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參數(shù)資料
| 型號： | A8483EEKTR-T |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | 1.2 MHz Step-up Converter for Display Bias Supply |
| 中文描述： | 1.2 MHz的升壓轉換器，用于顯示偏壓電源 |
| 文件頁數(shù)： | 1/9頁 |
| 文件大?。?/td> | 328K |
| 代理商： | A8483EEKTR-T |
A8483-DS, Rev. 1
1.2 MHz Step-up Converter
for Display Bias Supply
A8483
Output voltage up to 35 V
2.5 to 10 V input
0.9 to 18 V input with separate bias supply
Delivers 15 V at 15 mA with 2.7 V input
Constant 1.2 MHz switching frequency provides low noise
350 mA switch current limit
1
μ
A shutdown current
Low-noise PWM/analog dimming
FEATURES
OLED bias supply / WLED backlight
Portable battery-powered equipment
Cellular phones
PDAs (Personal Digital Assistant)
Camcorders, personal stereos, MP3 players, cameras
Mobile GPS systems
APPLICATIONS
The A8483 is a current mode step-up dc-to-dc converter,
available in a 5-pin 3 mm × 3 mm thermally enhanced
MLP/TDFN lead (Pb) free package. Smaller external
components and integrated 36 V switch reduce component
count and footprint for a variety of applications.
A8483
VIN
V
SUPPLY
SW
EN
4
GND
2
FB
3
Li-ion
2.5 V to
5.5 V
C1
1 μF
L1
10 μH
1
5
D1
V
OUT
C2
1 μF
R2
39 k
Ω
R1
820 k
Ω
Enable
O
Figure 1.
OLED Bias Supply.
Use for cell phones, MP3
players, DSCs, and PDAs.
A8483
VIN
SW
EN
4
GND
2
FB
3
C1
1 μF
1
5
L1
10 μH
D1
D2
V
OUT1
+12 V
I
OUT1
+ I
OUT2
= 15 mA
V
OUT2
–12 V
C2
0.47 μF
C3
0.47 μF
C4
0.47 μF
R2
39 k
Ω
R1
732 k
Ω
Enable
Li-ion
2.5 Vto
5.5 V
V
SUPPLY
Figure 2.
Small LCD Bias Supply
. Li+ battery to ±12 V.
A8483
VIN
SW
EN
4
GND
2
FB
3
C1
1 μF
1
5
L1
10 μH
D1
V
OUT
C2
0.22 μF
Cf
0.01 μF
R2
5 k
Ω
Enable
R3
24 k
Ω
R1
47
Ω
Li-ion
2.5 V to
5.5 V
V
C
Analog Voltage or
PWM
V
SUPPLY
A8483
VIN
SW
EN
4
GND
2
FB
3
C1
1 μF
1
5
L1
10 μH
D1
V
OUT
C2
1 μF
R2
47 k
Ω
R1
560 k
Ω
Enable
R3
160 k
Ω
Cf
1 nF
Cf for PWM dimming only
O
Analog Voltage or
PWM 10 kHz
V
SUPPLY
Li-ion
2.5 V to
5.5 V
Figure 6.
OLED Bias Supply.
Use for low-noise PWM
dimming, or with analog voltage through the FB pin.
A8483
SW
EN
4
GND
2
VIN
5
FB
3
C1
1 μF
L1
10 μH
1
D1
5 V
V
OUT
C2
1 μF / 50 V
R2
15 k
Ω
R1
768 k
Ω
for
V
OUT
=
32 V
604 k
Ω
for
V
OUT
=
25 V
Enable
32 V, 18 mA
25 V, 25 mA
V
SUPPLY
Figure 3.
LCD TV, Plasma TV Bias, FED Display,
Varactor Diode Bias.
Using 5 V input.
A8483
VIN
SW
EN
4
GND
2
FB
3
7.5 V
V
Z
C1
1 μF
C3
0.1 μF
L1
22 μH
1
5
D1
12 V
V
OUT
C2
1 μF / 50 V
R2
15 k
Ω
R1
768 k
Ω
for
V
OUT
=
32 V
604 k
Ω
for
V
OUT
=
25 V
Enable
32 V, 40 mA
25 V, 80 mA
Connect either V
Z
or V
BIAS
V
SUPPLY
5 V
V
BIAS
Figure 4.
LCD TV, Plasma TV Bias, FED Display,
Varactor Diode Bias.
Using 12 V input.
Figure 5.
WLED Backlighting
.
Approximate Scale 1:1
Package EK:
MLP/TDFN, 3 × 3 mm
0.75 mm Nominal Height
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