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UC2844DTR Fiches technique(PDF) 11 Page - Texas Instruments

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No de pièce UC2844DTR
Description  Current-Mode PWM Controllers
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

UC2844DTR Fiches technique(HTML) 11 Page - Texas Instruments

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UCx842
UCx843
34 V
5-V
Reference
EN
VREF Good
Logic
Internal
Bias
UVLO
Osc
S
R
PWM
Latch
R
1 V
+
E/A
VCC
GROUND
RT/CT
VFB
COMP
ISENSE
PWM
Comparator
VREF
OUTPUT
VC
PWRGND
2R
2.5 V
Copyright © 2016, Texas Instruments Incorporated
11
UC1842, UC2842, UC3842, UC1843, UC2843, UC3843
UC1844, UC2844, UC3844, UC1845, UC2845, UC3845
www.ti.com
SLUS223D – APRIL 1997 – REVISED AUGUST 2016
Product Folder Links: UC1842 UC2842 UC3842 UC1843 UC2843 UC3843 UC1844 UC2844 UC3844 UC1845
UC2845 UC3845
Submit Documentation Feedback
Copyright © 1997–2016, Texas Instruments Incorporated
8 Detailed Description
8.1 Overview
The UCx84x series of control integrated circuits provide the features necessary to implement AC-DC or DC-to-
DC fixed-frequency current-mode control schemes with a minimum number of external components. Protection
circuitry includes undervoltage lockout (UVLO) and current limiting. Internally implemented circuits include a
start-up current of less than 1 mA, a precision reference trimmed for accuracy at the error amplifier input, logic to
ensure latched operation, a pulse-width modulation (PWM) comparator that also provides current-limit control,
and a totem-pole output stage designed to source or sink high-peak current. The output stage, suitable for driving
N-channel MOSFETs, is low when it is in the off-state.
Major differences between members of these series are the UVLO thresholds, acceptable ambient temperature
range, and maximum duty-cycle. Typical UVLO thresholds of 16 V (ON) and 10 V (OFF) on the UCx842 and
UCx844 devices make them ideally suited to off-line AC-DC applications. The corresponding typical thresholds
for the UCx843 and UCx845 devices are 8.4 V (ON) and 7.6 V (OFF), making them ideal for use with regulated
input voltages used in DC-DC applications. The UCx842 and UCx843 devices operate to duty cycles
approaching 100%. The UCx844 and UCx845 obtain a duty-cycle range of 0% to 50% by the addition of an
internal toggle flip-flop, which blanks the output off every other clock cycle.
The UC184x-series devices are characterized for operation from –55°C to 125°C. UC284x-series devices are
characterized for operation from
−40°C to 85°C. The UC384x devices are characterized for operation from 0°C to
70°C.
8.2 Functional Block Diagrams
Figure 11. UCx842 and UCx843 Block Diagram, No Toggle


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