KA3846

Duty Cycle (Max) :
Operating Supply Voltage :
Mounting Style : Through Hole
Package / Case : DIP-16
Number of Outputs : 2
Switching Frequency : 500 KHz
Maximum Operating Temperature : + 70 C
Operating Supply Current : 21 mA
Rise Time : 50000 ns
Fall Time : 50000 ns


Features:

• Automatic Feed Forward Compensation
• Programmable Pulse by Pulse Current Limiting
• Automatic Symmetry Correction in Push-Pull Configuration
• Enhanced Load Response Characteristics
• Parallel Operation Capability for Modulator Power Systems
• Differential Current Sense Amplifier with Common Mode Range
• Double Pulse Suppression
• 200mA Totem-Pole Outputs
• ±2% Band gap Reference
• Under-Voltage Lockout
• Soft-Start Capability
• Shutdown Terminal
• 500KHz Operation

Specifications

Parameter	Symbol	Value	Unit
Supply Voltage	VCC	40	V
Collector Supply Voltage	VC	40	V
Output Current, Sink of Source (Peak)	IO	500	mA
Reference Output Current	IREF	30	mA
Soft Start Sink Current	ISINK(S.S)	50	mA
Sync Output Current	ISYNC	5	mA
Error Amplifier Output Current	IO(E.A)	5	mA
Oscillator Changing Current	ICHG(OSC)	5	mA
Power Dissipation (TA = 25°C)	PD	1000	mW
Operating Temperature	TOPR	0 ~ +70	°C
Storage Temperature	TSTG	-65 ~ +150	°C
Lead Temperature (Soldering, 10sec)	TLEAD	+300	°C

Description

The KA3846 control IC provides all of the necessary features to implement fixed frequency, current mode control schemes while maintaining a minimum external parts count. The superior performance of this technique can be measured in improved line regulation, enhanced load response characteristics, and a simpler, easier-to-design control loop. Topological advantages include inherent pulse-by-pulse current limiting capability, automatic symmetry correction for push-pull converters, and the ability to parallel "power module,, while maintaining equal current sharing. Protection circuitry includes built-in-under-voltage lockout and programmable current limit in addition to soft-start capability.

A shutdown function is also available which can initiate either a complete shutdown with automatic restart or latch the supply off. Other features include fully latched operation, double pulse suppression, deadtime adjust capability, and ±2% trimmed bandgap reference. The KA3846 features low outputs in the OFF state.

Parameters:

Technical/Catalog Information	KA3846
Vendor	Fairchild Semiconductor
Category	Integrated Circuits (ICs)
PWM Type	Current Mode
Number of Outputs	2
Package / Case	16-DIP
Packaging	Tube
Duty Cycle	-
Voltage - Supply	8 V ~ 40 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	KA3846 KA3846