LTC1643H Просмотр технического описания (PDF) - Linear Technology
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LTC1643H Datasheet PDF : 16 Pages
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LTC1643L/LTC1643L-1/LTC1643H
APPLICATIONS INFORMATION
SYSTEM
POWER
SUPPLY
R2
Q2
1 0.005Ω 2 IRF7413
3
4
R5
10Ω
R1
Q1
1 0.007Ω 2 IRF7413
3
4
R6
10Ω
R7
100Ω
9
10
11
3
13
12
PCI
POWER
SYSTEM
CONTROLLER
8
3VIN
GND
1
2
12VIN
VEEIN
3VSENSE GATE 3VOUT 5VIN
5VSENSE
5
ON
R3
LTC1643H
10k 6
FAULT
R4
10k 7 PWRGD
RESET
14
5VOUT
16
12VOUT
15
VEEOUT
4
TIMER
Figure 1. Typical Application
5V
5A
3.3V
7.6A
GND
C1
0.047µF
12V
500mA
–12V
100mA
C2
0.1µF
LOGIC
RESET
1643 F01
ON
10V/DIV
TIMER
10V/DIV
GATE
10V/DIV
12VOUT
5V/DIV
5VOUT
5V/DIV
3VOUT
5V/DIV
VEEOUT
5V/DIV
ON
10V/DIV
TIMER
10V/DIV
GATE
10V/DIV
12VOUT
5V/DIV
5VOUT
5V/DIV
3VOUT
5V/DIV
VEEOUT
5V/DIV
FAULT
10V/DIV
PWRGD
10V/DIV
10ms/DIV
Figure 2. Normal Power-Up Sequence
10
FAULT
10V/DIV
PWRGD
10V/DIV
1643 F02
10ms/DIV
1643 F03
Figure 3. Normal Power-Down Sequence
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