參數(shù)資料
型號: LT1640AL
廠商: Linear Technology Corporation
元件分類: 基準(zhǔn)電壓源/電流源
英文描述: Negative 48V Hot Swap Controller
中文描述: 負(fù)48V熱插拔控制器
文件頁數(shù): 11/12頁
文件大小: 292K
代理商: LT1640AL
11
LT1640L/LT1640H
APPLICATIO
S I
FOR
ATIO
U
W
U
U
pull-up current in the module then flows through R7,
pulling the PWRGD pin high and enabling the module.
When the DRAIN voltage of the LT1640L is high with
respect to V
EE
, the internal pull-down transistor Q2 is off
and the PWRGD pin is in a high impedance state (Figure
12). The PWRGD pin will be pulled high by the module’s
internal pull-up current source, turning the module off.
When the DRAIN voltage drops below V
PG
, Q2 will turn on
and the PWRGD pin will pull low, enabling the module.
The PWRGD signal can also be used to turn on an LED or
optoisolator to indicate that the power is good as shown in
Figure 13.
Gate Pin Voltage Regulation
When the supply voltage to the chip is more than 15.5V,
the GATE pin voltage is regulated at 13.5V above V
EE
. If the
supply voltage is less than 15.5V, the GATE voltage will be
about 2V below the supply voltage. At the minimum 10V
supply voltage, the gate voltage is guaranteed to be greater
than 6V. The gate voltage will be no greater than 18V for
supply voltages up to 80V.
+
V
EE
V
DD
LT1640H
SENSE
C1
C3
Q1
R2
R3
C2
R4
R5
R6
R1
4
3
2
OV
GND
–48V
UV
5
6
8
1
7
GATE
1640 F11
PWRGD
DRAIN
V
EE
R7
5k
Q2
+
+
V
PG
Q3
ACTIVE LOW
ENABLE MODULE
V
IN+
V
OUT+
V
OUT–
V
IN–
ON/OFF
Figure 11. Active High Enable Module
+
V
EE
V
DD
LT1640L
SENSE
C1
C3
Q1
R2
R3
C2
R4
R5
R6
R1
4
3
2
OV
GND
–48V
UV
5
6
8
1
7
GATE
ACTIVE LOW
ENABLE MODULE
V
IN+
V
OUT+
V
OUT–
1640 F12
V
IN–
PWRGD
DRAIN
V
PG
V
EE
Q2
ON/OFF
+
+
Figure 12. Active Low Enable Module
Figure 13. Using PWRGD to Drive an Optoisolator
V
EE
V
DD
LT1640L
PWRGD
SENSE
C1
0.033
μ
F
24V
C3
100
μ
F
100V
Q1
IRF530
R2
10
5%
R7
51k
5%
R3
10k
5%
C2
3.3nF
100V
R4
562k
1%
R5
9.09k
1%
R6
10k
1%
R1
0.02
5%
4
3
2
OV
GND
–48V
UV
5
6
8
7
1
4N25
GATE
DRAIN
1640 F13
PWRGD
+
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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