B3842 Bay Linear, B3842 Datasheet

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B3842

Manufacturer Part Number
B3842
Description
Manufacturer
Bay Linear
Datasheet
Pin Connection
Bay Linear
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.
Inspire the Linear Power
Bay Linear, Inc
Current Mode PWM Controller
ISENSE
ISENSE
COMP
COMP
RT/CT
RT/CT
NC
NC
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
8-Pin Surface Mount
8-Pin Surface Mount
1
1
2
2
3
3
4
4
Top View
Top View
8
8
7
7
6
6
5
5
REF
REF
VCC
VCC
OUTPUT
OUTPUT
GND
GND
Features
Applications
Ordering Information
Z=A ON Semi Z=A1 Fairchild & Samsung
B384X(Z)M
B384X(Z)P
Devices
B3842/43/44/45A&A1
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
Switching Power Supply
Monitor
Package
8-DIP
SO-8
www.baylinear.com
0 °C to 70 °C
0 °C to 70 °C
Temp.

Related parts for B3842

B3842 Summary of contents

Page 1

... 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 ...

Page 2

... High Output Voltage V OH Rise Time t R Fall Time t F Note: Output Switch tests are performed under pulsed conditions to minimize power dissipation Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 Symbol (ANA) I SINK (E.A) ...

Page 3

... Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 =0 °C to +70°C , unless otherwise specified) A Conditions (Note 1 & (Note 1) 1 ≤25V 12V≤V CC B3842/B3844 B3843/B3845 B3842/B3844 B3843/B3845 B3842/B3843 B3844/B3845 B3842A/43A/44A/45A B3842A1/43A1/44A1/45A1 B384X MIN TYP MAX UNIT 2.85 3 3.15 V/V 0.9 1 1.1 ...

Page 4

... Figure 1: Error Amp Configuration Figure 2: Under-Voltage Lockout 3842 Figure 3: Current Sense Circuit Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 3843 B384X www.baylinear.com ...

Page 5

... Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 B384X www.baylinear.com ...

Page 6

... Figure 4: Slope Conpensation Techigues Figure 5:Latched Shutdown Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 B3842A B384X B3842A www.baylinear.com ...

Page 7

... Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 B384X www.baylinear.com ...

Page 8

... Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 B384X www.baylinear.com ...

Page 9

... Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 B384X www.baylinear.com ...

Page 10

... The application circuit examples are only to explain the representative applications of the devices and are not intended to guarantee any circuit design or permit any industrial property right to other rights to execute. Bay Linear takes no responsibility for any problems related to any industrial property right resulting from the use of the contents shown in the data book. Typical parameters can and do vary in different applications. Customer’ ...

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