参数资料
型号: PTB48560AAZ
厂商: TEXAS INSTRUMENTS INC
元件分类: 电源模块
英文描述: 1-OUTPUT 30 W DC-DC REG PWR SUPPLY MODULE
封装: ROHS COMPLIANT PACKAGE-11
文件页数: 4/29页
文件大小: 800K
代理商: PTB48560AAZ
www.ti.com
Input Overvoltage Protection
Differential Output Voltage Sense
Overtemperature Protection
Output Voltage Adjustment
PTB48560A, PTB48560B
PTB48560C
SLTS236A–MARCH 2005–REVISED OCTOBER 2005
APPLICATION INFORMATION (continued)
output that exceeds the converter overcurrent threshold (see applicable specification) causes the output voltage
to momentarily fold back, and then shut down. Following shutdown, the module periodically attempts to
automatically recover by initiating a soft-start power up. This is often described as a hiccup mode of operation,
whereby the module continues in the cycle of successive shutdown and power up until the load fault is removed.
Once the fault is removed, the converter automatically recovers and returns to normal operation.
The converter protects itself against input voltage surges and transients of up to 100 V. This is above the
maximum continuous operating input voltage of 75 V. In order to protect itself, the converter output is disabled at
some voltage above 75 V. This is to ensure that the converter internal components are not exposed to voltages
above their stress ratings. The converter output remains off for some of the period that the input voltage is above
the maximum continuous rating. Once the overvoltage event has passed, the output from the converter
automatically restarts by executing a soft-start power up.
A differential remote sense allows a converter regulation circuitry to compensate for limited amounts of IR drop,
that may be incurred between the converter and load, in either the positive or return PCB traces. Connecting the
+Sense and –Sense pins to the respective positive and ground reference of the load terminals improves the load
regulation of the converter output voltage at that connection point. The –Sense pin should always be connected
to the VO COM.The +Sense pin may be connected to either the +VO Bus or +VO Seq outputs.
When the +Sense pin is connected to the VO Seq output, the voltage at VO Bus voltage regulates slightly higher.
Depending on the load conditions on the VO Seq output, the voltage at VO Bus may be up to 100 mV higher than
the converter set-point voltage. In addition, the Smart-Sense feature (incorporated into the converter) only
engages sense compensation to the VO Seq output when that output voltage is close to the set-point. During a
power-up sequencing event, the sense circuit automatically defaults to sensing the VO Bus voltage, internal to
the converter.
Leaving the +Sense and –Sense pins open does not damage the converter or load circuit. The converter
includes default circuitry that keeps the output voltage in regulation. However, if the remote sense feature is not
used, the –Sense pin should still be connected to VOCOM.
Note: The remote sense feature is not designed to compensate for the forward drop of nonlinear or
frequency-dependent components that may be placed in series with the converter output. Examples include
OR-ing diodes, filter inductors, ferrite beads, and fuses. When these components are enclosed by the sense pin
connections, they are effectively placed inside the regulation control loop, which can adversely affect the stability
of the converter.
Overtemperature protection is provided by an internal temperature sensor, which monitors the temperature of the
converter PCB (close to pin 1). If the PCB temperature exceeds a nominal 115°C, the converter shuts down. The
converter then automatically restarts when the sensed temperature falls to approximately 105°C. When operated
outside its recommended thermal derating envelope (see data sheet derating curves), the converter typcially
cycles on and off at intervals from a few seconds to one or two minutes. This is to ensure that the internal
components are not permanently damaged from excessive thermal stress.
An external resistor is required to set the nominal output voltage(s) of the converter to a voltage higher than its
minimum value. The resistor, RSET, must be connected directly between the VO Adjust (pin 8) and –Sense (pin 7)
terminals. A 0.05-W rated resistor can be used. The tolerance should be 1%, with a temperature stability of 100
ppm/°C (or better). Place the resistor close to the converter and connect it using dedicated PCB traces (see
Figure 14). Table 1 gives the nearest standard value of external resistor for the common voltages within each
model's adjust range. The actual output voltage that the resistor value provides is also provided.
12
相关PDF资料
PDF描述
PTB48580AAS 2-OUTPUT 30 W DC-DC REG PWR SUPPLY MODULE
PTB48580BAH 2-OUTPUT 30 W DC-DC REG PWR SUPPLY MODULE
PTB48580BAZ 2-OUTPUT 30 W DC-DC REG PWR SUPPLY MODULE
PTB48580AAZ 2-OUTPUT 30 W DC-DC REG PWR SUPPLY MODULE
PTB48580AAH 2-OUTPUT 30 W DC-DC REG PWR SUPPLY MODULE
相关代理商/技术参数
参数描述
PTB48560B 制造商:TI 制造商全称:Texas Instruments 功能描述:30-W, 48-V INPUT DC/DC CONVERTERS WITH AUTO-TRACK TM SEQUENCING
PTB48560BAH 功能描述:DC/DC转换器 30-W 1.8V to 3.6V Adj DC/DC Converter RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压(标称): 输出端数量:1 输出电压(通道 1):3.3 V 输出电流(通道 1):600 mA 输出电压(通道 2): 输出电流(通道 2): 安装风格:SMD/SMT 封装 / 箱体尺寸:
PTB48560BAS 功能描述:DC/DC转换器 30-W 1.8V to 3.6V Adj DC/DC Converter RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压(标称): 输出端数量:1 输出电压(通道 1):3.3 V 输出电流(通道 1):600 mA 输出电压(通道 2): 输出电流(通道 2): 安装风格:SMD/SMT 封装 / 箱体尺寸:
PTB48560BAZ 功能描述:DC/DC转换器 30-W 1.8V to 3.6V Adj DC/DC Converter RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压(标称): 输出端数量:1 输出电压(通道 1):3.3 V 输出电流(通道 1):600 mA 输出电压(通道 2): 输出电流(通道 2): 安装风格:SMD/SMT 封装 / 箱体尺寸:
PTB48560C 制造商:TI 制造商全称:Texas Instruments 功能描述:30-W, 48-V INPUT DC/DC CONVERTERS WITH AUTO-TRACK TM SEQUENCING