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参数资料
| 型号： | A8514KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 37/42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
? R EQ is the output nominal operating resistance, which is given
by the following equation:
R EQ = V OUT / I LEDT (A-7)
ω Z , angular frequency of the output capacitor
ESR zero, f Z
ω Z = 1 / (ESR × C OUT )
(A-15)
where I LEDT is the total output current through all LED
strings:
I LEDT = N S × I LED
and N S is the total quantity of LED strings, and
(A-8)
ω RHP , angular frequency of the right-half plane
zero, f RHP
ω RHP = R EQ / (1 – D(max)) 2 × L 1 )
where
(A-16)
? R D is the total dynamic resistance of an LED string, which
can be taken from the datasheets of the LEDs being used, or
measured in the lab, as follows:
D (max) = ( V OUT – V IN (min)) / V OUT
ω P , angular frequency of the output load pole, f P
(A-17)
1. Apply a voltage, V 1 , from one end of an LED string to the
other end.
ω P =
R S + R D + R EQ
( R S + R D + ESR) × R EQ × C OUT
(A-18)
2. Measure the current, I 1 , through the string.
3. Repeat for another voltage, V 2 , and measure the current, I 2 .
4. Calculate the result as:
R D = ( V 2 – V 1 ) / ( I 2 – I 1 ) (A-9)
Q D , inductor peak current sampling double pole quality
ω S , angular frequency oscillation of the double pole that
occurs at half of the switching frequency, f SW
ω S = π × f SW (A-19)
Output to Control Transfer Function
Q D =
where
1
× [0.5 – D (nom) + ( 1 – D (nom)) × IFSC]
(A-10)
When using peak current mode control for a DC-to-DC converter,
a type II PI error amplifier compensation circuit is sufficient to
stabilize the converter. For controlling the current sink voltage
and as a result controlling the output, the A8514 IC uses a high
? I × FSC × 10 –6
IFSC is the implemented factor of inductor slope compensation,
and is given by:
IFSC = ( ISC / CSC ) × FSC (A-11)
and
ISC is the IC implemented slope compensation in A/ μ s, which
can be taken from the IC datasheet, and
CSC is the calculated slope compensation also in A/ μ s,
given by:
CSC = (A-12)
(1/ f SW )× (1– D (max))
and
Δ I = ( V IN (min) × D (max)) / L 1 × f SW , and (A-13)
FSC is the Ridley’s factor slope compensation, given by:
bandwidth transconductance amplifier, shown as A1 in fig-
ure A-2.
A transconductance amplifier is actually a voltage-controlled
current source. It converts any error voltage at its input pins to a
current flowing out of its output pin at V C . The transconductance
gain of the error amplifier, g , is defined as:
g = I AMP / V error (A-20)
In figure A-2, R AMP represents the output impedance of the
transconductance amplifier (A1). R AMP usually has a high value
and it is neglected in the calculation of the error amplifier transfer
function.
R Z , C Z , and C P represent the external Type II compensation net-
work. From an AC point of view, the non-inverting pin of A1 is
FSC = 1 – 0.18 / D (max)
(A-14)
connected to a DC reference voltage, V REG , which is a virtual
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
A-2
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