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參數(shù)資料
| 型號： | LB11691 |
| 元件分類： | 運動控制電子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 0.05 A, PDIP36 |
| 封裝： | 0.400 INCH, DIP-36 |
| 文件頁數(shù)： | 9/19頁 |
| 文件大?。?/td> | 204K |
| 代理商： | LB11691 |
TDF8546
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 3 — 30 August 2011
17 of 61
NXP Semiconductors
TDF8546
I2C-bus controlled 4
45 W best efficiency amplifier
7.5.4 Overvoltage warning and load dump protection
If the battery voltage VP exceeds the maximum value of Vth(ovp), the device switches off
the output stages of the amplifier to protect the output transistors. The overvoltage
pre-warning bit is set when the supply voltage level exceeds the value of VP(ovp)pwarn.
The functionality of the diagnostic output can be chosen in I2C-bus mode. In this mode the
pre-warning information can become visible at the diagnostic output. In legacy mode, pin
DIAG will not be activated under pre-warning conditions.
Although the amplifier switches off the output stages, the device remains operational
during load dump conditions (maximum value of VP at load dump protection; duration
50 ms, rise time > 2.5 ms). The occurrence of the load dump situation can last for a longer
period of time without damaging the device. Provided that the I2C-bus supply is within the
levels specified, communication with the I2C-bus bus during load dump situations remains
possible and the status of the channel outputs can be read.
7.5.5 Thermal pre-warning and thermal protection
If the average junction temperature reaches one of the adjustable levels set via the
I2C-bus, selected with IB3[D4], pre-warning is activated resulting in pin DIAG LOW (if
selected) and can be read via the I2C-bus. The default setting for the thermal pre-warning
is IB3[D4] = 0 setting the warning level at Tj(AV)(pwarn) = 160 C. In legacy mode the
thermal pre-warning is also set at Tj(AV)(pwarn) = 160 C.
If the temperature increases further, the temperature-controlled gain reduction is activated
for all four channels to reduce the output power; see Figure 13. If this does not reduce the
average junction temperature, all four channels are switched off at the absolute maximum
temperature Toff.
If the temperature controlled gain is activated, mute is activated and best efficiency mode
is deactivated.
7.6 Diagnostics
Diagnostic information can be read via the I2C-bus, but can also be made available at pin
DIAG or pin STB. Pin DIAG indicates information such as POR occurred, low battery, and
high battery; the output load fault information is selectable via the I2C-bus. This
Fig 13. Temperature controlled amplifier gain
001aam696
10
20
30
G
(dB)
0
Tj (°C)
140
190
180
160
170
150
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