Datasheet

 
SLUS544E − SEPTEMBER 2003 − REVISED MARCH 2009
17
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TYPICAL CHARACTERISTICS
Figure 7
UVLO THRESHOLDS
vs
TEMPERATURE
−50 −25 0 25 50 75 100 12
5
7.5
8.5
9.5
10.5
11.5
12.5
13.5
V
UVLO
− UVLO Thresholds− V
Tj − Temperature − °C
UCC28221 UVLO on threshold
UCC28220 UVLO on threshold and UCC28221
JFET on threshold (when not switching)
UCC28220 and UCC28221 UVLO off threshold and
UCC28221 JFET on threshold (when switching)
Figure 8
QUIESCENT CURRENT
vs
SUPPLY VOLTAGE
I
DD
− Quiescent Current − mA
02468101214
0.0
0.5
1.0
1.5
2.0
2.5
3.0
16
3.5
4.0
V
DD
− Supply Voltage − V
UCC28221 EXCLUDES JFET CURRENT
UCC28220
UCC28221
Figure 9
SUPPLY CURRENT
vs
SUPPLY VOLTAGE
02468101214
−50
−40
−30
−20
−10
0
10
16
20
30
I
DD
− Supply Current − mA
V
DD
− Supply Voltage − V
UCC28221
V
IN
= 36 V
JFET source current
Figure 10
REFERENCE VOLTAGE
vs
TEMPERATURE
VREF − ReferenceVoltage − V
−50 −25 0 25 50 75 100
3.15
3.20
3.25
3.30
3.35
3.40
3.45
12
5
Tj − Temperature − °C
No Load
Load