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參數(shù)資料
| 型號： | AND8116D |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | Integrated Relay/Inductive Load Drivers for Industrial and Automotive Applications |
| 中文描述： | 綜合繼電器/工業(yè)和汽車應用感性負載驅動程序 |
| 文件頁數(shù)： | 3/8頁 |
| 文件大?。?/td> | 90K |
| 代理商： | AND8116D |
AND8116/D
http://onsemi.com
3
The 40 V Nchannel FET is designed to switch the relay’s
coil for currents up to 500 mA. The clamping protection
Zener diodes (14 V) provides a clamp function to suppress
the voltage spike generated by the relay’s coil during the
turnoff interactions (V = Ldi/dt). The ESD protection
Zener diodes protects the gatesource silicon junction
against ESD conditions possibly induced by persons during
the handling or assembly of the device. And the bias resistor
provides the drive control signals to the FET.
Figure 3 illustrates the typical connection diagram of the
NUD3105 / NUD3112 devices:
Figure 3. Typical Connection Diagram
(NUD3105 5.0 V Relay’s Coils and NUD3112 for 12 V)
1.0 k
300 k
ESD
Zener
14 V
ESD
Zener
14 V
Clamp Zener
7 V or 14 V
Clamp Zener
7 V or 14 V
+5 V/3.3 V
LOGIC
+12 V/5.0 V
RELAY
0
NUD3105, NUD3112
When positive logic voltage is applied to the gate of the
device (5.0 V/3.3 V), the FET is turnedon which activates
the relay. When the FET is turnedoff, the relay’s coil is
deactivated which causes it to kickback and generates a high
voltage spike, this voltage spike is suppressed by the clamp
Zener diodes placed across the FET. This operation
sequence is repeated for all the on and off operations of the
relay driver.
Figure 4 shows the voltage and current
waveforms generated across the NUD3112 relay driver
when it is controlling an OMRON relay (G8TB1A64).
This relay has the following coil characteristics: L = 46 mH,
Rdc = 100 . The current that the relay takes for 12 V of
supply voltage is 120 mA. The integrated FET has a typical
onresistance of 1.0
, therefore the power dissipation
generated in the FET is around 15 mW (P = I
2
R) at 25
°
C of
ambient temperature. It results in an onvoltage drop of only
125 mV at 120 mA of current.
Figure 4. Traces Generated Across NUD3112 Device
when Driving OMRON Relay G8TB1A64
V
GS
– 10 V/div
V
DS
– 10 V/div
I
D
– 50 mA/div
V
SUPPLY
– 10 V/div
Inductor
kick back
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