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| 型号： | ZXLD1370EST16TC |
| 厂商： | Diodes Inc |
| 文件页数： | 15/39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： | 是 |
| 拓扑： | PWM，降压（降压），升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 无 |
| 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 |
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A Product Line of
Diodes Incorporated
ZXLD1370
Application Information (cont.)
b) Boost and Buck-Boost modes – the most simple boost/buck-boost circuit is shown in Figure 23
Control in Boost and Buck-boost mode is achieved by sensing the coil
current in the series resistor Rs, connected between the two inputs of a
current monitor within the control loop block. An output from the control loop
drives the input of a comparator which drives the gate of the external NMOS
switch transistor Q1 via the internal Gate Driver. When the switch is on, the
drain voltage of Q1 is near zero. Current flows from VIN, via Rs, coil and
switch to ground. This current ramps up until an upper threshold value is
reached (see Figure 24 ). At this point GATE goes low, the switch is turned
off and the drain voltage increases to either:
1)
the load voltage VLEDS plus the forward voltage of D1 in Boost
configuration,
or
2)
the load voltage VLEDS plus the forward voltage of D1 plus VIN in
Buck-boost configuration.
Current flows via Rs, coil, D1 and LED back to VIN (Buck-boost mode), or
GND (Boost mode). When the coil current has ramped down to a lower
threshold value, GATE goes high, the switch is turned on again and the
cycle of events repeats, resulting in continuous oscillation. The feeback
loop adjusts the NMOS switch duty cycle to stabilize the LED current in
response to changes in external conditions, including input voltage and load
voltage. Loop compensation is achieved by a single external capacitor C2,
connected between SHP and SGND. Note that in reality, a load capacitor
C OUT is used, so that the LED current waveform shown is smoothed.
The average current in the sense resistor and coil, I RS , is equal to the
average of the maximum and minimum threshold currents and the ripple
current (hysteresis) is equal to the difference between the thresholds.
The average current in the LED, I LED , is always less than I RS . The feedback
control loop adjusts the switch duty cycle, D, to achieve a set point at the
sense resistor. This controls I RS . During the interval t OFF , the coil current
Figure 23 Boost and Buck-Boost Configuration
flows through D1 and the LED load.
During t ON , the coil current flows
through Q1, not the LEDs. Therefore the set point is modified by D using a
gating function to control I LED indirectly. In order to compensate internally
for the effect of the gating function, a control factor, GI_ADJ is used.
GI_ADJ is set by a pair of external resistors, R GI1 and R GI2 . ( Figure 23. )
This allows the sense voltage to be adjusted to an optimum level for power
efficiency without significant error in the LED controlled current.
GI _ ADJ = ?
?
?
?
RGI 1 ?
RGI 1 + RGI 2 ?
? 0 . 225 ? ? GI _ ADJ ? ? V ADJ ?
R S = ? ?
? ? ?
? ? ?
1 ? D
? ? V REF ?
? R S ? ?
Equation 2 (Boost and Buck-boost modes)
The control loop sets the duty cycle so that the sense resistor current is
? ?
Equation 3 (Boost and Buck-boost modes)
I RS equals the coil current. The coil is connected only to the switch and the
schottky diode. The schottky diode passes the LED current.
Figure 24 Operating Waveforms
(Boost and Buck-boost modes)
ZXLD1370
Document number: DS32165 Rev. 5 - 2
15 of 39
www.diodes.com
September 2012
? Diodes Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ZXLD1371 | 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:60V HIGH ACCURACY BUCK/BOOST/BUCK-BOOST LED DRIVER-CONTROLLER |
| ZXLD1371EST16TC | 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 |
| 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 |
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