参数资料
型号: ZXLD1370EST16TC
厂商: Diodes Inc
文件页数: 32/39页
文件大小: 0K
描述: IC LED DRVR HIGH BRIGHT TSSOP-16
特色产品: ZXLD1370 High Accuracy LED Driver
标准包装: 1
恒定电流:
拓扑: PWM,降压(降压),升压(升压)
输出数: 1
内部驱动器:
类型 - 主要: 车载,通用
类型 - 次要: 高亮度 LED(HBLED)
频率: 300kHz ~ 1MHz
电源电压: 6 V ~ 60 V
安装类型: 表面贴装
封装/外壳: 16-TSSOP(0.173",4.40mm)裸露焊盘
供应商设备封装: 16-TSSOP-EP
包装: 标准包装
工作温度: -40°C ~ 125°C
产品目录页面: 1478 (CN2011-ZH PDF)
其它名称: ZXLD1370EST16TCDKR
A Product Line of
Diodes Incorporated
ZXLD1370
Application Information (cont.)
Over-Voltage Protection
The ZXLD1370 is inherently protected against open-circuit load when used in Buck configuration. However care has to be taken with open-
circuit load conditions in Buck-Boost or Boost configurations. This is because in these configurations there is no internal open-circuit protection
mechanism for the external MOSFET. In this case an Over-Voltage-Protection (OVP) network should be provided externally to the MOSFET to
avoid damage due to open circuit conditions. This is shown in figure 38 below, highlighted in the dotted blue box.
Figure 38 OVP circuit
The zener voltage is determined according to: Vz = V LEDMAX +10% where V LEDMAX is maximum LED chain voltage.
If the LEDA voltage exceeds V Z the gate of MOSFET Q2 will rise turning Q2 on. This will pull the PWM pin low and switch off Q1 until the voltage
on the drain of Q1 falls below V Z . If the voltage at LEDA remains above V Z for longer than 20ms then the ZXLD1370 will enter into a shutdown
state.
Care should be taken such that the maximum gate voltage of the Q2 MOSFET is not exceeded.
Take care of the max voltage drop on the Q2 MOSFET gate.
ZXLD1370
Document number: DS32165 Rev. 5 - 2
32 of 39
www.diodes.com
September 2012
? Diodes Incorporated
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ZXLD1374_11 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:60V HIGH ACCURACY 1.5A BUCK/BOOST/BUCK-BOOST