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AN1126 数据表(PDF) 9 Page - STMicroelectronics

部件名 AN1126
功能描述  CURRENT SHARING OF THE L4973
PDF  16 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

AN1126 数据表(HTML) 9 Page - STMicroelectronics

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For
α equal to half period (180 degrees
of phase delay) the ripple current is ap-
proximately zero.
This allows to chose low cost output filtering
capacitor. Or, with the same ESR, to re-
duce drastically the output voltage ripple.
The phase shift between the two PWM sig-
nals can be easily achieved in two way.
If the duty cycle is far from 0.5, the ripple
current through the output capacitor is
higher in Case 2 than in Case 1 in which
the delay time can be programmed.
Current Sharing Evaluation Board for L4973D
α=0°
α=180°
α=120°
α=90°
α=40°
0
0
t
α=240°
+∆Ιο/2
−∆Ιο/2
Figure 14. Ripple current through the output
capacitor for different phase delay,
α.
Vcc
OUT
FB
U1
L4973D
Vcc (8V to 30V)
BOOT
GND
OSC
15nF
1.2nF
220nF
Vcc
COMP
GND
OUT
FB
BOOT
OSC
4.7nF
10K
D2
STPS
640CB
COMP
R9
R6
25m
Ω
220uF
SYNC
1uF
SS
22k
V5.1
1/2
LM358
SO8
U2
L4973D
V5.1
1uF
SS
SYNC
680uF
35V
220nF
25m
Ω
Rin=10K
4
8
Vcc
100nF
Iout=7A
L2 43uH
(77120) N=34
220uF
680uF
35V
220nF
15nF
D1
STPS
640CB
220nF
J2
220pF
INH2
INH
J3
INH1
INH
C8
C6
C2
C5
C7
C10
22nF
10K
220pF
C4
C9
R2
R3
R4
R1
R7*
10K
R5
R11
R8
C21
C19
C16
C15
C20
C17
C3
220nF
220nF
C23
C12
C1
C18
1
1
1
1
1
13
11
10
2,3
12
4,..,7
14,..,17
18
20
19
8,9
8,9
11
13
20
18 19
4,..,7
14,..,17
12
2,3
10
Cin=10nF
C14
5
6
+
7
-
C13
Z1*
L1 43uH
(77120) N=34
* Z1 and R1 are necessary only if Vcc>25V
Figure 15. Current sharing schematic diagram.
AN1126 APPLICATION NOTE
9/16



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