参数资料
| 型号： | NCV7240DPR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 16/26页 |
| 文件大小： | 0K |
| 描述： | IC DVR RELAY 8CH LOW SIDE 24SSOP |
| 标准包装： | 2,500 |
| 系列： | * |
NCV7240
Vbat
VDD
OUTx
VDDA
V BAT
Z2
Z1
g
s
drain
GND
V Clamp = 36V (min) to 44V (max) Powered
VDD
OUTx
VDDA
V BAT
Vdrain = VZ 1 + VZ 2 + Vgs
GND
Alternative
Driver
Source
V Clamp = 36V (min) to 44V (max) Un-pow-
ered
Figure 22. Output Clamp
Over Temperature / Thermal Shutdown
The NCV7240 incorporates eight individual thermal sensors located in proximity to each output driver. A channel is latched
off upon the detection of an Over Temperature event. This allows operation of unaffected channels before, during, and after
a channel detection of over temperature. The thermal shutdown detection threshold is typically 175 ° C with 25 ° C of hysteresis.
Open Load Detection
Open Load Detection is achieved for each output with the Open Load Detection Threshold Voltage reference voltage (Vol)
and its’ corresponding Open Load Diagnostic Sink Current (when the output driver (OUTx) is off). The output driver maintains
its’ functionality with and without the open bit set (i.e. it can turn on and off).
During normal operation, the open circuit impedance (Roc) is 0 W . This sets the voltage on OUTx to V BAT volts. As long
as V BAT is above Vol no open circuit fault will be recognized. The voltage appearing on OUTx is a result of V BAT and the voltage
drop across Roc realized by the current flow created by Iol.
The NCV7240 voltage level trip points are referenced to ground. The threshold range is between 1.0 V and 2.5 V.
With a nominal battery voltage (V BAT ) of 14 V, the resultant worst case thresholds of detection are as follows.
V BAT * OpenLoadDetectionThresholdVoltage
OpenLoadDiagnosticSinkCurrent
+ OpenLoad Impedance
14 V * 2.5 V
100 m A
+ 115 k W
14 V * 1.0 V
20 m A
+ 650 k W
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