Micrel, Inc.
MIC2310
July 2008
23
M9999-070108-A
Shorted R
SENSE
Detector Trips CB and Asserts
HW_FLT
In order to protect the system from the result of the
installation of a shorted sense resistor on the PCB,
which would increase the effective OC detection
thresholds to unsafe levels, the controller incorporates
a shorted R
SENSE
detection scheme whose operation is
described in Figure 11. The R
SENSE
detection circuitry
is enabled upon the application of an ENABLE LOW-
to-HIGH transition, an elapsed POR timer, and the
V
GS
of the external MOSFET being higher than the
controllers V
GSPGH
threshold voltage. Note that for the
case of a shorted sense resistor, dI
D
/dt control of the
inrush current is disabled and the controller defaults to
dV
GATE
/dt control of the GATE voltage.
An R
SENSE
short is detected by comparing the V
RS
voltage drop across the sense resistor
(V
CCSENSE
-V
SENSE
) to the V
DS
voltage drop across the
external MOSFET (V
SENSE
-V
SOURCE
). To avoid a false
R
SENSE
short detection at low current, a minimum V
DS
of V
DS(FET)
must exist across the external MOSFET
for a shorted sense resistor to be detected. For larger
values of V
DS
across the external MOSFET generated
by higher load currents, the V
RSENSE
threshold
voltage for the detection of an R
SENSE
short follows the
equation V
RSENSE
= 0.5 * (V
DS
- V
DS(FET)
). If there
exists a short across the sense resistor such that V
RS
drops below the V
RSENSE
threshold voltage, then an
internal circuit breaker is tripped, the GATE drive
circuit is disabled, the GATE fault-mode pull-down
current sink is enabled, the DISCH output goes high,
and the HW_FLT digital output is asserted. To repair
the damaged sense resistor and reset the HW_FLT
digital output, the service processor instructs the main
supply to turn off the V
CC
supply voltage to the
controller such that V
REG
falls below the controllers
V
VREG(UVLOL)
threshold voltage.
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
MIC2341-2YTQ
IC HOT PLUG CTLR DUAL PCI 48TQFP
MIC2569YQS TR
IC POWER SWITCH CABLECARD 16QSOP
MIC2583R-MBQS TR
IC CTRLR HOT SWAP 200MV 16-QSOP
MIC2585-2MBTS TR
IC CTRLR HOT SWAP DUAL 24-TSSOP
MIC2586R-2BM TR
IC CTRLR/SEQ HOT SWAP 14-SOIC
MIC2587R-2BM TR
IC CTRLR HOT SWAP POS HV 8-SOIC
MIC2590B-5BTQ TR
IC PCI HOT PLUG CTLR DUAL 48TQFP
MIC2591B-2BTQ TR
IC PCI HOT PLUG CTLR DUAL 48TQFP
相关代理商/技术参数
MIC23150-4YMT EV
功能描述:电源管理IC开发工具 2.0A 4MHz HyperLight Load Buck Regulator - Evaluation Board
RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V
MIC23150-4YMT TR
功能描述:直流/直流开关调节器 2.0A 4MHz HyperLight Load Buck Regulator
RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5
MIC23150-4YMT-TR
功能描述:Buck Switching Regulator IC Positive Fixed 1.2V 1 Output 2A 8-VFDFN Exposed Pad, 8-MLF? 制造商:microchip technology 系列:HyperLight Load? 包装:剪切带（CT） 零件状态:有效 功能:降压 输出配置:正 拓扑:降压 输出类型:固定 输出数:1 电压 - 输入（最小值）:2.7V 电压 - 输入（最大值）:5.5V 电压 - 输出（最小值/固定）:1.2V 电压 - 输出（最大值）:- 电流 - 输出:2A 频率 - 开关:4MHz 同步整流器:是 工作温度:-40°C ~ 125°C （TJ） 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘，8-MLF? 供应商器件封装:8-MLF?（2x2） 标准包装:1
MIC23150-55YMT TR
功能描述:直流/直流开关调节器 2.0A 4MHz HyperLight Load Buck Regulator
RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5
MIC23150-55YMT-TR
功能描述:Buck Switching Regulator IC Positive Fixed 1.35V 1 Output 2A 8-UFDFN 制造商:microchip technology 系列:HyperLight Load? 包装:剪切带（CT） 零件状态:停产 功能:降压 输出配置:正 拓扑:降压 输出类型:固定 输出数:1 电压 - 输入（最小值）:2.7V 电压 - 输入（最大值）:5.5V 电压 - 输出（最小值/固定）:1.35V 电压 - 输出（最大值）:- 电流 - 输出:2A 频率 - 开关:4MHz 同步整流器:是 工作温度:-40°C ~ 125°C （TJ） 安装类型:表面贴装 封装/外壳:8-UFDFN 供应商器件封装:8-TDFN（2x2） 标准包装:1
MIC23150-CYMT EV
功能描述:电源管理IC开发工具 2.0A 4MHz HyperLight Load Buck Regulator - Evaluation Board
RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V
MIC23150-CYMT TR
功能描述:直流/直流开关调节器 1.5A 4MHz HyperLight Load Buck Regulator
RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5
MIC23150-CYMT-TR
功能描述:Buck Switching Regulator IC Positive Fixed 1V 1 Output 2A 8-VFDFN Exposed Pad, 8-MLF? 制造商:microchip technology 系列:HyperLight Load? 包装:剪切带（CT） 零件状态:停产 功能:降压 输出配置:正 拓扑:降压 输出类型:固定 输出数:1 电压 - 输入（最小值）:2.7V 电压 - 输入（最大值）:5.5V 电压 - 输出（最小值/固定）:1V 电压 - 输出（最大值）:- 电流 - 输出:2A 频率 - 开关:4MHz 同步整流器:是 工作温度:-40°C ~ 125°C （TJ） 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘，8-MLF? 供应商器件封装:8-MLF?（2x2） 标准包装:1