参数资料
| 型号： | MC34713EPR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 14/23页 |
| 文件大小： | 0K |
| 描述： | IC CONVERTER DDR 24QFN |
| 标准包装： | 2,500 |
| 应用： | 转换器，DDR |
| 输入电压： | 3 V ~ 6 V |
| 输出数： | 1 |
| 输出电压： | 0.7 V ~ 3.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-VFQFN 裸露焊盘 |
| 供应商设备封装： | 24-QFN 裸露焊盘（4x4） |
| 包装： | 带卷 (TR) |
FUNCTIONAL DEVICE OPERATION
PROTECTION AND DIAGNOSTIC FEATURES
output signal low after a 10 ms reset delay, to indicate to the
host that the device is in normal operation.
PROTECTION AND DIAGNOSTIC FEATURES
The 34713 monitors the application for several fault
conditions to protect the load from overstress. The reaction of
the IC to these faults ranges from turning off the outputs to
just alerting the host that something is wrong. In the following
paragraphs, each fault condition is explained:
Output Over-voltage
An over-voltage condition occurs once the output voltage
goes higher than the rising over-voltage threshold (V OVR ). In
this case, the power good output signal is pulled high, alerting
the host that a fault is present, but the output will stay active.
To avoid erroneous over-voltage conditions, a 20 μs filter is
implemented. The buck converter will use its feedback loop
to attempt to correct the fault. Once the output voltage falls
below the falling over-voltage threshold (V OVF ), the fault is
cleared and the power good output signal is pulled low, the
device is back in normal operation.
Output Under-voltage
An under-voltage condition occurs once the output voltage
falls below the falling under-voltage threshold (V UVF ). In this
case, the power good output signal is pulled high, alerting the
host that a fault is present, but the output will stay active. To
avoid erroneous under-voltage conditions, a 20 μs filter is
implemented. The buck converter will use its feedback loop
to attempt to correct the fault. Once the output voltage rises
above the rising under-voltage threshold (V UVR ), the fault is
cleared and the power good output signal is pulled low, the
device is back in normal operation.
Output Over-current
This block detects over-current in the Power MOSFETs of
the buck converter. It is comprised of a sense MOSFET and
a comparator. The sense MOSFET acts as a current
detecting device by sampling a ratio of the load current. That
sample is compared via the comparator with an internal
reference to determine if the output is in over-current or not.
If the peak current in the output inductor reaches the over
current limit (I LIM ), the converter will start a cycle-by-cycle
operation to limit the current, and a 10 ms over-current limit
timer (t LIM ) starts. The converter will stay in this mode of
operation until one of the following occurs:
? The current is reduced back to the normal level before
t LIM expires, and in this case normal operation is
regained.
? t LIM expires without regaining normal operation, at
which point the device turns off the output and the
power good output signal is pulled high. At the end of a
time-out period of 100 ms (t TIMEOUT ), the device will
attempt another soft start cycle.
? The device reaches the thermal shutdown limit (T SDFET )
and turns off the output. The power good output signal
is pulled high.
? The output current keeps increasing until it reaches the
short circuit current limit (I SHORT ). See below for more
details.
Short-circuit Current Limit
This block uses the same current detection mechanism as
the over-current limit detection block. If the load current
reaches the I SHORT value, the device reacts by shutting down
the output immediately. This is necessary to prevent damage
in case of a permanent short-circuit. Then, at the end of a
timeout period of 100 ms (t TIMEOUT ), the device will attempt
another soft start cycle.
Thermal Shutdown
Thermal limit detection block monitors the temperature of
the device and protects against excessive heating. If the
temperature reaches the thermal shutdown threshold
(T SDFET ), the converter output switches off and the power
good output signal indicates a fault by pulling high. The
device will stay in this state until the temperature has
decreased by the hysteresis value and then After a timeout
period (T TIMEOUT ) of 100 ms, the device will retry
automatically and the output will go through a soft start cycle.
If successful normal operation is regained, the power good
output signal is asserted low to indicate that.
34713
Analog Integrated Circuit Device Data
14
Freescale Semiconductor
相关PDF资料 |
PDF描述 |
|---|---|
| MC34716EPR2 | IC CONVERTER DDR 26QFN |
| MC34717EPR2 | IC CONVERTER DDR 26QFN |
| MC34827A1EPR2 | IC USB POWER MANAGER 20-QFN |
| MC34921AER2 | IC MOTOR DRVR PWM DC DUAL 64LQFP |
| MC34923EGR2 | IC PWM MOTOR DRIVER FULL 24-SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MC34715 | 制造商:SPC Multicomp 功能描述:HEADER VERTICAL 2WAY 制造商:SPC Multicomp 功能描述:HEADER, VERTICAL, 2WAY 制造商:SPC Multicomp 功能描述:WIRE-BOARD CONN, RECEPTACLE, 2POS, 3MM; Series:2261(5561); Pitch Spacing:3mm; Contact Termination:Through Hole Vertical; No. of Contacts:2; No. of Rows:2; Connector Mounting:PCB; Gender:Receptacle; Contact Material:Copper Alloy ;RoHS Compliant: Yes |
| MC34716EP | 功能描述:开关变换器、稳压器与控制器 DUAL SWITCH REG RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| MC34716EPR2 | 功能描述:开关变换器、稳压器与控制器 DUAL SWITCH REG RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| MC34717 | 制造商:SPC Multicomp 功能描述:HEADER R/ANGLE 4WAY 制造商:SPC Multicomp 功能描述:HEADER, R/ANGLE, 4WAY 制造商:SPC Multicomp 功能描述:WIRE-BOARD CONN, RECEPTACLE, 4POS, 3MM; Series:2261(5561); Pitch Spacing:3mm; Contact Termination:Through Hole Right Angle; No. of Contacts:4; No. of Rows:2; Connector Mounting:PCB; Gender:Receptacle; Contact Material:Copper Alloy ;RoHS Compliant: Yes |
| MC34717EP | 功能描述:开关变换器、稳压器与控制器 5.0A 1.0MHZ DUAL SWITCH RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
发布紧急采购，3分钟左右您将得到回复。