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参数资料
| 型号： | ZXLD1371EST16TC |
| 厂商： | Diodes Inc |
| 文件页数： | 34/42页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER |
| 特色产品： | ZXLD1371 LED Driver Controller |
| 标准包装： | 1 |
| 系列： | * |
| 其它名称： | ZXLD1371EST16TCDIDKR |
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A Product Line of
Diodes Incorporated
ZXLD1371
Applications Information (cont.)
LED current can be adjusted digitally, by applying a low
frequency PWM logic signal to the PWM pin to turn the
Gate
2μs
< 10 ms
controller on and off. This will produce an average output
current proportional to the duty cycle of the control signal.
During PWM operation, the device remains powered up
and only the output switch is gated by the control signal.
The PWM signal can achieve very high LED current
resolution. In fact, dimming down from 100% to 0, a
minimum pulse width of 2μs can be achieved resulting in
very high accuracy. While the maximum recommended
0V
PWM
pulse is for the PWM signal is10ms.
< 10 ms
0V
2μs
Figure 12. PWM Dimming Minimum and
Maximum Pulse
The device can be put in standby by taking the PWM pin to ground, or pulling it to a voltage below 0.4V with a suitable open
collector NPN or open drain NMOS transistor, for a time exceeding 15ms (nominal). In the shutdown state, most of the
circuitry inside the device is switched off and residual quiescent current will be typically 90μA. In particular, the Status pin
will go down to GND while the FLAG and REF pins will stay at their nominal values.
Figure 13. Stand-by State From PWM Signal
Thermal Control of LED Current
For thermal control of the LEDs, the ZXLD1371 monitors the voltage on the TADJ pin and reduces output current if the
voltage on this pin falls below 625mV. An external NTC thermistor and resistor can therefore be connected as shown below
to set the voltage on the TADJ pin to 625mV at the required temperature threshold. This will give 100% LED current below
the threshold temperature and a falling current above it as shown in the graph. The temperature threshold can be altered by
adjusting the value of Rth and/or the thermistor to suit the requirements of the chosen LED.
The Thermal Control feature can be disabled by connecting TADJ directly to REF.
Here is a simple procedure to design the thermal feedback circuit:
1)
2)
3)
Select the temperature threshold T threshold at which the current must start to decrease
Select the Thermistor TH1 (both resistive value at 25 ? C and beta)
Select the value of the resistor R th as R th = TH at T threshold
ZXLD1371
Document number: DS35436 Rev. 1 - 2
34 of 42
www.diodes.com
February 2012
? Diodes Incorporated
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| ZXLD1371QESTTC | 功能描述:MOSFET LED Controller TSSOP TSSOP-16EP T&R 2.5K RoHS:否 制造商:STMicroelectronics 晶体管极性:N-Channel 汲极/源极击穿电压:650 V 闸/源击穿电压:25 V 漏极连续电流:130 A 电阻汲极/源极 RDS（导通）:0.014 Ohms 配置:Single 最大工作温度: 安装风格:Through Hole 封装 / 箱体:Max247 封装:Tube |
| ZXLD1374 | 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:60V HIGH ACCURACY 1.5A BUCK/BOOST/BUCK-BOOST |
| 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 |
| ZXLD1374EST20TC | 功能描述:LED照明驱动器 60V 1.5A BUCK/BOOST LED DRIVER AEC-Q100 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 |
| ZXLD1601 | 制造商:ZETEX 制造商全称:ZETEX 功能描述:ADJUSTABLE DC - DC BOOST CONVERTER WITH INTERNAL SWITCH IN SC70 |
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