Datasheet

 
  
  
SLVS224B − NOVEMBER 1999 − REVISED AUGUST 2002
10
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
Figure 17 shows the circuit schematic of a 100-kHz synchronous-buck converter implemented with a TL5001A
pulse-width-modulation (PWM) controller and a TPS2837 driver. The converter operates over an input range from
4.5 V to 12 V and has a 3.3-V output. The circuit can supply 3 A continuous load and the transient load is 5 A. The
converter achieves an efficiency of 94% for V
IN
= 5 V, I
load
=1 A, and 93% for V
IN
= 5 V, I
load
= 3 A.
C14
1 µF
R9
90.9 kΩ
R8
121 kΩ
C9
0.22 µF
V
CC
RT
FB
COMP
GND
OUT
DTC
SCP
U2
TL5001A
1
2
6
5
8
3
4
7
C1
1 µF
R10
1.0 kΩ
R2
1.6 kΩ
C2
0.033 µF
C3
0.0022 µF
C8
0.1 µF
C4
0.022 µF
R3
180 Ω
R4
2.32 kΩ
GND
Q2
Si4410
R7
3.3 Ω
C6
1000 pF
V
IN
C5
100 µF
C10
100 µF
C11
0.47 µF
3.3 V
C13
10 µF
C7
100 µF
C12
100 µF
Q1
Si4410
L1
27 µH
U1
TPS2837
R1
1 kΩ
C15
1.0 µF
R5
0 Ω
R11
4.7 Ω
RTN
PGND
LOWDR
BOOTLO
HIGHDR
BOOT
IN
DT
V
CC
1
2
3
4
8
7
6
5
+
+
+
+
R6
1 MΩ
Figure 17. 3.3 V 3 A Synchronous-Buck Converter Circuit