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| 型号： | A8483EEKTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 7/10页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 0.35A 5MLP |
| 标准包装： | 1 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 35V |
| 输入电压： | 2.5 V ~ 10 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.2MHz |
| 电流 - 输出： | 350mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 5-WDFN 裸露焊盘 |
| 包装： | 剪切带 (CT) |
| 供应商设备封装： | 5-MLP/TDFN（3x3） |
| 其它名称： | 620-1101-1 |
A8483
1.2 MHz Step-up Converter
for Display Bias Supply
increase gradually. When the voltage drop across R3 is reduced
to less than about 0.8 V, the feedback from the sense resistor, R1,
takes over full control of the output voltage.
The length of the soft start delay depends on the combined effect
of R2, R3, R4, C3 and the amplitude of the EN signal. The delay
can be adjusted by the selection of these values.
V SUPPLY
Li-ion
2.5 V to
5.5 V
C1
1 μF
5
VIN
EN
4
L1
10 μH
A8483
GND
2
1
SW
FB
3
D1
V OUT
D2
R1
820 k Ω
C2
1 μF
Enable
Component Selection
R4
47 k Ω
C3
10 nF
R3
24 k Ω
R2
39 k Ω
The component values shown in figure 1 are sufficient for most
applications. To reduce output ripple, the value of the output
inductor, L1, may be increased, but in most cases this results in
excessive board area and additional cost.
Inductor Selection (L1). With an internal PWM frequency of
1.2 MHz, the optimum inductor value for most cases would be
10 μ H. The inductor should have low winding resistance, typi-
cally < 1 ? , and the core should have low losses at 1.2 MHz.
For worst-case conditions of high output voltage and current, and
low input voltage, the inductor should be rated at the switch cur-
rent limit of 350 mA.
If high temperature operation is required, derating should be
considered. In some cases where lower inductor currents are
expected, the current rating can be decreased.
Figure 14. OLED Soft Start Circuit
EN
V OUT
I IN
Figure 15. OLED Soft Start Circuit. Performance of circuit shown in figure 14.
Several inductor manufacturers, including Coilcraft, Murata,
Panasonic, Sumida, Taiyo Yuden, and TDK, have and are devel-
oping suitably small-size inductors. Two recommended inductors
are:
V SUPPLY
C1
1 μF
5
VIN
L1
22 μH
A8483
1
SW
D1
V OUT
? TDK: NLCV32T-100K-PF, 10 μ H
Li-ion
2.5 V to
EN
4
GND
2
FB
3
R2
5 k Ω
C2
0.22 μF
? Toko: 1098AS-100M, 10 μ H
Diode Selection (D1). The diode should have a low forward volt-
5.5 V
Enable
R4
47 k Ω
C3
0.01 μF
D2
R3
24 k Ω
R1
4.75 Ω
age to reduce conduction losses, and a low capacitance to reduce
switching losses. Schottky diodes can provide both these features
if carefully selected. The forward voltage drop is a natural advan-
tage for Schottky diodes, and it reduces as the current rating of
the component increases.
However, as the current rating increases, the diode capacitance
also increases, so the optimum selection is usually the lowest
current rating above the circuit maximum. In this application, an
average current rating of 100 to 200 mA is usually sufficient.
Capacitor Selection. Because the values recommended for the
capacitors are low, ceramic capacitors are the best choice for this
application. To reduce performance variation over temperature
changes, low drift types such as X7R and X5R should be used.
Figure 16. WLED Soft Start Circuit
C1. A 1.0 μ F capacitor on the VIN pin is suitable for most appli-
cations. In cases where large inductor currents are switched, a
larger capacitor may be needed.
C2. The output capacitor can be as small as 0.22 μ F for most
applications and most V IN / V OUT combinations. Increasing this
capacitor value aids in reducing ripple and increasing efficiency
in low input voltage / high output voltage conditions.
Suitable capacitors are available from: TDK, Taiyo Yuden,
Murata, Kemet, and AVX.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
6
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