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参数资料
| 型号： | TPS65230DCA |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO48 |
| 封装： | HTSSOP-48 |
| 文件页数： | 9/26页 |
| 文件大小： | 899K |
| 代理商： | TPS65230DCA |
INDUCTOR SELECTION
L =
V
-V
IN(MAX)
OUT
0.3
IOUT
V
OUT
V
IN(MAX)
1
f
SW
(4)
www.ti.com.................................................................................................................................... SLVSA10A – SEPTEMBER 2009 – REVISED SEPTEMBER 2009
Figure 10. Sample Schematic for TPS6523x Showing Components Relevant to BUCK1
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
VIN
Input supply voltage
10.8
12
13.2
V
VIN RIPPLE
Input voltage ripple
IOUT, BUCK1 = 6 A
60
mV
VOUT
Output Voltage
4.75
5
5.25
V
Line regulation
VIN = 10.8 V to 13.2 V
25
mV
Load regulation
IOUT, BUCK1 = 0 A to 6 A
25
mV
VOUT RIPPLE
Output ripple
IOUT, BUCK1 = 6 A
50
mV
VTRANS
Transient deviation
IOUT, BUCK1 = 2 A to 6 A
125
mV
IOUT
Output current
VIN = 10.8 V to 13.2 V
0
6
A
fSW
Switching frequency
500
kHz
For BUCK1 the recommended inductor value is 4.7
H and for BUCK2 and 3 it is 2.2 H. These values will
provide a good balance between ripple current, efficiency, loop bandwidth and inductor cost. The inductor is
typically sized for < 30% peak-to-peak ripple current (IRIPPLE). Given this target ripple current, the required
inductor size is calculated by Equation 4.
Solving Equation 4 with VIN(MAX) = 13.2 V, an inductor value of 3.5 H is obtained. A standard value of 4.7 H is
selected, resulting in 1.25-A peak-to-peak ripple. The RMS current through the inductor is approximated by
Copyright 2009, Texas Instruments Incorporated
17
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