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MIC3832

Micrel Semiconductor
Part Number MIC3832
Manufacturer Micrel Semiconductor
Description Current-Fed PWM Controllers
Published Dec 7, 2006
Detailed Description www.DataSheet4U.com MIC3832/3833 Micrel MIC3832/3833 Current-Fed PWM Controllers Not Recommended for New Designs Gen...
Datasheet PDF File MIC3832 PDF File

MIC3832
MIC3832

Overview
www.
DataSheet4U.
com MIC3832/3833 Micrel MIC3832/3833 Current-Fed PWM Controllers Not Recommended for New Designs General Description The MIC3832 and MIC3833 are unique PWM controllers designed for current-fed, multiple-output or push-pull, switched-mode power supply applications.
The MIC3832/3 features UVLO (undervoltage lockout) with hysteresis, soft start with a programmable time constant, cycle-by-cycle current limiting, a PWM latch to prevent multiple outputs due to noise or ringing, and front-edge blanking.
Current-fed topologies eliminate core saturation problems caused by shoot through (cross conduction) of push-pull circuits and reduce stress on the switching transistors.
The MIC3832/3 has one PWM stage capable of operating up to 500kHz and two output stages, Q and Q, that operate at one-half of the system frequency at a fixed 50% duty cycle.
The MIC3832 UVLO circuit permits startup when the supply is above 15.
9V and forces shutdown when the supply drops below 9.
8V.
The MIC3833 starts up above 8.
3V and shuts down below 7.
8V.
An internal 22V zener diode provides low power overvoltage protection.
The three output stages are totem-pole drivers capable of 1A peak current to external power MOSFETs, BJTs, or IGBTs.
The Q and Q outputs have an intentional 50ns overlap (no dead time).
Features • 15.
9V startup, up to 21V operation (MIC3832) 8.
3V startup, up to 21V operation (MIC3833) • 9.
8V undervoltage lockout (MIC3832) 7.
8V undervoltage lockout (MIC3833) • 0.
5mA maximum startup current (40µA typical) • 17mA typical operating current • 50ns maximum rise and fall times • 30kHz to 500kHz RC oscillator • Voltage or current-mode control • Cycle-by-cycle current limit • Soft start function • 5V 2% reference sources 20mA • Totem-pole output drive stages 1A peak output drive current • 22V zener clamp on supply pin • PWM latch eliminates false outputs from noise or ringing • Adjustable maximum duty-cycle limit • 5MHz bandwidth error amplifier 4 Applications • High-po...


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