+48V Quad Hot-Swap Controllers For
Power-Over-LAN
12 ______________________________________________________________________________________
The first comparator compares the sensed voltage
against the V
SC
threshold (typically 142.5mV). Choose
a sense resistor as follows:
R
SENSE
= V
SC
/ I
MAX
where I
MAX
is the maximum current allowed through
the switch.
When I
MAX
is reached, foldback current-limit circuitry
regulates the current limit as a function of V
OUT
(Figure
8). As V
OUT
approaches zero, the maximum voltage drop
across the sense resistor is lowered to a minimum value
of 48mV (typ). This foldback feature helps reduce the
power dissipation in the external power FET during output
overload and output short-circuit conditions. If a load with
very low activation voltage is permanently connected to
the output, make the minimum limit current sufficiently
larger than the load current. If the load current indeed
exceeds the foldback-limit value, the MAX5913A/
MAX5914A are not able to power up the switch.
Test Circuits and Timing Diagrams
V
UVLO
V
CC
V
GATE
t
D, UVLO
+1V
V
IH
V
IL
+1V
RLYON
RLYD
(MAX5913A)
t
ON_DEL
t
OFF_DEL
V
RLY
V
GATE
+42V
3.3V
DGND
RLYON1
ON1
ON2
RLYON2
CSP2
CSP1
DRAIN2
OUT2
270礔
270礔
270礔
470礔
270礔
0.33&
200&
100&
100&
0.33&
GATE2
DRAIN1
OUT1
GATE1
V
OUT
V
CC
V
TEST
MAX5913A/MAX5914A
(V
CC
- V
OUT
) d 1.5V
(POWER-OK IS GOOD)
V
CC
t
OC
V
GATE
t
LPFD
+1V
OC DETECTOR ENABLED
(INTERNAL SIGNAL)
Figure 1. UVLO Deglitch Delay
Figure 3. Port Turn-On Delay, Relay Turn-Off Delay
Figure 4. Channel-to-Channel Crosstalk Test Circuit
Figure 2. Open-Circuit Detector Deglitch Delay
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
MAX5916EUI+
IC HOT-SWAP CTRLR DUAL 28-TSSOP
MAX5917BESE+
IC HOT-SWAP SWITCH 65V 16-SOIC
MAX5920BESA+
IC HOT-SWAP CTRLR -48V 8-SOIC
MAX5922AEUI+
IC NETWORK PWR SW +48V 28-TSSOP
MAX5923EUP+T
IC HOT-SWAP SWITCH +60V 20-TSSOP
MAX5926EEE+
IC HOT-SWAP CONTROLLER 16QSOP-EP
MAX5929BEEG+
IC HOT SWAP CTLR QUAD 24QSOP
MAX5930AEEG+
IC HOT SWAP CTLR PWR SEQ 24QSOP
相关代理商/技术参数
MAX5913AEMH+D
制造商:Maxim Integrated Products 功能描述:HOT SWAP CNTRLR 44MQFP - Rail/Tube
MAX5913AEMH+T
功能描述:热插拔功率分布 48V Hot-Swap Controller RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube
MAX5913AEMH+TD
制造商:Maxim Integrated Products 功能描述:HOT SWAP CNTRLR 44MQFP - Tape and Reel
MAX5913AEMH-T
功能描述:热插拔功率分布 RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube
MAX5913EMH
制造商:Maxim Integrated Products 功能描述:+48V QUAD HOT-SWAP CONTROLLERS FOR POWER-OVER - Rail/Tube
MAX5913EMH+
制造商:Maxim Integrated Products 功能描述:HOT SWAP CNTRLR 44MQFP - Rail/Tube
MAX5913EMH+T
制造商:Maxim Integrated Products 功能描述:HOT SWAP CNTRLR 44MQFP - Tape and Reel
MAX5913EMH-T
制造商:Maxim Integrated Products 功能描述:+48V QUAD HOT-SWAP CONTROLLERS FOR POWER-OVER - Tape and Reel