UC2825AQDWREP datasheet(10/21 Pages) TI1

部件名	UC2825AQDWREP

功能描述	HIGH-SPEED PWM CONTROLLER

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制造商	TI1 [Texas Instruments]

网页	http://www.ti.com

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UDG−95108

VCC = OPEN

255C

–555C

Current – A

0

0.2

0.4

0.6

0.8

1.0

0

1

2

3

UDG−95106

250 mA

50 k

Q4

Q1

Q2

Q3

UVLO

OUT

PGND

VCC

UDG−95109

UDG−95110

ISWITCH

Current Mode

Voltage Mode

Oscillator

CT

1.25 V

Ramp

RSENSE

From E/A

CT

1.25 V

Ramp

From E/A

CT

UC2825A-EP

SGLS305D – JULY 2005 – REVISED SEPTEMBER 2010

www.ti.com

Active-Low Outputs During UVLO

The UVLO function forces the outputs to be low and considers both VCC and VREF before allowing the chip to

operate.

Figure 6. Output Voltage vs Output Current

Figure 7. Output V and I During UVLO

Control Methods

Figure 8. Control Methods

10

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Product Folder Link(s): UC2825A-EP

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