UCC28220, UCC28221
SLUS544A 鈭?SEPTEMBER 2003 鈭?REVISED AUGUST 2004
TYPICAL CHARACTERISTICS
UVLO THRESHOLDS
vs
TEMPERATURE
4.0
13.5
UCC28221 UVLO on threshold
VUVLO 鈭?UVLO Thresholds鈭?V
12.5
IDD 鈭?Quiescent Current 鈭?mA
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
鈭?0
鈭?5
0
25
50
75
100
125
0
2
4
6
8
10
12
14
16
QUIESCENT CURRENT
vs
SUPPLY VOLTAGE
UCC28221 EXCLUDES JFET CURRENT
11.5
9.5
UCC28220 and UCC28221 UVLO off threshold and
UCC28221 JFET on threshold (when switching)
8.5
7.5
Tj 鈭?Temperature 鈭?/div>
擄C
VDD 鈭?Supply Voltage 鈭?V
Figure 7
SUPPLY CURRENT
vs
SUPPLY VOLTAGE
30
20
IDD 鈭?Supply Current 鈭?mA
10
0
鈭?0
鈭?0
鈭?0
鈭?0
鈭?0
0
2
4
6
8
10
12
14
16
VDD 鈭?Supply Voltage 鈭?V
3.45
Figure 8
REFERENCE VOLTAGE
vs
TEMPERATURE
V
IN
= 36 V
UCC28221
VREF 鈭?ReferenceVoltage 鈭?V
3.40
3.35
3.30
No Load
3.25
Load
3.20
JFET source current
3.15
鈭?0
鈭?5
0
25
50
75
100
125
Tj 鈭?Temperature 鈭?/div>
擄C
Figure 9
Figure 10
UCC28220
UCC28221
17
10.5
UCC28220 UVLO on threshold and UCC28221
JFET on threshold (when not switching)
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