ZCD-28PT835A is a PWM-controlled random-phase firing module designed for triac and reverse-parallel SCR drive applications. It operates over an 85 V – 285 V AC RMS input range and controls firing according to the duty cycle of the applied PWM signal. The module provides zero-crossing and firing signal monitoring outputs, isolated digital inputs and outputs, and an isolated 800 V triac / dual SCR driver output stage for digitally controlled AC power applications.
ZCD-28PT835A – PWM-Controlled Random Phase Dimmer and Triac/SCR Driver
Advanced control features:
- Selectable logic level: 1.7 V – 5.5 V
- Control inputs and monitoring outputs:
- Firing enable/disable logic control
- Firing control based on PWM duty cycle
- Frequency: 400 Hz – 10 kHz
- Duty cycle: 0% – 100%
- Zero-crossing point logic monitoring output
- Firing signal logic monitoring output
- Inputs with ESD, EFT, and surge immunity
Insulation barrier features:
- Isolation up to 5000 V RMS @ 1 min
- Surge protection up to 10 kV
- ±150 kV/µs typical CMTI
- Safety-related certifications: DIN EN IEC 60747-17
(VDE 0884-17), UL 1577, IEC 62368-1, IEC 61010-1,
IEC 60601-1, GB 4943.1
AC input features:
- AC input voltage: 85 V – 285 V AC RMS
- Frequency range: 45 Hz – 65 Hz
- Low power consumption: 1.6 W @ 220 V AC
- High interruption and noise immunity: > 1 ms
- Triac / dual SCR driver output features:
- Off-state output terminal voltage: 800 V
- Peak non-repetitive surge current: 3 A @ 60 Hz
- Peak on-state current: 300 mA
- Safety and regulatory approvals: UL 1577, 5000 V
AC RMS / 1 min, DIN EN/IEC 60747-5-5
