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UC3844AD - 14-SOIC

UC3844AD

Active
Texas Instruments

30-V, 1A, 500KHZ CURRENT MODE PWM CONTROLLER WITH 16V/10V UVLO 50% DUTY CYCLE, 0°C TO 70°C

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Search across all available documentation for this part.

DocumentsConditioning a Switch-mode Power Supply Current Signal Using TI Op Amps (Rev. A)DN-40 The Effects of Oscillator Discharge Current Variations on Maximum Duty+10
UC3844AD - 14-SOIC

UC3844AD

Active
Texas Instruments

30-V, 1A, 500KHZ CURRENT MODE PWM CONTROLLER WITH 16V/10V UVLO 50% DUTY CYCLE, 0°C TO 70°C

Deep-Dive with AI

DocumentsConditioning a Switch-mode Power Supply Current Signal Using TI Op Amps (Rev. A)DN-40 The Effects of Oscillator Discharge Current Variations on Maximum Duty+10

Technical Specifications

Parameters and characteristics for this part

SpecificationUC3844AD
ApplicationsPWM Controller
Current - Supply11 mA
Mounting TypeSurface Mount
Operating Temperature [Max]70 °C
Operating Temperature [Min]0 °C
Package / Case14-SOIC
Package / Case [x]0.154 in
Package / Case [y]3.9 mm
Voltage - Input [Max]6.3 V
Voltage - Input [Min]-3 V
Voltage - Supply [Max]30 VDC
Voltage - Supply [Min]10 VDC

UC3844A Series

Single ended 500KHz current mode PWM controller with 16V/10V UVLO 50% duty cycle, 0C to 70C

PartPackage / Case [x]Package / Case [y]Package / CaseApplicationsCurrent - SupplyMounting TypeVoltage - Input [Min]Voltage - Input [Max]Voltage - Supply [Max]Voltage - Supply [Min]Operating Temperature [Max]Operating Temperature [Min]Package / CasePackage / CaseSupplier Device Package
Texas Instruments
UC3844DTR
0.154 in
3.9 mm
14-SOIC
PWM Controller
11 mA
Surface Mount
-3 V
6.3 V
28 V
12 V
70 °C
0 °C
Texas Instruments
UC3844AN
8-DIP
Through Hole
70 °C
0 °C
0.3 in
7.62 mm
8-PDIP
Texas Instruments
UC3844AD8
0.154 in
3.9 mm
8-SOIC
PWM Controller
11 mA
Surface Mount
-3 V
6.3 V
30 VDC
10 VDC
70 °C
0 °C
8-SOIC
Texas Instruments
UC3844AD8G4
0.154 in
3.9 mm
8-SOIC
PWM Controller
11 mA
Surface Mount
-3 V
6.3 V
30 VDC
10 VDC
70 °C
0 °C
8-SOIC
Texas Instruments
UC3844D
0.154 in
3.9 mm
14-SOIC
PWM Controller
11 mA
Surface Mount
-3 V
6.3 V
28 V
12 V
70 °C
0 °C
Texas Instruments
UC3844AD8TRG4
0.154 in
3.9 mm
8-SOIC
PWM Controller
11 mA
Surface Mount
-3 V
6.3 V
30 VDC
10 VDC
70 °C
0 °C
8-SOIC
Texas Instruments
UC3844ADTR
0.154 in
3.9 mm
14-SOIC
PWM Controller
11 mA
Surface Mount
-3 V
6.3 V
30 VDC
10 VDC
70 °C
0 °C
Texas Instruments
UC3844D8TRG4
0.154 in
3.9 mm
8-SOIC
PWM Controller
11 mA
Surface Mount
-3 V
6.3 V
28 V
12 V
70 °C
0 °C
8-SOIC
Texas Instruments
UC3844AD
0.154 in
3.9 mm
14-SOIC
PWM Controller
11 mA
Surface Mount
-3 V
6.3 V
30 VDC
10 VDC
70 °C
0 °C
Texas Instruments
UC3844D8TR
0.154 in
3.9 mm
8-SOIC
PWM Controller
11 mA
Surface Mount
-3 V
6.3 V
28 V
12 V
70 °C
0 °C
8-SOIC

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

DistributorPackageQuantity$
DigikeyTube 1$ 1.27
10$ 1.14
50$ 1.08
100$ 0.89
250$ 0.83
500$ 0.73
1000$ 0.58
2500$ 0.54
2500$ 2.17
5000$ 0.51
Texas InstrumentsTUBE 1$ 1.05
100$ 0.81
250$ 0.60
1000$ 0.43

Description

General part information

UC3844A Series

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 1mA, and a precision reference trimmed for accuracy at the error amplifier input. Other internal circuits include logic to provide 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, designed for driving N-channel MOSFETs, is low when the output stage 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 good choices for off-line power supplies, while the devices with a narrower hysteresis range are designed 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 1mA, and a precision reference trimmed for accuracy at the error amplifier input. Other internal circuits include logic to provide 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, designed for driving N-channel MOSFETs, is low when the output stage is in the off state.