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參數(shù)資料
| 型號(hào)： | MAX5948B |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 4-2-3-2 Input AND-OR-invert Gates 14-CDIP -55 to 125 |
| 中文描述： | -48V熱插拔控制器，外置RSENSE |
| 文件頁(yè)數(shù)： | 11/18頁(yè) |
| 文件大?。?/td> | 685K |
| 代理商： | MAX5948B |
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M
-48V Hot-Swap Controllers
with External R
SENSE
______________________________________________________________________________________
11
step to 5A. The circuit-breaker trip current is
50mV/20m
= 2.5A. Solving for R7 x C3 in the equation
above yields a desired time constant of 100μs. This can
be achieved with R7 = 100
and C3 = 1μF.
In the event of a short circuit at the output, the input
supply may dip below the UV threshold, resetting the
circuit breaker. The MAX5948 cycles ON and OFF until
the short is removed, which can be minimized by creat-
ing a deglitching delay at the UV pin with a capacitor
from UV to V
EE
. This allows the input supply to recover
before the UV pin resets the circuit breaker.
Figure 10 shows a circuit that automatically resets the
circuit breaker after a current fault. Transistors Q2 and
Q3 along with C4, D1, R7, and R8 form a programma-
ble one-shot circuit. In normal operation, the GATE pin
is pulled high and Q3 is turned on, pulling node 2 to
V
EE
. Resistor R8 turns off Q2. When a short occurs, the
GATE pin is pulled low and Q3 turns off. Node 2 starts
to charge C4 and Q2 turns on, pulling the UV pin low
and resetting the circuit breaker. The instant C4 is fully
charged, R8 turns off Q2, UV goes high and the GATE
starts to ramp up. Q3 turns back on and pulls node 2
back to V
EE
. Diode D1 clamps node 3 at one diode
drop below V
EE
. The duty cycle is set to 10% to prevent
Q1 from overheating.
Undervoltage and Overvoltage Protection
The UV and OV pins can be used to detect undervolt-
age and overvoltage conditions. The UV and OV pins
are internally connected to analog comparators with
20mV of hysteresis. When the UV voltage falls below its
threshold or the OV voltage rises above its threshold,
the GATE pin is immediately pulled low. The GATE pin
is held low until UV goes high and OV is low indicating
that the input supply voltage is within specification.
V
EE
SENSE
GATE
DRAIN
V
DD
OV
UV
PWRGD
MAX5948A
-48V RTN
-48V RTN
(SHORT PIN)
*
-48V
*DIODES INC. SMAT70A.
R4
562k
1%
R8
510k
5%
R5
19.1k
1%
R6
562k
1%
R7
1M
5%
R9
10k
1%
R1
0.02
5%
R3
18k
5%
R2
10
5%
C1
150nF
25V
C4
1
μ
F
100V
Q1
IRF530
D1
1N4148
Q2
2N2222
Q3
ZVN3310
C2
3.3nF
100V
C3
100
μ
F
100V
GATE
2V/div
NODE2
50V/div
1s/div
NODE 2
Figure 10. Automatic Restart After Current Fault
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX5948BESA | -48V Hot-Swap Controllers with External RSENSE |
| MAX5949 | -48V Hot-Swap Controllers with External RSENSE |
| MAX5949AESA | -48V Hot-Swap Controllers with External RSENSE |
| MAX5949BESA | Dual D-type Positive-Edge-Triggered Flip-Flops With Preset And C 14-CDIP -55 to 125 |
| MAX6029 | Ultra-Low-Power Precision Series Voltage Reference |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5948BESA | 功能描述:熱插拔功率分布 RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5948BESA+ | 功能描述:熱插拔功率分布 48V- Hot-Swap Controller RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5948BESA+T | 功能描述:熱插拔功率分布 48V- Hot-Swap Controller RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5948BESA-T | 功能描述:熱插拔功率分布 RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5949AESA | 功能描述:熱插拔功率分布 RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
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