Datasheet

UDG−95108
V
CC
= OPEN
255C
–555C
Current – A
0 0.2 0.4 0.6 0.8 1.0
0
1
2
3
V
OUT
– V
UDG−95106
250 mA
50 k
Q4
Q1
Q2
Q3
UVLO
OUT
P
GND
V
CC
UDG−95109
UDG−95110
I
SWITCH
Current Mode Voltage Mode
Oscillator
Oscillator
C
T
C
T
1.25 V
Ramp
R
SENSE
From E/A
C
T
1.25 V
Ramp
From E/A
C
T
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
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