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SG3525

Name: SG3525
Rating: 4.7 (12 reviews)

IC VREF SERIES 5.1V +/-1% 16SOIC

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Mfr。パート #SG3525
パッケージ
データシート
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仕様

Part Status	Active
Reference Type	Series
Output Type	Fixed
Voltage - Output (Min/Fixed)	5.1V
Current - Output	400 mA
Tolerance	±1%
Voltage - Input	8V ~ 35V
Current - Supply	20mA
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Package	16-SOIC (0.154", 3.90mm Width)
Supplier Device Package	16-SOP
Packaging	Cut Tape (CT), Tape & Reel (TR)

概要

Description

SG3525 is a classic PWM controller IC for switch‑mode power supplies. It combines:
- A 5V precision reference
- Two error amplifiers for feedback/comparison
- An oscillator (RT/CT) to set the switching frequency (typical SMPS range from a few kHz to tens of kHz)
- A dead-time control input (to set minimum off time)
- A PWM comparator that modulates duty cycle
- A dual totem-pole output stage that can be wired push-pull or parallel to drive primary switches
It’s commonly used in flyback and forward converters and other topologies, with feedback from the secondary through an optocoupler into the error amps. Optional current-sense input allows current‑mode control. External compensation networks around the error amplifiers shape the loop response. In short, SG3525 is a versatile, widely available SMPS controller suitable for primary-side control with good flexibility for various topologies.

Features

SG3525 is a dual PWM controller for switching power supplies. Key features:
- Wide supply range: typically 8–40 V with undervoltage lockout.
- 5 V reference and two error amplifiers for feedback control.
- External oscillator via RT/CT to set frequency (typical 20–50 kHz range; adjustable).
- PWM comparator provides duty cycle control from error amps.
- Dead-time control input to prevent cross-conduction.
- Dual outputs (O1, O2) that can operate push-pull or be paralleled for higher drive current.
- Current-sense/feedback input for protection and current-mode control.
- Internal protections and fault handling suitable for flyback, forward, and push-pull topologies.
- Suitable for compact, economical SMPS designs with simple feedback loops.

Package

SG3525 is a 16-pin PWM controller. Common package types: DIP-16 (PDIP) and SO-16 (SOP).

Pinout

- Pin count: 16 pins (DIP-16 / SO-16).
- Function: SG3525 is a dual PWM controller for switching-mode power supplies. It provides two error amplifiers, a 5V reference, an adjustable oscillator (frequency set by RT and CT), a dead-time control, and a PWM comparator that drives a totem-pole output stage (two outputs that can be used push-pull or paralleled). It accepts current-sense/feedback signals and includes basic protection features for SMPS operation.

Manufacturer

- Manufacturer: Sanyo Electric Co., Ltd. (the SG3525 was originally produced by Sanyo)
- What kind of company: A Japanese electronics/semiconductor company (Sanyo is now part of Panasonic Corporation).

Application

SG3525 is a dual PWM controller for switch‑mode power supplies. Applications include:
- Isolated/non-isolated SMPS topologies: flyback, forward, push-pull, half-bridge
- DC‑DC converters: buck, boost, buck‑boost
- Desktop/telecom power adapters, battery chargers
- LED constant-current drivers
- General PWM regulation in low–medium power supplies (tens of watts), typically 20–60 kHz.

Equivalent

Common equivalents for SG3525 (dual PWM controller):
- TL494 / TL494A (Texas Instruments)
- UC3525 / UC3525A (Intersil/Unitrode)
- KA3525 (Renesas)
- UC3842 / UC3843 / UC3844 (Intersil/ON Semiconductor) — related PWM families
Note: pinouts and features vary; compatibility may require tweaks or circuit adjustments.