U1
1
VIN VCC
7
UVLO
OUT
C6
220 pF
SYNC
Input
R5
15.0k
C8
100 pF
C7
3300 pF
3 _COMP
CS
9
10
RT/
SYNC
FB
SS ^GND
R6
12.4k
SM74202
C5
0.01 PF
GND GND
4
5
8
2
6
GND
R7
100
R8
0.47
C11
1000 pF
GND
Q1
Si7898DP
R9
0.47
GND
R11
2.43k
R12
1.47k
GND
Bill Of Materials
ITEM
C
1
C
2
C
3
C
4
C
5
C
6
C
7
C
8
C
9
C
10
C
11
C
12
C
13
C
14
C
15
D
1
PART NUMBER
C4532X7R2A225M
C4532X7R2A225M
C2012X7R1H103K
C3216X7R2A104K
C2012X7R1H103K
C2012C0G1H221J
C2012C0G1H332J
C2012C0G1H101J
C2012X7R1H104K
C3216X7R1C475K
C2012C0G1H102J
C2012C0G1H471J
C4532X7S0G107M
C4532X7S0G107M
A700X277M0004AT
CMPD2838E-NSA
DESCRIPTION
CAPACITOR, CER, TDK
CAPACITOR, CER, TDK
CAPACITOR, CER, TDK
CAPACITOR, CER, TDK
CAPACITOR, CER, TDK
CAPACITOR, CER, KEMET
CAPACITOR, CER, TDK
CAPACITOR, CER, TDK
CAPACITOR, CER, TDK
CAPACITOR, CER, TDK
CAPACITOR, CER, TDK
CAPACITOR, CER, TDK
CAPACITOR, CER, TDK
CAPACITOR, CER, TDK
CAPACITOR, ALUM ORGANIC, KEMET
DIODE, SIGNAL, CENTRAL
VALUE
2.2µF, 100V
2.2µF, 100V
0.01µF, 50V
0.1µF, 100V
0.01µF, 50V
220pF, 50V
3300pF, 50V
100pF, 50V
0.1µF, 50V
4.7µF, 16V
1000pF, 50V
470p, 50V
100µF, 4V
100µF, 4V
270µF, 4V
Copyright © 2011–2013, Texas Instruments Incorporated
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