UC3845ADWTR

Obsolete

Texas Instruments

IC REG CTRLR MULT TOP 16SOIC

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UC3845ADWTR

Obsolete

Texas Instruments

IC REG CTRLR MULT TOP 16SOIC

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Description Specifications Series Pricing CAD Documents

Description

General part information

UC3845 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.

Technical Specifications

Parameters and characteristics for this part

Specification	UC3845ADWTR

Applications	PWM Controller
Clock Sync	No
Current - Supply	11 mA
Duty Cycle (Max)	50 %
Frequency - Switching (Max)	500 kHz
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature (Max)	70 °C
Operating Temperature (Min)	0 °C
Output Type	PWM
Package Length	0.295 in
Package Name	16-SOIC
Package Width	7.5 mm
Topology	Forward Converter, Boost, Buck, Flyback
Voltage - Input (Maximum)	6.3 V
Voltage - Input (Minimum)	-0.3 V
Voltage - Supply (Maximum)	30 VDC
Voltage - Supply (Minimum)	7.6 V

UC3845 Series

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

Part	Package Width	Package Name	Package Length	Applications	Current - Supply	Mounting Type	Operating Temperature (Max)	Voltage - Input (Minimum)	Voltage - Input (Maximum)	Voltage - Supply (Minimum)	Voltage - Supply (Maximum)	Frequency - Switching (Max)	Number of Outputs	Duty Cycle (Max)	Topology	Clock Sync	Output Type
Texas Instruments UC3845DTR	3.9 mm	14-SOIC	0.154 in	PWM Controller	11 mA	Surface Mount	70 °C	-0.3 V	6.3 V	12 VDC	28 V
Texas Instruments UC3845D8	3.9 mm	8-SOIC	0.154 in	PWM Controller	11 mA	Surface Mount	70 °C	-0.3 V	6.3 V	12 VDC	28 V
Texas Instruments UC3845NG4	7.62 mm	8-DIP 8-PDIP	0.3 in	PWM Controller	11 mA	Through Hole	70 °C	-0.3 V	6.3 V	12 VDC	28 V
Texas Instruments UC3845D8TRG4	3.9 mm	8-SOIC	0.154 in	PWM Controller	11 mA	Surface Mount	70 °C	-0.3 V	6.3 V	12 VDC	28 V
Texas Instruments UC3845AD8	3.9 mm	8-SOIC	0.154 in	PWM Controller	11 mA	Surface Mount	70 °C	-0.3 V	6.3 V	7.6 V	30 VDC	500 kHz	1	50 %	Boost Buck Flyback Forward Converter	No	PWM
Texas Instruments UC3845AD	3.9 mm	14-SOIC	0.154 in	PWM Controller	11 mA	Surface Mount	70 °C	-0.3 V	6.3 V	7.6 V	30 VDC
Texas Instruments UC3845N	7.62 mm	8-DIP 8-PDIP	0.3 in	PWM Controller	11 mA	Through Hole	70 °C	-0.3 V	6.3 V	12 VDC	28 V
Texas Instruments UC3845ADTR	3.9 mm	14-SOIC	0.154 in	PWM Controller	11 mA	Surface Mount	70 °C	-0.3 V	6.3 V	7.6 V	30 VDC	500 kHz	1	50 %	Boost Buck Flyback Forward Converter	No	PWM
Texas Instruments UC3845AN	7.62 mm	8-DIP 8-PDIP	0.3 in	PWM Controller	11 mA	Through Hole	70 °C	-0.3 V	6.3 V	7.6 V	30 VDC	500 kHz	1	50 %	Boost Buck Flyback Forward Converter	No	PWM
Texas Instruments UC3845ANG4	7.62 mm	8-DIP 8-PDIP	0.3 in	PWM Controller	11 mA	Through Hole	70 °C	-0.3 V	6.3 V	7.6 V	30 VDC	500 kHz	1	50 %	Boost Buck Flyback Forward Converter	No	PWM

Pricing

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CAD

3D models and CAD resources for this part

Documents

Technical documentation and resources

UC3845ADWTR | Datasheet