The monolithic integrated circuits contain all the functions necessary to monitor and control the output of a sophisticated power supply system. Over-voltage (O.V.) sensing with provision to trigger an external SCR "crowbar" shutdown; an undervoltage (U.V.) circuit which can be used to monitor either the output or to sample the input line voltage; and a third op amp/comparator usable for current sensing (C.L.) are all included in this device, together with an independent, accurate reference generator.

Both over- and under-voltage sensing circuits can be externally programmed for minimum time duration of fault before triggering. All functions contain open collector outputs which can be used independently or wire-or’ed together, and although the SCR trigger is directly connected only to the over-voltage sensing circuit, it may be optionally activated by any of the other outputs, or from an external signal. The O.V. circuit also includes an optional latch and external reset capability.

The UC1544/2544/3544 devices have the added versatility of completely uncommitted inputs to the voltage sensing comparators so that levels less than 2.5 V may be monitored by dividing down the internal reference voltage. The current sense circuit may be used with external compensation as a linear amplifier or as a highgain comparator. Although nominally set for zero input offset, a fixed threshold may be added with an external resistor. Instead of current limiting, this circuit may also be used as an additional voltage monitor.

The reference generator circuit is internally trimmed to eliminate the need for external potentiometers and the entire circuit may be powered directly from either the output being monitored or from a separate bias voltage.

• Includes Over-Voltage, Under-Voltage, and Current Sensing Circuits
• Internal 1% Accurate Reference
• Programmable Time Delays
• SCR "Crowbar" Drive of 300 mA
• Remote Activation Capability
• Optional Over-Voltage Latch
• Uncommitted Comparator Inputs for Low Voltage Sensing (UC1544 Series Only)

• Number of supplies monitored
• 1
• Threshold voltage 1 (Typ) (V)
• 2.5
• Features
• Overcurrent sense, Undervoltage and overvoltage monitor, Wide input voltage
• Reset threshold accuracy (%)
• 2
• Output driver type/reset output
• Active-low, Open-drain
• Time delay (ms)
• Programmable
• Rating
• Military
• Watchdog timer WDI (sec)
• None
• Operating temperature range (C)
• -55 to 125

UC1543的完整型号有：5962-8774001EA、5962-8774001FA、UC1543J、UC1543J883B、UC1543L、UC1543L883B、UC1543W883B，以下是这些产品的关键参数及官网采购报价：

5962-8774001EA，工作温度：-55 to 125，封装：CDIP (J)-16，包装数量MPQ：1个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：SNPB，TI官网5962-8774001EA的批量USD价格：51.617（1000+）

5962-8774001FA，工作温度：PropertyValue，封装：CFP (W)-16，包装数量MPQ：25个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：SNPB，TI官网5962-8774001FA的批量USD价格：106.92（1000+）

UC1543J，工作温度：-55 to 125，封装：CDIP (J)-16，包装数量MPQ：1个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：SNPB，TI官网UC1543J的批量USD价格：36.869（1000+）

UC1543J883B，工作温度：-55 to 125，封装：CDIP (J)-16，包装数量MPQ：1个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：SNPB，TI官网UC1543J883B的批量USD价格：51.617（1000+）

UC1543L，工作温度：-55 to 125，封装：LCCC (FK)-20，包装数量MPQ：1个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：SNPB，TI官网UC1543L的批量USD价格：55.304（1000+）

UC1543L883B，工作温度：-55 to 125，封装：LCCC (FK)-20，包装数量MPQ：1个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：SNPB，TI官网UC1543L883B的批量USD价格：70.051（1000+）

UC1543W883B，工作温度：PropertyValue，封装：CFP (W)-16，包装数量MPQ：25个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：SNPB，TI官网UC1543W883B的批量USD价格：106.92（1000+）

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