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UC2845AD8G4 Fiches technique(PDF) 10 Page - Texas Instruments

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No de pièce UC2845AD8G4
Description  Current-Mode PWM Controller
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

UC2845AD8G4 Fiches technique(HTML) 10 Page - Texas Instruments

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UC1842A, UC1843A, UC1844A, UC1845A
UC2842A, UC2843A, UC2844A, UC2845A
UC3842A, UC3843A, UC3844A, UC3845A
SLUS224E – SEPTEMBER 1994 – REVISED JULY 2016
www.ti.com
Product Folder Links: UC1842A UC1843A UC1844A UC1845A UC2842A UC2843A UC2844A UC2845A UC3842A
UC3843A UC3844A UC3845A
Submit Documentation Feedback
Copyright © 1994–2016, Texas Instruments Incorporated
Feature Description (continued)
Figure 3. Current Sense Circuit Diagram
8.3.3 Error Amplifier Configuration
The error amplifier can source up to 0.8 mA, and sink up to 6 mA.
Figure 4. Error Amplifier Configuration Diagram
8.3.4 Undervoltage Lockout
The UCx84xA devices feature undervoltage lockout protection circuits for controlled operation during power-up
and power-down sequences. Undervoltage lockout thresholds for the UCx842A, UCx843A, UCx844A, and
UCx845A devices are optimized for two groups of applications: off-line power supplies and DC-DC converters.
With a wider VCCON to VCCOFF range, the UCx842A and UCx844A devices are ideally suited to off-line AC input
applications. The UCx843A and UCx845A controllers have a much narrower VCCON to VCCOFF hysteresis and
may be used in DC to DC applications where the input is considered regulated.
During UVLO the IC draws typically 0.3 mA of supply current. This VCC current is considerable less than the
UCx84x family and results in lower power drawn from the line. The reduced start-up current is of particular
concern in off-line supplies where the IC is powered-up from the high-voltage DC rail, then bootstrapped to an
auxiliary winding on the main transformer. Power is then dissipated in the start-up resistor which is sized by the
IC’s start-up current. Lowering this by 50% in the UCx84xA version family, as compared to the UCx84x family,
reduces the resistors power loss by the same percentage. Once crossing the turnon threshold the IC supply
current increases typically to about 11 mA, During undervoltage lockout, the UCx84xA series of devices prevent
the power MOSFET from parasitically turning on due to the Miller effect at power-up. This improved design to the
lower totem-pole transistor’s operation during undervoltage lockout allows the IC to sink higher currents, up to 10
mA, at saturation voltages as low as 0.7 V, compared to the UCx84x devices which would only sink up to 0.2 mA
under the same conditions.


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