參數(shù)資料
型號(hào): TPS2341PHPR
廠商: TEXAS INSTRUMENTS INC
元件分類(lèi): 電源管理
英文描述: 4-CHANNEL POWER SUPPLY SUPPORT CKT, PQFP48
封裝: POWERPAD, HTQFP-48
文件頁(yè)數(shù): 22/31頁(yè)
文件大小: 649K
代理商: TPS2341PHPR
TPS2341
SLUS513A MAY 2003 REVISED JULY 2004
29
www.ti.com
APPLICATION INFORMATION
+12-V Supply
Gate Capacitance
IINRUSH ≤ 0.79 A from a minimum +12-V overcurrent threshold voltage.
ICLOAD = IINRUSH ILOAD = 0.79 A 0.5 A = 290 mA
from i = C dV/dt for the load capacitance and charge current:
T = V (C/i)
+ 12 V
300
mF
290 mA
+ 12.4 ms
from i = C dV/dt for the gate capacitance and charge current: C = i
× ( T/V)
+ 14 mA 12.4 ms
12 V
using the maximum gate capacitance and charge current
= 0.014
F ∴ choose 0.02 F, 10% capacitor.
The nominal load turn-on time is calculated in equation (17).
DT + DV(C i) + 12 V
0.02
mF
5
mA
+ 48 ms
SR
+ 12 V
48 ms
+ 250 V s
12-V Supply
Gate Capacitance
IINRUSH ≤ 150 mA from minimum 12-V overcurrent threshold voltage.
ICLOAD = IINRUSH ILOAD = 150 mA 100 mA = 50 mA
from i = C dV/dt for the load capacitance and charge current:
T = V (C/i)
+ 12 V
150
mF
50 mA
+ 36 ms
from i = C dV/dt for the gate capacitance and charge current: C = i
× ( T/V)
+ 25 mA 36 ms
12 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 (21).
DT + DV(C i) + 12 V
0.1
mF
20
mA +
60 ms
SR
+ 12 V
60 ms
+ 200 V s
(15)
(16)
(17)
(18)
(19)
(20)
(21)
(22)
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