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UC2842A Datasheet(PDF) 1 Page - Texas Instruments

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Part No. UC2842A
Description  Current Mode PWM Controller
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
Logo TI - Texas Instruments

UC2842A Datasheet(HTML) 1 Page - Texas Instruments

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9/94
Optimized for Off-line and DC to DC
Converters
Low Start Up Current (<0.5mA)
Trimmed Oscillator Discharge Current
Automatic Feed Forward Compensation
Pulse-by-Pulse Current Limiting
Enhanced Load Response Characteristics
Under-Voltage Lockout With Hysteresis
Double Pulse Suppression
High Current Totem Pole Output
Internally Trimmed Bandgap Reference
500kHz Operation
Low RO Error Amp
Current Mode PWM Controller
The UC1842A/3A/4A/5A family of control ICs is a pin for pin compat-
ible improved version of the UC3842/3/4/5 family. Providing the nec-
essary features to control current mode switched mode power
supplies, this family has the following improved features. Start up cur-
rent is guaranteed to be less than 0.5mA. Oscillator discharge is
trimmed to 8.3mA. During under voltage lockout, the output stage can
sink at least 10mA at less than 1.2V for VCC over 5V.
The difference between members of this family are shown in the table
below.
UC1842A/3A/4A/5A
UC2842A/3A/4A/5A
UC3842A/3A/4A/5A
BLOCK DIAGRAM
FEATURES
DESCRIPTION
Part #
UVLO On
UVLO Off
Maximum Duty
Cycle
UC1842A
16.0V
10.0V
<100%
UC1843A
8.5V
7.9V
<100%
UC1844A
16.0V
10.0V
<50%
UC1845A
8.5V
7.9V
<50%
Note 1:
A = DIL-8 Pin Number. B = SO-14 Pin Number.
Note 2: Toggle flip flop used only in 1844A and 1845A.
A/B


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