Texas Instruments DRV604PWPEVM, User Manual

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( )
UVP
R2 + R3
V = 1.25 V
R3
´
Hysteresis
R2
V = 5 μA × R4 + 1
R3
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Layout Recommendations
The selected thresholds can be determined as follows:
With the condition R4 >> R2||R3
For example, to obtain V
UVP
= 4.5V and 400mV hysteresis, we can use R2=10k, R3=3k9 and R4 = 22k.
To filter supply spikes and noise a capacitor across R3 can be added.
5 Layout Recommendations
The charge pump capacitors, C28 and C29, should be routed with as short a track as possible, the same
goes for the supply decoupling caps, C3, C4 and C11, C13. To avoid ground loop induced hum, the
AGND, PGND and the audio input GND tracks should be routed as star ground connections – this is the
concept used on DRV604PWPEVM.
6 DRV604PWPEVM Performance
Table 4. General Test Conditions
(1)
General Test Conditions Notes
Supply voltage 5.0 V
Load impedance 5 k Ω
Input signal 1 kHz Sine
Measurement filter AES17
(1)
These test conditions are used for all tests, unless otherwise specified.
Table 5. Electrical Data
Electrical Data Notes/Conditions
Output voltage, 5 k
Ω
2.1 Vrms 1 kHz, 1% THD+N, T
A
= 25°C
Output voltage, 100 k Ω 2.2 Vrms 1 kHz, 1% THD+N, T
A
= 25°C
Supply current < 30 mA 1 kHz, 40mW at 32 Ω and 2Vrms at 5 k Ω
7 SLOU288 – February 2010 DRV604PWPEVM
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