KA3844B

Operating Supply Voltage :
Number of Outputs : 1
Mounting Style : Through Hole
Package / Case : DIP-8
Duty Cycle (Max) : 50 %
Fall Time : 35 ns
Switching Frequency : 500 KHz
Maximum Operating Temperature : + 70 C
Rise Time : 45 ns
Operating Supply Current : 17 mA


Features:

• Low Start Up Current
• Maximum Duty Clamp
• UVLO With Hysteresis
• Operating Frequency Up To 500KHz




Specifications

Product	Product status	Eco Status	Pricing*	Package type	Leads	Packing method	Package Drawing
KA3844B	Full Production	RoHS Compliant	$0.39	DIP	8	RAIL

* Fairchild 1,000 piece Budgetary Pricing

** A sample button will appear if the part is available through Fairchild's on-line samples program. If there is no sample button, please contact a Fairchild distributor to obtain samples

Characteristic	SYMBOL	RATING	UNITS
Supply Voltage	VCC	30	V
Output Current	IO	±1	A
Analog Inputs (Pin 2.3)	V(ANA)	-0.3 to 6.3	V
Error Amp Output Sink Current	ISINK (E.A)	10	mA
Power Dissipation (TA = 25°C)	PD	1	W

Description

The KA3842B/KA3843B/KA3844B/KA3845B are fixed frequency current-mode PWM controller. They are specially designed for Off-Line and DC-to-DC converter applications with minimum external components. These integrated circuits feature a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier, current sensing comparator, and a high current totempole output ideally suited for driving a power MOSFET. The KA3842B and KA3844B have UVLO thresholds of 16V (on) and 10V (off) The KA3843B and KA3845B are 8.5V (on) and 7.9V (off) The KA3842B and KA3843B can operate within 100% duty cycle. The KA3844B and KA3845B can operate with 50% duty cycle.

The KA3842B/KA3843B/KA3844B/KA3845B are fixed frequency current-mode PWM controller. They are specially designed for Off - Line and DC-to-DC converter applications with minimum external components. These integrated circuits feature a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier. current sensing comparator, and a high current totempole output Ideally suited for driving a power MOSFET. Protection circuity Includes built in under-voltage lockout and current limiting. The KA3842B and KA3844B have UVLO thresholds of 16V (on) and 10V (off) The KA3843B and KA3845B are 8.5V (on) and 7.9V (off) The KA3842B and KA3843B can operate within 100% duty cycle. The KA3844B and KA3845B can operate with 50% duty cycle.

Parameters:

Technical/Catalog Information	KA3844B
Vendor	Fairchild Semiconductor
Category	Integrated Circuits (ICs)
PWM Type	Current Mode
Number of Outputs	1
Package / Case	8-DIP
Packaging	Tube
Duty Cycle	50%
Voltage - Supply	12 V ~ 30 V
Frequency-Max	500kHz
Buck	No
Boost	No
Flyback	No
Inverting	No
Doubler	No
Divider	No
Cuk	No
Isolated	No
Drawing Number	*
Lead Free Status	Lead Free
RoHS Status	RoHS Compliant
Other Names	KA3844B KA3844B