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參數(shù)資料
| 型號(hào)： | LTC1643LCGN#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 4-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SSOP-16 |
| 文件頁(yè)數(shù)： | 6/16頁(yè) |
| 文件大?。?/td> | 278K |
| 代理商： | LTC1643LCGN#TR |
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LTC1643L/LTC1643L-1/LTC1643H
R2
0.005
Q2
IRF7413
Q1
IRF7413
R1
0.007
R5
10
R6
10
R8
100k
R7
100
C1
0.047
F
5V
5A
12V
1.5A
3.3V
7.6A
GND
R3
10k
R4
10k
11
3
13
12
16
15
4
10
9
8
1
2
5
6
7
3VIN
GND
ON
FAULT
PWRGD
3VSENSE
5VSENSE
3VOUT
LTC1643H
12VOUT
VEEOUT
TIMER
5VIN
GATE
1643 F08
SYSTEM
POWER
SUPPLY
PCI
POWER
SYSTEM
CONTROLLER
C2
0.1
F
C3
0.1
F
R10
200
R9
200
Q5
TP0610T
Q6
Si9410DY
Q4
Si9400
Q3
TP0610T
D1
1N4148
12VIN
VEEIN
–12V
1.5A
4
3
2
1
4
3
2
1
10
Figure 8. Increasing 12V and – 12V Current Capability
APPLICATIONS INFORMATION
WU
U
For the 12V supply, P-channel transistor Q4 is placed in
parallel with the internal switch. When the LTC1643H is
turned off, the GATE pin is held low and transistor Q3 is
turned on which pulls the gate of Q4 high, turning it off.
When the LTC1643H is turned on, the GATE pin goes high,
turning off Q3 and allowing R8 to pull the gate of Q4 low
to turn it on.
Because Q4 is in parallel with the internal 12V switch, the
load current will be shared in proportion to their respective
RDS(ON) values. For example, if the RDS(ON) of the external
switch is 0.2
and the internal switch is 0.4, then, at
1.5A load current, the external switch will provide 1A and
the internal switch 500mA. The circuit breaker current will
be reached when the internal current reaches 1A and the
external current is 2A or 3A load current.
For the –12V supply, N-channel transistor Q6 is used to
provide the extra load current. When the LTC1643H is
turned on, the internal VEE switch is turned on and the
–12V output starts to pull down through D1 and turns on
Q5. When Q5 turns on, the gate of Q6 starts to rise, turning
it on. When the LTC1643H turns off, the VEEOUT pin is
pulled up to ground, diode D1 is reversed biased, and
transistor Q5 turns off, which allows resistor R10 to turn
off Q6.
The internal –12V switch provides the current limit for the
supply, but because the high RDS(ON) of the internal switch
(1.2
) is in series with D1, very large currents can flow
through Q6 before the circuit breaker trips. However, if a
short to ground occurs on the –12V output, diode D1 will
prevent Q5 from turning on, which will prevent Q6 from
turning on.
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