Diodes AUR9717 - Manual (Page 12)

Data Sheet
Dual 1A, 1.5MHz PWM Step-down DC-DC Converter with OVP AUR9717
Oct. 2011 Rev. 1.0 BCD Semiconductor Manufacturing Limited
12
Typical Application
V
IN
= 2.5V to 5.5V
C
IN2
4.7µF
R1
R2
C
OUT 1
10µF
L1 2.2µH
C1
V
OUT 1
AU
R
9
7
1
7
GND
FB 1
LX1 EN1
VIN2
LX2 EN2
GND
FB2
VIN1
1 10
9
8
7 4
5 6
2
3 Connected
to V
IN
C
IN1
4.7µF
R3
R4
C
OUT2
10µF
L 2 2.2µH
C2
V
OUT2
I
R2
I
R4
Note 3: ) 1 (
2
1
FB1 1
R
R
V V
OUT
+ × =
; ) 1 (
4
3
FB2 2
R
R
V V
OUT
+ × =
When R2 or R4=300k Ω to 60kΩ, the I
R2
or I
R4
=2 μA to 10μA , and R1×C1 or R3×C2 should be in the range between
3×10 -6 and 6×10 -6 for component selection.
.
Figure 18. Typical Application Circuit of AUR9717 (Note 3)
Table 1. Component Guide
V
OUT1
or V
OUT2
(V)
R1 or R3
(k
Ω)
R2 or R4
(k
Ω)
C1 or C2
(pF)
L1 or L2
(
μH)
3.3 453 100 13 2.2
2.5 320 100 18 2.2
1.8 200 100 30 2.2
1.2 100 100 56 2.2
1.0 68 100 82 2.2