ST ST7538Q, Application Note

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AN2744 Electrical characteristics
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1 Electrical characteristics
Table 1. Electrical characteristics of the ST7538Q dual channel reference design
Parameter Value Notes
Min. Typ. Max.
Operating condition
Ambient operating
temperature
85 °C
If junction temperature
exceeds 180 °C the device
shuts down
Transceiver section
Selectable channel frequencies: 72 kHz (CH1), 86 kHz (CH2)
Transmitting specifications (Tx Mode)
Transmitting output voltage
level
2 V
RMS
2.25 V
RMS
R20 = 3.9 k
Ω
, R22=2.2 k
Ω
– see Table 2
Transmitting output current
limit
325 mA
RMS
R19 = 2 k
Ω
– see Figure 2
Second harmonic distortion -55 dB
Loaded with CISPR 16-1
network
Third harmonic distortion -61 dB
Loaded with CISPR 16-1
network
50 Hz attenuation 100 dB
Receiving specifications (Rx Mode)
Minimum detectable Rx signal 53 dB/µV
RMS
BER<10
-3
, negligible noise
Auxiliary supply
5 V linear regulator (VDC)
output voltage
-5% 5.05 V +5% ST7538Q internally generated
5 V linear regulator (VDC)
current capability
100 mA
Power supply section
AC mains voltage range 85 V 265 V
Mains frequency 50-60 Hz
Output voltage -10% 10 V +10% Green LED ON
Output voltage ripple 1%
I
OUT
= 600 mA, V
IN
=85 V
AC
Output current 600 mA
Output power 5.6 W
Efficiency at P
OUT
= 3.5 W 70%
Nominal transformer
isolation
(1)
4 kV
Primary to secondary/
secondary to auxiliary
Number of holdup cycles 0