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參數(shù)資料
| 型號： | SMH4802 |
| 廠商： | Summit Microelectronics, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Programmable -48V Hot-Swap Controller with Forced Shut Down |
| 中文描述： | 可編程的- 48V熱插拔控制器強(qiáng)制關(guān)機(jī) |
| 文件頁數(shù)： | 11/20頁 |
| 文件大小： | 573K |
| 代理商： | SMH4802 |
11
2062 2.3 6/19/03
SMH4802
SUMMIT MICROELECTRONICS, Inc.
Preliminary Information
APPLICATIONS INFORMATION (
Continued
)
Notes:
1. The 10
resistor (R7) must be located as close as possible to the MOSFET.
2. Optional interface circuit (Q2). The PG# output can be directly connected to the power module if the input voltage to the module is within
tolerance and the voltage on the PG# output doesn’t exceed 15V.
3. If the DRAIN SENSE signal is not used tie the pin directly to V
SS
(pin 7).
Figure 9. Example Applications Schematic.
Pin numbers reflect SOIC package.
The trip voltage of the UV and OV inputs is 2.5V relative
to V
SS.
Large value resistors can be used in the resistive
divider as the input impedance of UV and OV is very high.
The divider resistors should be high stability 1% metal-
film resistors to keep the under-voltage and over-voltage
trip points accurate.
Telecom Design Example
A hot-swap telecom application may use a 48V power
supply with a –25% to +50% tolerance (i.e. the 48V
supply can vary from 36V to 72V). The formulas for
calculating R1, R2, and R3 are as follows.
First, a peak current, ID
MAX
, must be specified for the
resistive network. The value of the current is arbitrary,
but it cannot be too high (self-heating in R3 becomes a
problem) or too low (the value of R3 becomes very large,
and leakage currents can reduce the accuracy of the OV
and UV trip points). The value of IDMAX should be
≥
200μA
for the best accuracy at the OV and UV trip points. A value
–48V Ret
–48V
V
5
SMH4802
EN/TS
V
C
V
D
S
RD
2062 Fig09
F
UV
OV
8
9
10
3
7
6
2
1
14
11
S
S
5
4
2
4
6
8
10
1
3
5
7
9
J1
R11
100k
C2
0.1
μ
F
R8
10k
R7
10
R6
0.02
D1
C3
47nF
C1
1
μ
F
–48V Switched
Optional
DRAIN
SENSE
Components
C5
0.01
μ
F
PG#
12
R10
100k
Q2
L14N1/TO
R9
100
ISO2
R3
270k
R1
10k
R4
10k
R2
10k
–48V Ret
ENABLE#
EN/TS
5VREF
FS
Optional
Forced
Shutdown
Components
SMX3200
Connector
Header
R5 47k
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