參數(shù)資料
型號: TPS2341PHPR
廠商: TEXAS INSTRUMENTS INC
元件分類: 電源管理
英文描述: 4-CHANNEL POWER SUPPLY SUPPORT CKT, PQFP48
封裝: POWERPAD, HTQFP-48
文件頁數(shù): 20/31頁
文件大?。?/td> 649K
代理商: TPS2341PHPR
TPS2341
SLUS513A MAY 2003 REVISED JULY 2004
27
www.ti.com
Determining Component Values
Load Conditions
Table 5. Load Conditions for Determining Component Values
SUPPLY DRIVER
ILOAD
(A)
ITRAP
(A)
CLOAD
(
F)
SR
(V/s)
+12 V
0.5
0.94
300
250
+5 V
5
7.0
3000
200
+3.3 V
7.6
10.0
3000
200
12 V
0.1
0.19
150
200
+3.3 Vaux
0.375
1.0
150
5000
+3.3 Vaux(1)
0.02
0.04
150
100
(1)
+3.3Vaux turn-on from stand-by power.
+3.3-V Supply
Overload Trip Point
Desired ITRIP (nom) 10 A
R
SENSE +
V
RTRIP (nom)
I
TRIP (nom)
+ 52 mV
10 A
+ 0.0052 W NChoose 5 mW, 2% sense resistor
I
TRIP(min) +
V
TRIP (min)
R
SENSE (max)
+ 44 mV
5.1 m
W +
8.63 A
I
TRIP(max) +
V
TRIP (max)
R
SENSE (min)
+ 60 mV
4.9 m
W +
12.2 A
Gate Capacitance
IINRUSH ≤ 8.6 A
ICLOAD = IINRUSH ILOAD = 8.6 A 7.6 A = 1 A
from i = C dV/dt for the load capacitance and charge current:
T = V (C/i)
+ 3.3 V
3000
mF
1A
+ 9.9 ms
from i = C dV/dt for the gate capacitance and charge current: C = i
× ( T/V)
+ 25 mA 9.9 ms
3.3 V
using the maximum gate capacitance and charge current
= 0.075
F ∴ choose 0.1 F, 10% capacitor.
The nominal load turn-on time is calculated in equation (8).
DT + DV(C i) + 3.3 V
0.1
mF
20
mA +
16.5 ms
SR
+ 3.3 V
16.5 ms
+ 200 V s
(3)
(4)
(5)
(6)
(7)
(8)
(9)
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