SG3843G Datasheet BiCMOS Green-Mode PWM Controllers

Manufacturer: System General

Overview: Product Specification BiCMOS Green-Mode PWM Controllers SG3842G/ 3843G/ 3844G/ 3845G start-up current has been reduced to 5uA, and the minimum operating current has been reduced to 5mA. Each SG384xG has a slew rate controlled high current totem pole output, ideally suited for driving a power MOSFET while keeping EMI low. The current-sense propagation delay is typically 50ns, resulting in significantly more effective constant power protection. During normal operation, a SG384xG controller acts as a fixed frequency PWM controller. The PWM frequency can be easily programmed by changing external RT and CT values. The SG384xG includes two Green-mode functions that dramatically reduce power usage, helping the power supply comply with the latest international power saving guidelines. To cut power consumption under light load conditions, the controller’s Green-mode function will linearly decrease the PWM frequency in response to decreases in the output load. Under ultra light-load/zero-load conditions, the RT/CT PWM oscillator periodically shuts down, and enters into Burst-mode. This causes the IC’s supply voltage to begin gradually dropping. Just before the supply voltage drops below the UVLO voltage threshold, the RT/CT PWM oscillator turns back on, to prevent the supply voltage from going below the UVLO voltage. SG384xG controllers also come with Over Voltage Protection (OVP). This shuts down PWM output if the supply voltage ever exceeds 27V. The SG384xG series comes in 8-pin DIP and SOP packages.

Download the SG3843G datasheet PDF. This datasheet also includes the SG3842G variant, as both parts are published together in a single manufacturer document.

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SG3843G bicmos green-mode pwm controllers by System General - Datasheet Preview

Datasheet Details

Part number	SG3843G
Manufacturer	System General
File Size	239.41 KB
Description	BiCMOS Green-Mode PWM Controllers
Download	SG3843G Download (PDF)

General Description

The SG348xG series of current-mode PWM con

Key Features

384x series pin-to-pin compatible Linearly decreasing PWM frequency Burst-mode at low/zero load 5uA start-up current 5mA operating current Vcc over voltage protection Cycle-by-cycle current limiting Zero cross-conduction Slew rate controlled high current totem pole output Fast current sense propagation delay Under voltage lockout (UVLO) with hysteresis.

More Datasheets from System General

Part Number	Description
SG3842G	BiCMOS Green-Mode PWM Controllers
SG3844G	BiCMOS Green-Mode PWM Controllers
SG3845G	BiCMOS Green-Mode PWM Controllers