UCC28910_15 datasheet(6/53 Pages) TI

Part #	UCC28910

Description	High-Voltage Flyback Switcher with Primary-Side Regulation and Output Current Control

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Manufacturer	TI [Texas Instruments]

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CSTE(max)

D _ PK(max)

IPK

V

I

R

UCC28910

UCC28911

SLUS769C – JULY 2013 – REVISED MARCH 2015

www.ti.com

Detailed Pin Description (continued)

7.1.4 IPK (Set the Maximum DRAIN Current Peak)

A resistance (RIPK) connected between IPK pin and GND sets the maximum value of the power FET peak

current, ID_PK(max). A current, ISENSE, proportional to the power FET current, comes out from the IPK pin during

power FET on time. The voltage across RIPK is fed to the PWM comparator and establish to switch off the power

FET according to the following equation:

where

•

VCSTE(max) is the equivalent current sense threshold (see Electrical Characteristics table).

(3)

If the IPK pin is shorted to GND (RIPK = 0), the peak current is automatically set to ID_PEAK(max), 600 mA for

UCC28910, or 700 mA for UCC28911.

A test is performed at device start up to check whether the IPK pin is shorted to GND or the RIPK is present. If

RIPK is less than RIPK_SHORT (maximum), the device interprets it as a short (RIPK = 0) and the DRAIN peak current

is set to ID_PEAK(max). Otherwise, if RIPK is greater than RIPK(min) (minimum), the device sets the peak current

DRAIN according to the previous equation. A value of RIPK that is in between the before said values is not

allowed since the value of the peak current may be selected using either of the two sense resistances: the

internal sense resistance and RIPK.

7.1.5 DRAIN

The DRAIN pin is connected to the DRAIN of the internal power FET. This pin also provides current to the high

voltage current source at start up.

6

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