Specification	TL3845BD

Clock Sync	False
Control Features	Frequency Control
Duty Cycle (Max) [Max]	48 %
Frequency - Switching	100 kHz
Function	Step-Up, Step-Up/Step-Down
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature [Max]	70 °C
Operating Temperature [Min]	0 °C
Output Configuration	Positive
Output Phases	1
Output Type	Transistor Driver
Package / Case	14-SOIC
Package / Case [x]	0.154 in
Package / Case [y]	3.9 mm
Synchronous Rectifier	False
Topology	Flyback, Boost, Forward Converter
Voltage - Supply (Vcc/Vdd) [Max]	30 V
Voltage - Supply (Vcc/Vdd) [Min]	7.6 V

TL3845B Series

30-V, 0.2A high Performance 500KHz current mode PWM with 8.4V/7.6V UVLO, 50% duty cycle, 0C to 70C

Part	Frequency - Switching	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Number of Outputs	Supplier Device Package	Qualification	Grade	Function	Output Type	Output Phases	Control Features	Output Configuration	Duty Cycle (Max) [Max]	Topology	Package / Case	Package / Case [y]	Package / Case [x]	Operating Temperature [Max]	Mounting Type	Package / Case	Package / Case
Texas Instruments TL3845DR-8	100 kHz	7.6 V	30 V	1	8-SOIC	AEC-Q100	Automotive	Step-Up Step-Up/Step-Down	Transistor Driver	1	Frequency Control	Positive	48 %	Boost Flyback Forward Converter	8-SOIC	3.9 mm	0.154 in	70 °C	Surface Mount
Texas Instruments TL3845PG4	100 kHz	7.6 V	30 V	1	8-PDIP	AEC-Q100	Automotive	Step-Up Step-Up/Step-Down	Transistor Driver	1	Frequency Control	Positive	48 %	Boost Flyback Forward Converter	8-DIP			70 °C	Through Hole	0.3 in	7.62 mm
Texas Instruments TL3845BD-8	100 kHz	7.6 V	30 V	1	8-SOIC			Step-Up Step-Up/Step-Down	Transistor Driver	1	Frequency Control	Positive	48 %	Boost Flyback Forward Converter	8-SOIC	3.9 mm	0.154 in	70 °C	Surface Mount
Texas Instruments TL3845BDR	100 kHz	7.6 V	30 V	1				Step-Up Step-Up/Step-Down	Transistor Driver	1	Frequency Control	Positive	48 %	Boost Flyback Forward Converter	14-SOIC	3.9 mm	0.154 in	70 °C	Surface Mount
Texas Instruments TL3845BDR-8	100 kHz	7.6 V	30 V	1	8-SOIC			Step-Up Step-Up/Step-Down	Transistor Driver	1	Frequency Control	Positive	48 %	Boost Flyback Forward Converter	8-SOIC	3.9 mm	0.154 in	70 °C	Surface Mount
Texas Instruments TL3845DR	100 kHz	7.6 V	30 V	1		AEC-Q100	Automotive	Step-Up Step-Up/Step-Down	Transistor Driver	1	Frequency Control	Positive	48 %	Boost Flyback Forward Converter	14-SOIC	3.9 mm	0.154 in	70 °C	Surface Mount
Texas Instruments TL3845P	100 kHz	7.6 V	30 V	1	8-PDIP	AEC-Q100	Automotive	Step-Up Step-Up/Step-Down	Transistor Driver	1	Frequency Control	Positive	48 %	Boost Flyback Forward Converter	8-DIP			70 °C	Through Hole	0.3 in	7.62 mm
Texas Instruments TL3845BDG4-8	100 kHz	7.6 V	30 V	1	8-SOIC			Step-Up Step-Up/Step-Down	Transistor Driver	1	Frequency Control	Positive	48 %	Boost Flyback Forward Converter	8-SOIC	3.9 mm	0.154 in	70 °C	Surface Mount
Texas Instruments TL3845BP	100 kHz	7.6 V	30 V	1	8-PDIP			Step-Up Step-Up/Step-Down	Transistor Driver	1	Frequency Control	Positive	48 %	Boost Flyback Forward Converter	8-DIP			70 °C	Through Hole	0.3 in	7.62 mm
Texas Instruments TL3845BD	100 kHz	7.6 V	30 V	1				Step-Up Step-Up/Step-Down	Transistor Driver	1	Frequency Control	Positive	48 %	Boost Flyback Forward Converter	14-SOIC	3.9 mm	0.154 in	70 °C	Surface Mount

Pricing

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

Distributor	Package	Quantity	$

Digikey	Tube	1	$ 1.33
		10	$ 1.19
		50	$ 1.13
		100	$ 0.93
		250	$ 0.87
		500	$ 0.77
Texas Instruments	TUBE	1	$ 1.15
		100	$ 0.78
		250	$ 0.60
		1000	$ 0.40

Description

General part information

TL3845B Series

The TL284xB and TL384xB 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. Internally implemented circuits include an undervoltage lockout (UVLO) and a precision reference that is 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 designed to source or sink high-peak current. The output stage, suitable for driving N-channel MOSFETs, is low when the output stage is in the off state.

The TL284xB and TL384xB series are pin compatible with the standard TL284x and TL384x with the following improvements. The start-up current is specified to be 0.5mA (max), while the oscillator discharge current is trimmed to 8.3mA (typ). In addition, during undervoltage lockout conditions, the output has a maximum saturation voltage of 1.2V while sinking 10mA (VCC = 5V).

Major differences between members of these series are the UVLO thresholds and maximum duty-cycle ranges. Typical UVLO thresholds of 16V (on) and 10V (off) on the TLx842B and TLx844B devices make them ideally suited to off-line applications. The corresponding typical thresholds for the TLx843B and TLx845B devices are 8.4V (on) and 7.6V (off). The TLx842B and TLx843B devices can operate to duty cycles approaching 100%. A duty-cycle range of 0% to 50% is obtained by the TLx844B and TLx845B by the addition of an internal toggle flip-flop, which blanks the output off every other clock cycle. The TL284xB-series devices are characterized for operation from –40°C to 85°C. The TL384xB-series devices are characterized for operation from 0°C to 70°C.