Microchip Technology SG3525AN
| Parameters | |
|---|---|
| Series | - |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| RoHS Status | RoHS non-compliant |
| Package / Case | 16-DIP (0.300", 7.62mm) |
| Mfr | Microchip Technology |
| Mounting Type | Through Hole |
| Operating Temperature | 0°C ~ 70°C (TA) |
| Output Type | Transistor Driver |
| Number of Outputs | 2 |
| Supplier Device Package | 16-PDIP |
| Output Configuration | Positive |
| Function | Step-Up/Step-Down |
| Topology | Push-Pull |
| Voltage - Supply (Vcc/Vdd) | 8V ~ 35V |
| Control Features | Enable, Frequency Control, Soft Start |
| Frequency - Switching | 100Hz ~ 400kHz |
| Synchronous Rectifier | Yes |
| Serial Interfaces | - |
| Output Phases | 1 |
| Duty Cycle (Max) | 49% |
| Clock Sync | Yes |
| Package | Tube |
| Product Status | Obsolete |
| Base Product Number | SG3525 |
| REACH Status | REACH Unaffected |
| Standard Package | 25 |
| ECCN | EAR99 |
| HTSUS | 8542.31.0001 |
SG3525AN Pulse Width Modulation (PWM) Controller
The SG3525AN is a high-performance voltage-mode PWM controller designed for switching power supplies, including AC-DC and DC-DC converters, inverters, and welding machines. Manufactured by STMicroelectronics, this 16-pin DIP device operates across an 8V to 35V input voltage range and supports oscillator frequencies from 100Hz to 500kHz. Its core features include a precision ±1% internal 5.1V reference voltage, eliminating the need for external resistors, and a totem-pole output stage capable of sourcing/sinking over 200mA with "NOR" logic (low output in OFF state).
The chip integrates advanced protection mechanisms such as input undervoltage lockout with 500mV hysteresis, latching PWM to prevent multiple pulses, and pulse-by-pulse shutdown for instantaneous fault response. A single resistor between the CT and Discharge pins enables adjustable dead-time control, while the built-in soft-start circuit requires only an external timing capacitor. Applications span industrial power supplies, battery chargers, and motor drives, where reliability and efficiency are critical.
Alternative Voltage-mode power supply IC Models
● UC3525AN (Texas Instruments): A pin-compatible replacement with identical voltage range (8V–35V) and 500kHz max frequency, featuring enhanced thermal stability for high-power applications.
● SG2525AN (STMicroelectronics): A lower-cost variant with 100Hz–400kHz frequency range and simplified soft-start timing, suitable for cost-sensitive consumer electronics.
● UC1525AJ (Texas Instruments): Military-grade (-55°C to +125°C) PWM controller with extended temperature tolerance, ideal for aerospace and defense systems.
● SG3525ANG (ON Semiconductor): RoHS-compliant alternative with 400kHz max frequency and 18V/400mA output, optimized for compact DC-DC converters.
