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ZXSC310
DEVICE DESCRIPTION
The ZXSC310 is PFM, controller IC which, when
combined with a high performance external transistor,
enables the production of a high efficiency boost
converter for LED driving applications. A block diagram
is shown for the ZXSC310 below.
The on chip comparator forces the driver circuit and
therefore the external switching transistor off if the
voltage at I SENSE exceeds 19mV. An internal reference
circuit and divider set this threshold.
The voltage at I SENSE is taken from a current sense
resistor connected in series with the emitter of the
switching transistor. A monostable following the
output of the comparator forces the turn-off time of the
output stage to be typically 1.7us. This ensures that
there is sufficient time to discharge the inductor coil
before the next on period.
V CC
With every on pulse the switching transistor is kept on
until the voltage across the current-sense resistor
exceeds the threshold of the I SENSE input. The on-pulse
length, and therefore the switching frequency, is
determined by the programmed peak current, the input
voltage and the input to output voltage differential. See
applications section for details.
The driver circuit supplies the external switching
transistor with a fixed drive current. To maximise
efficiency the external transistor switched quickly,
typically being forced off within 30ns.
V RE
I
2
R1
R2
Drive
I
S TDN
V DRIVE
I SENSE
G N D
ZXSC310 Block Diagram
ISSUE 3 - SEPTEMBER 2007
5
SEMICONDUCTORS
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相关代理商/技术参数
ZXSC380 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:Single or multi cell LED driver solution
ZXSC380FH 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:Single or multi cell LED driver solution
ZXSC380FHTA 功能描述:LED照明驱动器 Single or Multi Cell 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
ZXSC400 制造商:ZETEX 制造商全称:ZETEX 功能描述:LED DRIVER BOOST CONVERTER
ZXSC400_06 制造商:ZETEX 制造商全称:ZETEX 功能描述:Photoflash LED
ZXSC400E6 制造商:Diodes Incorporated 功能描述:IC LED DRIVER BOOST CONVERTER 400
ZXSC400E6 制造商:Diodes Incorporated 功能描述:IC LED DRIVER BOOST CONVERTER 400
ZXSC400E6TA 功能描述:LED照明驱动器 Reg Bst LED Drvr 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