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UC3842 Series

Current Mode PWM

Manufacturer: Texas Instruments

Catalog(10 parts)

PartApplicationsCurrent - Supply▲▼Voltage - Input▲▼Voltage - Input▲▼Operating Temperature▲▼Operating Temperature▲▼Mounting TypeSupplier Device PackagePackage / Case▲▼Package / CaseVoltage - Supply▲▼Voltage - Supply▲▼Package / Case▲▼Package / Case▲▼Output TypeNumber of Outputs▲▼Output Phases▲▼Duty Cycle (Max)▲▼Clock Sync▲▼Control FeaturesVoltage - Supply (Vcc/Vdd)▲▼Voltage - Supply (Vcc/Vdd)▲▼Output ConfigurationFunctionSynchronous Rectifier▲▼Topology
Texas Instruments
UC3842AD8
Power Supply Controller PWM Controller 8-SOIC
PWM Controller
0.010999999940395355 A
-3 V
6.300000190734863 V
70 °C
0 °C
Surface Mount
8-SOIC
0.003899999894201755 m
8-SOIC
30 V
10 V
Texas Instruments
UC3842AD
Power Supply Controller PWM Controller 14-SOIC
PWM Controller
0.010999999940395355 A
-3 V
6.300000190734863 V
70 °C
0 °C
Surface Mount
14-SOIC
30 V
10 V
0.003899999894201755 m
0.003911599982529879 m
Texas Instruments
UC3842AD8TRG4
Power Supply Controller PWM Controller 8-SOIC
PWM Controller
0.010999999940395355 A
-3 V
6.300000190734863 V
70 °C
0 °C
Surface Mount
8-SOIC
0.003899999894201755 m
8-SOIC
30 V
10 V
Texas Instruments
UC3842ADTR
Power Supply Controller PWM Controller 14-SOIC
PWM Controller
0.010999999940395355 A
-3 V
6.300000190734863 V
70 °C
0 °C
Surface Mount
14-SOIC
30 V
10 V
0.003899999894201755 m
0.003911599982529879 m
Texas Instruments
UC3842DG4
Boost, Buck, Buck-Boost, Flyback, Forward Regulator Positive, Isolation Capable Output Step-Up, Step-Down, Step-Up/Step-Down DC-DC Controller IC 14-SOIC
70 °C
0 °C
Surface Mount
14-SOIC
0.003899999894201755 m
0.003911599982529879 m
Transistor Driver
1 ul
1 ul
0.9700000286102296 ul
Frequency Control
30 V
10 V
Isolation Capable, Positive
Step-Down, Step-Up, Step-Up/Step-Down
Boost, Buck, Buck-Boost, Flyback, Forward
Texas Instruments
UC3842D8
Power Supply Controller PWM Controller 8-SOIC
PWM Controller
0.010999999940395355 A
-3 V
6.300000190734863 V
70 °C
0 °C
Surface Mount
8-SOIC
0.003899999894201755 m
8-SOIC
28 V
12 V
Texas Instruments
UC3842ADW
Power Supply Controller PWM Controller 16-SOIC
PWM Controller
0.010999999940395355 A
-3 V
6.300000190734863 V
70 °C
0 °C
Surface Mount
16-SOIC
16-SOIC
30 V
10 V
Texas Instruments
UC3842J
Power Supply Controller
Texas Instruments
UC3842ADG4
Power Supply Controller PWM Controller 14-SOIC
PWM Controller
0.010999999940395355 A
-3 V
6.300000190734863 V
70 °C
0 °C
Surface Mount
14-SOIC
30 V
10 V
0.003899999894201755 m
0.003911599982529879 m
Texas Instruments
UC3842AD8TR
Power Supply Controller PWM Controller 8-SOIC
PWM Controller
0.010999999940395355 A
-3 V
6.300000190734863 V
70 °C
0 °C
Surface Mount
8-SOIC
0.003899999894201755 m
8-SOIC
30 V
10 V

Description

AI
The UC284xB family of control ICs provides the necessary features to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuits include a trimmed oscillator for precise DUTY CYCLE CONTROL under voltage lockout featuring start-up current less than 0.5mA, a precision reference trimmed for accuracy at the error amp input, logic to insure latched operation, a PWM comparator which also provides current limit control, and a totem pole output stage designed to source or sink high peak current. The output stage, suitable for driving N-Channel MOSFETs, is low in the off-state. Differences between members of this family are the under-voltage lockout thresholds and maximum duty cycle ranges. The UC2842B and UC2844B have UVLO thresholds of 16V (on) and 10V (off), ideally suited off-line applications The corresponding thresholds for the UC2843B and UC2845B are 8.5V and 7.9V. The UC2842B and UC2843B can operate to duty cycles approaching 100%. A range of the zero to < 50 % is obtained by the UC2844B and UC2845B by the addition of an internal toggle flip flop which blanks the output off every other clock cycle.