A8425 データシートの表示（PDF） - Allegro MicroSystems
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コンポーネント説明
メーカー
A8425
Allegro MicroSystems
A8425 Datasheet PDF : 16 Pages
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A8425
High Current Photoflash Capacitor Charger
with IGBT Driver for Two Li+ Batteries
Performance Characteristics
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
3
Charge Time versus Battery Voltage
Transformer Lp= 7 μH, N = 10; TLIM = Low;
VIN = 3.6 V; COUT= 100 μF / 330 V UCC; TA=25°
RSET
(kΩ)
58
45
36.5
30
25
IP
(A)
≈ 1.4
≈ 1.8
≈ 2.2
≈ 2.6
≈ 3.2
4
5
6
7
8
9
10
11
VBAT (V)
COUT= 100 μF. For larger or smaller capacitances, charging time
scales proportionally.
79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
1
Efficiency versus Battery Voltage
Transformer LP= 7.3 μH; VIN= 3 V; COUT= 100 μF UCC; TA=25°
RSET
(kΩ)
58
45
36.5
30
25
IP
(A)
≈ 1.4
≈ 1.8
≈ 2.2
≈ 2.6
≈ 3.2
2
3
4
5
6
7
8
9
10 11
VBAT (V)
This data was obtained using a TDK DCT9.5/5ERUxxS003 transformer
(LP = 7.6 μH, 3.2 A, N = 10). Highest efficiency is achieved at high bat-
tery voltage and large peak current (1.4 to 1.8 A). At a maximum peak
current of 3.2 A, conduction losses from the MOSFET and from the
transformer windings dominate, so efficiency suffers.
Average Input Current versus Battery Voltage
Transformer Lp= 7 μH, N = 10, TLIM = Low
VIN = 3.6 V, COUT= 100 μF 330 V UCC, TA= 25°
1.50
1.40
1.30
1.20
1.10
1.00
0.90
0.80
0.70
0.60
0.50
0.40
0.30
3 4 5 6 7 8 9 10 11
VBAT (V)
The average input current decreases with higher VBAT. .
RSET
(kΩ)
25
30
36.5
45
58
IP
(A)
≈ 3.2
≈ 2.6
≈ 2.2
≈ 1.8
≈ 1.4
Allegro MicroSystems, Inc.
8
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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