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Integrated High-Voltage LED Driver
with Analog and PWM Dimming Control
L1
L2
C H_REG
D OUT
C S
VOUT
R CS
V IN
V IN
LV
SRC
R SRC
C OUT
IN
GT
C IN1
RT
C L_REG
EN
RT
L_REG
MAX16812
DRV
SLP
R G
C SLP
R TGRM
TGRM
C TGRM
VOUT
DIM
COMP
R OV1
R OV2
R REF2
R REF1
R COMP1
R COMP2
C COMP2
C COMP1
Figure 15. SEPIC Configuration
Output Capacitor
The function of the output capacitor is to reduce the
In a buck-boost configuration, the output capacitance,
C OUT is:
output ripple to acceptable levels. The ESR, ESL, and
the bulk capacitance of the output capacitor contribute
to the output ripple. In most of the applications, the out-
put ESR and ESL effects can be dramatically reduced
C OUT ≥
2 × V OUT × I OUT
Δ V R × ( V OUT + V INMIN ) × f SW
by using low-ESR ceramic capacitors. To reduce the
ESL effects, connect multiple ceramic capacitors in
parallel to achieve the required capacitance.
In a buck configuration, the output capacitance, C OUT ,
is calculated using the following equation:
( V INMAX ? V OUT ) × V OUT
C OUT ≥
Δ V R × 2 × L × V INMAX × f SW 2
where Δ V R is the maximum allowable output ripple.
where V OUT is the voltage across the load and I OUT is
the output current.
Input Capacitor
An input capacitor connected between IN and ground
must be used when configuring the MAX16812 as a
buck converter. Use a low-ESR input capacitor that can
handle the maximum input RMS ripple current.
Calculate the maximum RMS ripple using the following
equation:
In a boost configuration, the output capacitance, C OUT ,
is calculated as:
I IN(RMS) =
I OUT ×
V OUT × ( V INMIN - V OUT )
V INMIN
C OUT ≥
( V OUT ? V INMIN ) × 2 × I OUT
Δ V R × V OUT × f SW
When using the MAX16812 in a boost or buck-boost
configuration, the input capacitor’s RMS current is low
and the input capacitance can be small. However, an
where C OUT is the output capacitor.
additional electrolytic capacitor may be required to pre-
vent oscillations due to line impedances.
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MAX16812ATI/V+T 功能描述:LED照明驱动器 w/Analog & PWM Dimming Control RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
MAX16812ATI+ 功能描述:LED照明驱动器 w/Analog & PWM Dimming Control RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
MAX16812ATI+T 功能描述:LED照明驱动器 w/Analog & PWM Dimming Control RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
MAX16812EVKIT+ 功能描述:LED 照明开发工具 Evaluation Kit for the MAX16812 RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装:
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MAX16813ATP+T 功能描述:LED照明驱动器 Integrated 4Ch HB LED Driver RoHS:否 制造商:Maxim Integrated 输入电压: 工作频率: 最大电源电流: 输出电流: 最大工作温度: 安装风格: 封装 / 箱体: