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UC2844AQD8R Datasheet

  • UC2844AQD8R

  • Current Mode PWM Controller

  • 7頁(yè)

  • TI

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UC1842A/3A/4A/5A
UC2842A/3A/4A/5A
UC3842A/3A/4A/5A
Current Mode PWM Controller
FEATURES
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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
Part #
UVLO On
16.0V
8.5V
16.0V
8.5V
UVLO Off
10.0V
7.9V
10.0V
7.9V
Maximum Duty
Cycle
<100%
<100%
<50%
<50%
DESCRIPTION
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 V
CC
over 5V.
The difference between members of this family are shown in the table
below.
High Current Totem Pole Output
Internally Trimmed Bandgap Reference
500kHz Operation
Low R
O
Error Amp
UC1842A
UC1843A
UC1844A
UC1845A
BLOCK DIAGRAM
Note 1: A/B A = DIL-8 Pin Number. B = SO-14 Pin Number.
Note 2: Toggle flip flop used only in 1844A and 1845A.
9/94

UC2844AQD8R 產(chǎn)品屬性

  • 1

  • 集成電路 (IC)

  • PMIC - AC-DC 轉(zhuǎn)換器，離線開關(guān)

  • -

  • *

  • *

  • *

  • *

  • *

  • *

  • 8-SOIC（0.154"，3.90mm 寬）

  • *

  • Digi-Reel®

  • 296-15683-6

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