TL5001, TL5001A
PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS084F – APRIL 1994 – REVISED JANUARY 2002
APPLICATION INFORMATION
V
5 V
I
R1
470 Ω
+
C1
100 µF
10 V
Q1
TPS1101
GND
L1
20 µH
3.3 V
GND
C3
0.1 µF
CR1
MBRS140T3
+
C2
2
100 µF
V
C4
1 µF
CC
10 V
1
5
SCP
V
O
+
C5
0.1 µF
3
4
COMP
U1
TL5001/A
R7
2.0 kΩ
R5
7.50 kΩ
1%
C6
0.012 µF
R2
56 kΩ
6
7
C7
0.0047 µF
DTC
R4
5.1 kΩ
R3
43 kΩ
FB
RT
R6
3.24 kΩ
1%
GND
8
Partial Bill of Materials:
U1
Q1
LI
TL5001/A
TPS1101
CTX20-1 or
Texas Instruments
Texas Instruments
Coiltronics
23 turns of #28 wire on
Micrometals No. T50-26B core
TPSD107M010R0100
TPSD107M010R0100
MBRS140T3
C1
C2
CR1
AVX
AVX
Motorola
NOTES: A. Frequency = 200 kHz
B. Duty cycle = 90% max
C. Soft-start time constant (TC) = 5.6 ms
D. SCP TC = 70 msA
Figure 21. Step-Down Converter
17
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TI [ TEXAS INSTRUMENTS ]
