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参数资料
| 型号： | AD816 |
| 厂商： | Analog Devices, Inc. |
| 英文描述： | 500 mA Differential Driver & Dual Low Noise (VF) Amplifiers(500mA差分驱动器和双低噪电压反馈放大器) |
| 中文描述： | 500毫安差分驱动器 |
| 文件页数： | 13/16页 |
| 文件大小： | 479K |
| 代理商： | AD816 |
AD816
REV. 0
–13–
Normally, the AD816 will be soldered directly to a copper pad.
Figure 47 plots
θ
JA
against size of copper pad. This data pertains
to copper pads on both sides of G10 epoxy glass board connected
together with a grid of feedthroughs on 5 mm centers.
This data shows that loads of 100 ohms or greater will usually
not require any more than this. This is a feature of the AD816’s
15-lead power SIP package.
An important component of
θ
JA
is the thermal resistance of the
package to heatsink. The data given is for a direct soldered
connection of package to copper pad. The use of heatsink
grease either with or without an insulating washer will increase
this number. Several options now exist for dry thermal connec-
tions. These are available from Bergquist as part # SP600-90.
Consult with the manufacturer of these products for details of
their application.
COPPER HEAT SINK AREA (TOP AND BOTTOM) – mm
2
35
30
10
0
2.5k
0.5k
θ
J
°
C
1k
1.5k
2k
25
20
15
AD816AVR, AY
(θ
JC
= 2
°
C/W)
1
2
3
COPPER HEAT SINK AREA (TOP AND BOTTOM) – in
2
Figure 47. Power Package Thermal Resistance vs. Heat
Sink Area
Other Power Considerations
There are additional power considerations applicable to the
AD816. First, as with many current feedback amplifiers, there is an
increase in supply current when delivering a large peak-to-peak
voltage to a resistive load at high frequencies. This behavior is
affected by the load present at the amplifier’s output. Figure 12
summarizes the full power response capabilities of the AD816
driver. These curves apply to the differential driver applications
(right-hand side of Figure 52). In Figure 12, maximum
continuous peak-to-peak output voltage is plotted vs. frequency
for various resistive loads. Exceeding this value on a continuous
basis can damage the AD816.
The AD816 is equipped with a thermal shutdown circuit. This
circuit ensures that the temperature of the AD816 die remains
below a safe level. In normal operation, the circuit shuts down
the AD816 at approximately 180
°
C and allows the circuit to
turn back on at approximately 140
°
C. This built-in hysteresis
means that a sustained thermal overload will cycle between
power-on and power-off conditions. The thermal cycling
typically occurs at a rate of 1 ms to several seconds, depending
on the power dissipation and the thermal time constants of the
package and heat sinking. Figures 48 and 49 illustrate the
thermal shutdown operation after driving OUT1 to the + rail,
and OUT2 to the – rail, and then short-circuiting to ground
each output of the AD816. The AD816 will not be damaged by
momentary operation in this state, but the overload condition
should be removed.
10
0%
100
90
OUT 1
200μs
5V
OUT 2
Figure 48. OUT2 Shorted to Ground Through a 2
Resistor, Square Wave Is OUT1, R
F
= 1 k
, R
G
= 222
10
0%
100
90
OUT 1
5ms
5V
OUT 2
Figure 49. OUT1 Shorted to Ground Through a 2
Resistor, Square Wave Is OUT2, R
F
= 1 k
, R
G
= 222
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD816AVR | 制造商:Rochester Electronics LLC 功能描述:ADSL TRANSCEIVER - Bulk |
| AD816AY | 制造商:Rochester Electronics LLC 功能描述:ADSL TRANSCEIVER - Bulk |
| AD816AYR | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
| AD816AYS | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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