B3842A1

Features:

•  Low Start-Up and Operating Current
•  Maximum Duty Cycle
•  Operating Frequency Up to 500KHz
•  Under voltage Lockout with Hysteresis
•  Available in 8 pin SOIC 
•  Similar to industry Standard UC3842


Application

•  Switching Power Supply
•  Monitor


Pinout

Devices	Package	Temp.
B384X(Z)M	SO-8	0 °C to 70 °C
B384X(Z)P	8-DIP	0 °C to 70 °C

Specifications

Parameter	Symbol	Value	Unit
Supply Voltage	VCC	30	V
Output Current	IO	±1	A
Analog Input (pin 2,3)	V(ANA)	-0.3 to 6.3	V
Error Amp Output Sink Current	ISINK (E.A)	10	mA
Power Dissipation	PD	1	W
Storage Temperature Range	T	-65 to 150	°C
Lead Temperature (Soldering 10 Sec.)	TL	260	°C

 


Description

 
 
 
 
 
 
 
 
The Bay Linear B3842/43/44/45 are fixed frequency current-mode PWM controller. These  B3842/43/44/45  are designed for Off-Line and DC-to-DC converter  applications with minimum external components. The B3842 family 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 N-Channel MOSFET's.  It is low when is on off stage. Protection circuitry includes built in under-voltage lockout and current limiting. 
 
Major differences between members of B3842/43/44/45 are the UVLO thresholds and maximum  duty-cycle ranges. Typical UVLO thresholds of 16V (on) and 10V (off) on the B3842 and B3844 devices make them ideally suited to off line applications. These  corresponding typical thresholds for the B3842 and B3845 devcies are 8.4V (on) and 7.6V (off). The B3842 and B3843 devcies can operate to duty cycles approaching 100%. A duty-Cycle range of 0 to 50% is obtained by the B3844 and B3845 by the addition of an internal toggle flip-flop, which blanks the output off every other clock cycle.  The B3842/43/44/45 is available in 8 pin DIP and SOIC packages.