UC3845 Single ended 500KHz current mode PWM controller with 8.4V/7.6V UVLO 50% duty cycle, 0C to 70C

Shipping Starts from ₹59
MPN: UC3845
Stock Status: 5 pcs
Delivery Status: 3-7 days
Including Tax: ₹3.05


Product Features

   Optimized for off-line and DC-to-DC converters
    Low start-up current (< 1 mA)
    Automatic feedforward compensation
    Pulse-by-pulse current limiting
    Enhanced load-response characteristics
    Undervoltage lockout with hysteresis
    Double-pulse suppression
    High-current totem-pole output
    Internally trimmed bandgap reference
    Up to 500-kHz operation
    Error amplifier with low output resistance

The UCx84x series of control integrated circuits provide the features that are necessary to implement off-line or DC-to-DC fixed-frequency current-mode control schemes, with a minimum number of external components. The internally implemented circuits include an undervoltage lockout (UVLO), featuring a start-up current of less than 1 mA, and a precision reference trimmed for accuracy at the error amplifier input. Other internal circuits include logic to ensure latched operation, a pulse-width modulation (PWM) comparator that also provides current-limit control, and a totem-pole output stage that is designed to source or sink high-peak current. The output stage, suitable for driving N-channel MOSFETs, is low when it is in the off state.

The UCx84x family offers a variety of package options, temperature range options, choice of maximum duty cycle, and choice of turnon and turnoff thresholds and hysteresis ranges. Devices with higher turnon or turnoff hysteresis are ideal choices for off-line power supplies, while the devices with a narrower hysteresis range are suited for DC-DC applications. The UC184x devices are specified for operation from –55°C to 125°C, the UC284x series is specified for operation from –40°C to 85°C, and the UC384x series is specified for operation from 0°C to 70°C.

Data Sheet:Click Here

Technical Data

Topology Boost, Buck, Buck-Boost, Flyback, Forward
Duty cycle (Max) (%) 50
Supply voltage (Max) (V) 28
UVLO thresholds on/off (V) 8.4/7.6
Features Adjustable Switching Frequency, Current Limiting, Dead Time Control, Error Amplifier, Multi-topology
Operating temperature range (C) 0 to 70
Rating Catalog Frequency (Max) (kHz) 500
Gate drive (Typ) (A) 1

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