- 您现在的位置：买卖IC网 > Sheet目录995 > NCL30051LEDGEVB (ON Semiconductor)BOARD EVAL NCL30051 LED DRIVER
NCL30051
DETAILED OPERATING DESCRIPTION
AC Input
EMI
Filter
LBST
DBST
Cbulk
QBST
Vbulk
QH
LR
T1
DR1
Cout
Vout
QL
VREF
DR2
6
12
7
1
4
9
3
11
PCS PFB
PDRV VCC
PZCD HBoost
HV HDRVhi
VREF HVS
PCT HDRVlo
GND PControl
PGND OSC
5
10
16
15
14
13
8
2
VCC
VDD
VDD
Z
2.5 V
Z
2.5 V
Secondary Side
Compensation
(CCCV)
Figure 2. Simplified Application Block Diagram
Logic
PWM
OVERVIEW
The NCL30051 is a combination of a PFC boost
controller and a half ? bridge resonant controller optimized
for off-line LED lighting solutions. This device integrates
all the features needed to implement a highly efficient and
small form factor LED driver. It contains a critical
conduction mode (CrM) power factor correction (PFC)
controller and a half ? bridge resonant (HBR) controller
with a built ? in 600 V driver. The half ? bridge stage operates
at a fixed frequency ? greatly simplifying the control
implementation. Output (current or voltage) regulation can
be achieved by adjusting the PFC stage output voltage
based on a control signal generated external to the
NCL30051.
This device includes an enable input on the PFC
feedback pin, open feedback loop protection and PFC
overvoltage and undervoltage detectors. Other features
included in the NCL30051 are a 600 V startup circuit and
an adjustable frequency oscillator. The controllers are
properly sequenced, simplifying the system design.
THEORY OF OPERATION
The NCL30051 provides an innovative control
mechanism compared to traditional two stage power
conversion architectures. This unique regulation scheme
offers extreme simplicity for certain applications, but at the
same time places constraints that have to be taken into
account during the converter design .
Traditional 2-stage converters have independent control
loops for the PFC stage and the step-down stage, allowing
each converter output to be regulated on its own. The PFC
stage is often designed for critical conduction (CrM) or
continuous conduction mode (CCM) operation and the
step-down stage is typically a current-mode/voltage-mode
PWM controller geared for forward or flyback
applications. More recently, some solutions such as the
NCP1910 CCM PFC two stage combo from ON
Semiconductor have become available which incorporates
the half-bridge resonant converter topology which offers
significant efficiency and EMI advantages. However, this
HBR topology involves varying the switching frequency to
regulate the output and hence adds further complexity to
such combination controllers.
In contrast, the NCL30051 simplifies the overall
approach significantly by implementing the HBR approach
for the second stage converter at a fixed frequency. This
simply means that the second-stage converter now operates
in a non-regulating fixed-ratio voltage conversion mode.
The implication of this approach is that output regulation
control has to be provided by adjusting the output of the
PFC front-end converter. The benefits of this approach can
be summarized as follows:
http://onsemi.com
8
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
NCL30100ASLDGEVB
BOARD DEMO SGL LAYER PWM DIM LED
NCL30105GEVB
BOARD EVAL 80V 350 FOR LED DRV
NCP1013LEDGEVB
BOARD EVAL 5W UNIV LED DRIVER
NCP1028LEDGEVB
EVAL BOARD FOR NCP1028LEDG
NCP1216AFORWGEVB
BOARD EVAL NCP1216A 35W
NCP1351LEDGEVB
EVAL BOARD FOR NCP1351LEDG
NCP3065BBGEVB
BOARD EVAL NCP3065 MR16 BOOST
NCP3066SCBCKGEVB
EVAL BOARD FOR NCP3066SCBCKG
相关代理商/技术参数
NCL30080
制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Quasi-Resonant Primary Side Current-Mode Side Current-Mode
NCL30080_13
制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Quasi-Resonant Primary Side Current-Mode Controller for LED Lighting
NCL30080A
制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Quasi-Resonant Primary Side Current-Mode Controller for LED Lighting
NCL30080ASNT1G
功能描述:LED照明驱动器 Quasi-Res I-Mode Cntlr
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
NCL30080B
制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Quasi-Resonant Primary Side Current-Mode Controller for LED Lighting
NCL30080BSNT1G
制造商:ON Semiconductor 功能描述:PRIMARY SIDE CC FOR LED L - Tape and Reel
NCL30081
制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Dimmable Quasi-Resonant Primary Side Current-Mode Controller for LED Lighting
NCL30081_13
制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Dimmable Quasi-Resonant Primary Side Current-Mode Controller for LED Lighting