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UCC21759QDWRQ1 参数 Datasheet PDF下载

UCC21759QDWRQ1图片预览
型号: UCC21759QDWRQ1
PDF下载: 下载PDF文件 查看货源
内容描述: [适用于 IGBT/SiC MOSFET 且具有 DESAT 和内部钳位的汽车类 3.0kVrms、±10A 单通道隔离式栅极驱动器 | DW | 16 | -40 to 150]
分类和应用: 栅极驱动双极性晶体管驱动器
文件页数/大小: 57 页 / 2481 K
品牌: TI [ TEXAS INSTRUMENTS ]
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UCC21759-Q1  
SLUSEB4A – AUGUST 2020 – REVISED DECEMBER 2020  
www.ti.com  
UCC217xx  
In Module or  
Discrete  
VCC  
VDD  
13V to  
33V  
+
+
3V to 5.5V  
APWM  
œ
œ
AIN  
+
DEMOD  
MOD  
µC  
Rfilt  
Cfilt  
OSC  
GND  
COM  
Thermal  
Diode  
NTC or  
PTC  
Figure 9-7. Thermal Diode or Thermistor Temperature Sensing Configuration  
When a high-precision voltage supply for VCC is used on the primary side of UCC21759-Q1 the duty cycle  
output of APWM may also be filtered and the voltage measured using the microcontroller's ADC input pin, as  
shown in Figure 9-8. The frequency of APWM is 400kHz, so the value for Rfilt_2 and Cfilt_2 should be such that  
the cutoff frequency is below 400kHz. Temperature does not change rapidly, thus the rise time due to the RC  
constant of the filter is not under a strict requirement.  
UCC217xx  
VDD  
In Module or  
Discrete  
VCC  
13V to  
33V  
+
+
œ
3V to 5.5V  
APWM  
œ
AIN  
+
DEMOD  
MOD  
µC  
Rfilt_1  
Rfilt_2  
Cfilt_2  
GND  
OSC  
Cfilt_1  
COM  
Thermal  
Diode  
NTC or  
PTC  
Figure 9-8. APWM Channel with Filtered Output  
The example below shows the results using a 4.7kΩ NTC, NTCS0805E3472FMT, in series with a 3kΩ resistor  
and also the thermal diode using four diode-connected MMBT3904 NPN transistors. The sensed voltage of the 4  
MMBT3904 thermal diodes connected in series ranges from about 2.5V to 1.6V from 25°C to 135°C,  
corresponding to 50% to 68% duty cycle. The sensed voltage of the NTC thermistor connected in series with the  
3kΩ resistor ranges from about 1.5V to 0.6V from 25°C to 135°C, corresponding to 70% to 88% duty cycle. The  
voltage at VAIN of both sensors and the corresponding measured duty cycle at APWM is shown in Figure 9-9.  
Copyright © 2020 Texas Instruments Incorporated  
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