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B3845AM Datasheet(PDF) 1 Page - List of Unclassifed Manufacturers

Part # B3845AM
Description  Current Mode PWM Controller
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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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