Datasheet

TPS5103
MULTIPLE MODE SYNCHRONOUS DC/DC CONTROLLER
SLVS240A – SEPTEMBER 1999 – REVISED MAY 2001
35
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
High-current applications are described in Table 8. The values are recommendations based on actual test
circuits. Many variations are possible based on the requirements of the user. Performance of the circuit is
dependent upon the layout rather than on the specific components, if the device parameters are not exceeded.
The power stage, having the highest current levels and greatest dv/dt rates, should be given the most attention,
as both the supply and load can be severely affected by the power levels and edge rates.
Table 8. High-Current Applications
REFERENCE
DESIGNATIONS
Operational
Conditions
FUNCTION 8-A OUTPUT 12-A OUTPUT 16-A OUTPUT
C1 Input-bulk capacitor
2x ELNA
RV-35V221MH10-R
220 µF, 35 V
3x ELNA
RV-35V221MH10-R
220 µF, 35 V
4x ELNA
RV-35V221MH10-R
220 µF, 35 V
C2 Input-bypass capacitor
2x Taiyo Yuden
GMK325F106ZH
10 µF, 35 V
3x Taiyo Yuden
GMK325F106ZH
10 µF, 35 V
4x Taiyo Yuden
GMK325F106ZH
10 µF, 35 V
C6
0.01 µΩ at
V
I
= 4.5 V to 10 V
L1 Output-filter indicator
Coiltronics UP3B-2R2
2.2 µH, 9.2 A
Coiltronics UP4B-1R5
1.5 µH, 13.4 A
MicorMetals T68-8/90
Core w/7T, #16
1.0 µH, 25 A
C3 Output-filter capacitor
2x Sanyo 4TPB470M
470 µF, 4 V
3x Sanyo 4TPB470M
470 µF, 4 V
4x Sanyo 4TPB470M
470 µF, 4 V
Q1 Power switch
2x Siliconix Si4410DY
30 V, 10 A, 13 mΩ
3x Siliconix Si4410DY
30 V, 10 A, 13 mΩ
4x Siliconix Si4410DY
30 V, 10 A, 13 mΩ
Q2 Power switch
2x Siliconix Si4410DY
30 V, 10 A, 13 mΩ
3x Siliconix Si4410DY
30 V, 10 A, 13 mΩ
4x Siliconix Si4410DY
30 V, 10 A, 13 mΩ
R3
910 kΩ at
V
I
= 4.5 V to 10 V
R3
10 kΩ at
V
I
= 10 V to 25 V
R4
1.74 kΩ at
V
I
= 4.5 V to 10 V
R4
19 kΩ at
V
I
= 10 V to 25 V
R5
5.1 kΩ at
V
I
= 4.5 V to 25 V
R11 Gate-drive resistor 7 Ω 5 Ω 4 Ω
R12 Current-limit resistor 10 kΩ 15 kΩ 20 kΩ
Switching
frequency
200 kHz 150 kHz 100 kHz