参数资料
| 型号： | ADN8831-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 17/20页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR ADN8831 |
| 标准包装： | 1 |
| 相关产品： | ADN8831ACPZ-REEL7DKR-ND - IC THERMO COOLER CTRLR 32LFCSP ADN8831ACPZ-REEL7CT-ND - IC THERMO COOLER CTRLR 32LFCSP ADN8831ACPZ-REEL7TR-ND - IC THERMO COOLER CTRLR 32LFCSP |
Data Sheet
MOSFET DRIVER AMPLIFIER
The ADN8831 has two separate MOSFET drivers: a switched
output or pulse-width modulated (PWM) amplifier, and a high
gain linear amplifier. Each amplifier has a pair of outputs that drive
the gates of external MOSFETs which, in turn, drive the TEC as
shown in Figure 17. A voltage across the TEC is monitored via
SFB (Pin 23) and LFB (Pin 27). Although both MOSFET drivers
achieve the same result, to provide constant voltage and high
current, their operation is different. The exact equations for the
two outputs are
V LFB = V B ? 40 ( V OUT2 ? 1 . 25 )
V SFB = V LFB + 5 ( V OUT2 ? 1 . 25 )
where:
V OUT2 is the voltage at OUT2 (Pin 7).
V B is determined by V DD as
V B = 1 . 5 V [ V DD < 4 . 0 V ]
V B = 2 . 5 V [ V DD > 4 . 0 V ]
The voltage at OUT2 (Pin 7) is determined by the compensation
network that receives temperature set voltage and thermistor
5.0
2.5
0
5.0
2.5
0
5.0
2.5
0
–2.5
ADN8831
voltage fed by the input amplifier. V LFB has a low limit of 0 V
and an upper limit of V DD . Figure 21 shows the graphs of these
equations.
–5.0
0
0.25 0.75 1.25 1.75 2.25
OUT2 (V)
Figure 21. OUT2 Voltage vs. TEC Voltage
2.75
Rev. A | Page 17 of 20
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