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| 型号： | CPC9909EB |
| 厂商： | IXYS Integrated Circuits Division |
| 文件页数： | 6/12页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR CPC9909 |
| 标准包装： | 1 |
| 电流 - 输出 / 通道： | 350mA |
| 输出及类型： | 1，非隔离 |
| 特点： | 可调光 |
| 输入电压： | 90 ~ 265VAC |
| 已供物品： | 板 |
| 已用 IC / 零件： | CPC9909 |
| 其它名称： | CLA351 |
I NTEGRATED C IRCUITS D IVISION
2. Functional Description
Figure 1 Typical Application Circuit
8 - 550 V
CPC9909
V DD
V DD
V IN
V oltage
CPC9909
D1
Reg u lator
One Shot
R T
V oltage
Reference
R T Minim u m Off-Time
TRIG
Q
Q1
L1
-
S
Q
GATE
+
LD
P W MD
-
+
R
CS
C V DD
R T
GND
R SENSE
B u ck Config u ration
2.1 Overview
The CPC9909 drives the LEDs via a minimum
off-time, peak-current-limited, pulse-frequency
modulation scheme. This control scheme is inherently
stable, and the driver can be operated above a 50%
duty cycle without any open-loop instability or
sub-harmonic oscillations. Since the switching
frequency depends on the LED load current, it results
in a high efficiency operation.
2.2 LED Driver Theory of Operation
When PWMD is high, the control circuit is enabled and
The peak current limit threshold is set by the external
sense resistor, R SE N SE , and the internal voltage
threshold, V CS(high) . This internal voltage threshold can
also be set externally via the LD pin. The lower of
these two thresholds and R SE N SE set the peak current
in the inductor.
A soft start function can be implemented by ramping
up the DC voltage at the LD pin from 0V to V CS(high) at
the desired rate. To utilize the soft start function,
connect a resistor divider from V DD to ground and a
capacitor from the LD pin to ground, as shown in
Figure 2 Soft-Start Circuit
the gate driver turns on the external power MOSFET
CPC9909
51k Ω
(Q1), causing the inductor (L1) current to ramp up until
the voltage across the current sense resistor (R SE N SE )
exceeds V CS(high) . When the voltage at the CS pin
exceeds this threshold, the gate driver turns Q1 off.
Q1 remains off for the duration of the fixed minimum
V IN
CS
GND
GATE
R T
LD
V DD
P W MD
2.2k Ω
0.1 μ F
off-time. While the switch is off, the inductor continues
to deliver the current to the load though the diode
(D1). When the off-time expires, Q1 turns on again
until the peak current limit is reached, and the process
repeats.
6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| CPC9909-EVAL | 功能描述:CPC9909 1, Non-Isolated Output LED Driver Evaluation Board 制造商:ixys integrated circuits division 系列:- 零件状态:有效 电流 - 输出/通道:350mA 输出和类型:1，非隔离 电压 - 输出:- 特性:可调光 电压 - 输入:90 ~ 265 VAC，15 V ~ 375 V 所含物品:板 使用的 IC/零件:CPC9909 标准包装:1 |
| CPC9909N | 功能描述:LED照明驱动器 8V-550V 2.5W 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 |
| CPC9909NE | 功能描述:LED照明驱动器 8V-550V 2.5W 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 |
| CPC9909NETR | 功能描述:LED照明驱动器 8V-550V 2.5W 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 |
| CPC9909NTR | 功能描述:LED照明驱动器 8V-550V 2.5W 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 |
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