AX3842S

Features:

• Trimmed Oscillator for Precise Frequency Control
• Oscillator Frequency Guaranteed at 250 kHz
• Current Mode Operation to 500 kHz
• Automatic Feed Forward Compensation
• Latching PWM for Cycle-By-Cycle Current Limiting
• Internally Trimmed Reference with Undervoltage Lockout
• High Current Totem Pole Output
• Undervoltage Lockout with Hysteresis
• Low Startup and Operating Current


Specifications

Symbol	Parameter	Value	Unit
Vi	Supply Voltage (low impedance source)	30	V
Vi	Supply Voltage (Ii<30mA)	Self Limiting
IO	Output Current	±1	A
EO	Output Energy (capacitive load)	5	uJ
	Analog Inputs (pin 2, 3)	-0.3 to 5.5	V
	Error Amplifier Output Sink Current	10	mA
Ptot	Power Dissipation at Tamb25oC	800	mW
Tstg	Storage Temperature Range	-65 to 150
TJ	Junction Operating Temperature	-40 to 150
TL	Lead Temperature (soldering 10s)	300

Description

The AX3842 Series is high performance fixed frequency current mode controllers.That is specifically designed for Off Line and DC To DC converter applications offering the designer a costeffective solution with minimal external components.These integrated circuits feature a trimmed oscillator for precise duty cycle control.A temperature compensated reference, high gain error amplifier, current sensing compara-tor, and a high current totem pole output ideally suited for driving a power MOSFET. Also included are protective features consisting of input and reference undervoltage lockouts each with hysteresis, cycle-by-cycle current limiting, programmable output deadtime, and a latch for single pulse metering.