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B3845AM Datasheet(PDF) 1 Page - List of Unclassifed Manufacturers |
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1 / 10 page Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com Current Mode PWM Controller B3842/43/44/45A&A1 Pin Connection Ordering Information Devices Package Temp. B384X(Z)M SO-8 0 °C to 70 °C B384X(Z)P 8-DIP 0 °C to 70 °C Z=A ON Semi Z=A1 Fairchild & Samsung Description The Bay Linear B3842/43/44/45 are fixed frequency current- mode PWM controller. These devices 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 these series 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. It id available in 8 pin DIP and SOIC packages. 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 Applications • Switching Power Supply • Monitor 2 1 3 4 8 7 6 5 8-Pin Surface Mount Top View COMP ISENSE RT/CT GND VCC OUTPUT REF NC 2 1 3 4 8 7 6 5 8-Pin Surface Mount Top View COMP ISENSE RT/CT GND VCC OUTPUT REF NC Bay Linear Inspire the Linear Power |
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