This is one of the pulse-width modulation IC types. A PC power supply PWM supervisor IC is a specialized integrated circuit designed to monitor and control the operation of a power supply unit (PSU) used in personal computers. These ICs are responsible for supervising various aspects of the power supply operation, including voltage regulation, protection, and control of the pulse width modulation (PWM) signal used to drive the power supply.

Part Number: EST7502B

Function: PC Power Supply PWM with Supervisor

Pinouts: DIP 16 Pin type

Manufacturer: EST

See the preview image and the PDF file for more information.

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Description

The EST7502B is a pulse–width modulation (PWM) control circuit with complete protection circuits for used in the SMPS (Switched Mode Power Supply). It contains various functions, which are Over Voltage Protection, Under Voltage Protection, Power Good Output (PGO), Remote On/Off control and etc. It can minimize external components of switching power supply systems in personal computer.

Over Voltage Protection (OVP) monitors 3.3V, 5V, 12V and PT input voltage level. Under Voltage Protection (UVP) monitors 3.3V, 5V and 12V input voltage level. Power Good Output monitors the voltage level of power supply.

1. Voltage Monitoring: These ICs monitor the output voltages of the power supply, such as +12V, +5V, +3.3V, and others. They compare the monitored voltages with predefined thresholds and provide feedback to the control circuitry for voltage regulation.

2. Overvoltage and Undervoltage Protection: The PWM supervisor IC incorporates protection circuitry to detect overvoltage and undervoltage conditions. When these conditions occur, the IC triggers appropriate actions, such as shutting down the power supply or activating protective measures to prevent damage to the system.

3. Overcurrent Protection: These ICs monitor the current flowing through the power supply’s output circuits. If the current exceeds a predefined limit, the PWM supervisor IC can initiate protective measures, such as reducing the duty cycle of the PWM signal or shutting down the power supply.

EST7502B Pinout

 

Features:

1. Complete PWM Control and Protection Circuitry
2. Over Voltage Protection for 3.3V / 5V / 12V / PT
3. Under Voltage Protection for 3.3V / 5V / 12V
4. 280ms PG Time Delay
5. Power Good Output is Open Drain Output
6. PWM Control Output are Open Drain Output
7. 280 ms Time Delay for UVP
8. Remote ON/OFF function De–

 

EST7502B Datasheet

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• General Purpose Photocoupler

Part Number: TLC7701-EP

Function: MICROPOWER SUPPLY VOLTAGE SUPERVISORS

Package: TSSOP, SOIC 8 Pin Type

Manufacturer: Texas Instruments

Pinouts:

 

Description

The TLC7701-EP family of micropower supply voltage supervisors provide reset control, primarily in microcomputer and microprocessor systems. During power-on, RESET is asserted when VDD reaches 1 V. After minimum VDD(≥ 2 V) is established, the circuit monitors SENSE voltage and keeps the reset outputs active as long as SENSE voltage (VI(SENSE)) remains below the threshold voltage. An internal timer delays return of the output to the inactive state to ensure proper system reset. The delay time (td) is determined by an external capacitor:

Features

• Power-On Reset Generator
• Automatic Reset Generation After Voltage Drop
• Precision Voltage Sensor
• Temperature-Compensated Voltage Reference
• Programmable Delay Time by External Capacitor
• Supply Voltage Range . . . 2 V to 6 V
• Defined RESET Output from VDD≥ 1 V
• Power-Down Control Support for Static RAM With Battery Backup
• Maximum Supply Current of 16 mA
• Power Saving Totem-Pole Outputs
• Controlled Baseline
• One Assembly/Test Site
• One Fabrication Site
• Available in Extended (–40°C/125°C and –55°C/125°C), Temperature Ranges
• Extended Product Life Cycle
• Extended Product-Change Notification
• Product Traceability

 

Other data sheets are available within the file:

7701ME, 7701QE, 7705QE, 7733ME, 7733QE, TLC7701QPWREP

 

TLC7701-EP Datasheet PDF Download