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参数资料
| 型号： | A8514KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 38/42页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR WHT 4X80MA 16-ETSSOP |
| 标准包装： | 8,000 |
| 拓扑： | PWM，SEPIC，升压（升压） |
| 输出数： | 4 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载，背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 580kHz ~ 2MHz |
| 电源电压： | 5 V ~ 40 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽）裸露焊盘 |
| 供应商设备封装： | 20-TSSOP-EP |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 125°C |
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A8514
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
AC ground. Therefore, the transfer function of the compensation
tion to the pole at the origin. The pole at the origin is defined
–1 × I AMP × Z C (f)
V ERROR ×
circuit is derived as follows:
V C (f)
T EA (f ) =
V OUT (f)
=
applying equation A-20:
R S + R D
R S
(A-21)
(A-22)
by C P and R AMP . The zero is defined by R Z and C Z . The zero
frequency location is selected to compensate or cancel the power
train load pole. It is defined by:
f ZEA = 1 / (2 × π × R Z × C Z ) (A-26)
100
T EA (f ) = –1 ×
R S × g
R S +R D
× Z C (f )
(A-23)
50
where
×
Z C (f ) = (A-24)
+
R Z +
1 1
R Z + 2 × × f × j × C Z 2 × × f × j × C P
1 1
2 × × f × j × C Z 2 × × f × j × C P
Figure A-3 shows the logarithmic transfer function for the output
to control compensation circuit, with gain, G EA (f). given by:
0
50
10
100
1 × 10 3
Mid-Band Gain
1 × 10 4 1 × 10 5 1 × 10 6
Frequency (Hz)
1 × 10 7
1 × 10 8
G EA (f) = 20 × log( | T EA (f) | )
(A-25)
The transfer function has a single pair of pole and zero in addi-
Figure A-3. Plot of error amplifier stage transfer function versus frequency
L1
D1
VOUT
V IN
PWM
and
Driver
Q1
Current Sense
Amplifier
A2
COUT
D1
ESR
R I
Adder
Slope
Compensation
Transconductance
(g) Amplifier
D2
D10
Rz
Vc
A1
Cp
Ram p
Vreg
Rs
Cz
Figure A-2. Small signal model of a peak-current-mode boost converter;
the four strings of the A8514 are represented by one string in this example
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
A-3
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