ꢀ ꢁꢁꢂ ꢃ ꢄ ꢅ ꢆ ꢀ ꢁꢁ ꢂ ꢃꢄ ꢃ ꢆ ꢀꢁ ꢁꢇ ꢃ ꢄ ꢅ ꢆ ꢀꢁ ꢁꢇ ꢃ ꢄ ꢃ
ꢈ ꢉꢁꢊ ꢋꢌ ꢍꢋꢎ ꢏꢐ ꢑꢒꢁ ꢓꢋ ꢐ ꢍ ꢐꢏ ꢐꢏ ꢔꢀ ꢕꢒꢓꢋ ꢐ
ꢖ
SLUS395J - FEBRUARY 2000 - REVISED MARCH 2009
APPLICATION INFORMATION
capacitor ripple reduction (continued)
Gate Drive
From Down
Stream PWM
C1
D1
UCC3817
CT
D2
C
T
R
T
RT
Figure 7. Synchronizing the UCC3817 to a Down-Stream Converter
REFERENCE VOLTAGE
vs
REFERENCE CURRENT
REFERENCE VOLTAGE
vs
SUPPLY VOLTAGE
7.60
7.55
7.50
7.45
7.40
7.510
7.505
7.500
7.495
7.490
0
5
I
10
15
20
25
9
10
11
12
13
14
− Reference Current − mA
VCC − Supply Voltage − V
VREF
Figure 8
Figure 9
16
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