B3842AP Bay Linear, Inc., B3842AP Datasheet

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B3842AP

Manufacturer Part Number
B3842AP
Description
Current Mode PWM, 0.17mA Start-up Supply Current, DIP
Manufacturer
Bay Linear, Inc.
Datasheet
1.B3842AP.pdf (10 pages)
Pin Connection
Bay Linear
Bay Linear
Bay Linear
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 L
Inspire the Linear Power
Bay Linear, Inc
Inspire the L
Inspire the L
inear Power
inear Power
inear Power
Current Mode PWM Controller
ISENSE
ISENSE
COMP
COMP
RT/CT
RT/CT
NC
NC
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, 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.

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B3842AP Summary of contents

Page 1

Bay Linear Bay Linear Bay Linear Bay Linear Inspire the L Inspire the Linear Power Inspire the L Inspire the L inear Power inear Power inear Power Current Mode PWM Controller Description The Bay Linear B3842/43/44/45 are fixed frequency current- ...

Page 2

Absolute Maximum Rating Parameter Supply Voltage Output Current Analog Input (pin 2,3) Error Amp Output Sink Current Power Dissipation Storage Temperature Range Lead Temperature (Soldering 10 Sec.) Electrical Characteristics (V = 15V 3.3nF ...

Page 3

Electrical Characteristics (V = 15V 3.3nF Parameter Symbol CURRENT SENSE SECTION Gain G V Maximum input Signal V I(MAX) Power Supply Rejection PSRR Ratio Input Bias Current I BIAS UNDER-VOLTAGE LOCKOUT ...

Page 4

Figure 1: Error Amp Configuration Figure 2: Under-Voltage Lockout 3842 Figure 3: Current Sense Circuit Bay Linear, Inc 2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556 3843 B384X www.baylinear.com ...

Page 5

Bay Linear, Inc 2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556 B384X www.baylinear.com ...

Page 6

Figure 4: Slope Conpensation Techigues Figure 5:Latched Shutdown Bay Linear, Inc 2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556 B3842A B384X B3842A www.baylinear.com ...

Page 7

Bay Linear, Inc 2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556 B384X www.baylinear.com ...

Page 8

Bay Linear, Inc 2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556 B384X www.baylinear.com ...

Page 9

Bay Linear, Inc 2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556 B384X www.baylinear.com ...

Page 10

Advance Information- These data sheets contain descriptions of products that are in development. The specifications are based on the engineering calculations, computer simulations and/ or initial prototype evaluation. Preliminary Information- These data sheets contain minimum and maximum specifications that are ...

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