Description

Si9182DH-28-T1 is a current mode PWM controller designed for ISDN power supplies. It comes in a 14-pin SOIC package and provides all the necessary functions to implement a single-switch PWM with minimal external parts. The Si9182DH-28-T1 features a 200-V depletion mode MOSFET, allowing it to directly power off the high input bus without the need for an external start-up circuit. The Start and Stop input voltage thresholds can be adjusted within the operating input voltage range through a resistor divider.

Specifications and Features

• Product Category: IC Chips
• Technology: BiC/DMOS
• Control: Current Mode
• Max Duty Cycle: 50%
• Error Amp Frequency: 1.3 MHz
• Internal Oscillator Frequency: Up to 500 kHz
• Soft-Start
• Fast Over-Current Protection: 0.6 V
• Supply Current: <5 µA for +VIN <18 V
• Input Voltage Range: 23.5 V to 200 V
• Programmable Start/Stop Capability
• Internal Start-Up Circuit
• Power_Good Output

Application Scenarios

The Si9182DH-28-T1 is commonly used in ISDN power supplies. With its current mode control, it provides an efficient and reliable solution for power management in ISDN systems. Its small form factor and integrated features make it suitable for compact designs with minimal external components.

Comparison

• Integrated depletion mode MOSFET for direct power supply
• Wide input voltage range for flexible application
• Programmable start/stop capability
• Compact design due to minimal external parts

• Not suitable for applications requiring duty cycles above 50%