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参数资料
| 型号： | SSL21082T/1,118 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 10/23页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER 300V 12-SOIC |
| 标准包装： | 1 |
| 系列： | GreenChip™ |
| 拓扑： | PWM，降压（降压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光，通用 |
| 频率： | 25kHz ~ 200kHz |
| 电源电压： | 8 V ~ 14 V |
| 输出电压： | 300V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-SOIC（0.154"，3.90mm 宽）12 引线 |
| 供应商设备封装： | 12-SO |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 125°C |
| 其它名称： | 568-9563-6 |
NXP Semiconductors
SSL21081T/2T/3T/4T
GreenChip drivers for LED lighting
8.8 NTC functionality and PWM dimming
The NTC pin can be used as a control method for LED thermal protection. Alternatively,
the pin can be used as an input to disable/enable light output using a digital signal (PWM
dimming). The pin has an internal current source that generates the current of I offset(NTC) .
An NTC resistor to monitor the LED temperature can be directly connected to the NTC
pin. Depending on the resistance value and the corresponding voltage on the NTC pin,
the converter reacts as shown in Figure 6 .
Peak current
I pk
I pk / 2
V th(ocp)SOURCE = 500 mV
V th(ocp)SOURCE = 250 mV
1
2
3
4
5
V NTC
001aan700
Fig 6.
NTC control curve
When the voltage on the NTC pin is higher than V th(high)NTC see Figure 6 (4), the converter
delivers nominal output current. When the voltage is lower than this level, the peak current
is gradually reduced until V th(low)NTC is reached, see Figure 6 (3). The peak current is now
half the peak current of nominal operation. When V act(tmr)NTC is passed, see Figure 6 (2) a
timer starts to run to distinguish between the following situations:
? If the low-level V deact(tmr)NTC is not reached within time t to(deact)NTC , Figure 6 (1) LED
overtemperature is detected. The IC stops switching and attempts to restart from the
HV pin voltage. Restart takes place when the voltage on NTC pin is higher than
V th(high)NTC , see Figure 6 (4). It is assumed that the reduction in peak current did not
result in a lower NTC temperature and LED OTP is activated.
? If the low-level V deact(tmr)NTC is reached within the time t to(deact)NTC , Figure 6 (1) it is
assumed that the pin is pulled down externally. The restart function is not triggered.
Instead, the output current is reduced to zero. PWM dimming can be implemented this
way. The output current rises again when the voltage is higher than V deact(tmr)NTC .
8.8.1 Soft-start function
The NTC pin can be used to make a soft start function. During switch-on, the level on the
NTC pin is low. By connecting a capacitor (in parallel with the NTC resistor), a time
constant can be defined. The time constant causes the level on the NTC pin to increase
slowly. When passing level V th(low)NTC Figure 6 (3), the convertor starts with half of the
maximum current. The output current slowly increases to maximum when V th(high)NTC
Figure 6 (4) is reached.
SSL21081T_2T_3T_4T
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3.1 — 22 February 2012
? NXP B.V. 2012. All rights reserved.
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