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UC3844D Texas Instruments
Texas Instruments
Texas Instruments Incorporated (TI) is a global semiconductor powerhouse, crafts advanced analog ICs and embedded processors. Fueled by top-tier minds, TI's innovations drive tech's future, impacting 100,000+ clients.
View All Product from Texas InstrumentsThe 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.
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.
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TYPE | DESCRIPTION | Select all |
---|---|---|
Package | Tube | |
Product Status | Obsolete | |
Output Type | Transistor Driver | |
Function | Step-Up, Step-Down, Step-Up/Step-Down | |
Output Configuration | Positive, Isolation Capable | |
Topology | Boost, Buck, Buck-Boost, Flyback, Forward | |
Number of Outputs | 1 | |
Output Phases | 1 | |
Voltage - Supply (Vcc/Vdd) | 10V ~ 30V | |
Frequency - Switching | Up to 500kHz | |
Duty Cycle (Max) | 48% | |
Synchronous Rectifier | No | |
Clock Sync | No | |
Control Features | Frequency Control | |
Operating Temperature | 0°C ~ 70°C (TA) | |
Mounting Type | Surface Mount | |
Package / Case | 14-SOIC (0.209", 5.30mm Width) | |
Supplier Device Package | 14-SOP |
Texas Instruments
Texas Instruments Incorporated (TI) is a global semiconductor powerhouse, crafts advanced analog ICs and embedded processors. Fueled by top-tier minds, TI's innovations drive tech's future, impacting 100,000+ clients.
View All Product from Texas InstrumentsSWITCHING CONTROLLER
UC3844 CURRENT-MODE PWM CONTROLL
IC REG CTRLR PWM CM 14-SOIC
IC REG CTRLR PWM CM 8SOIC
IC REG CTRLR PWM CM 14-SOIC
IC REG CTRLR PWM CM 8SOIC
SWITCHING CONTROLLER
IC REG CTRLR BUCK 8VSSOP
IC REG CTRLR MULT TOP 16SOIC
IC REG CTRLR MULT TOP 16SOIC