HCPL-788J Datasheet, PDF (9/20 Pages) AVAGO TECHNOLOGIES LIMITED – Isolation Amplifier with Short Circuit and Overload Detection SO-16 Package

Notes:
1. In accordance with UL1577, each optocoupler is proof tested by applying an insulation test voltage ≥ 600 Vrms for 1 second. This test is
performed before the 100% production test for partial discharge (method b) shown in IEC/EN/DIN EN 60747-5-2 Insulation Characteristic Table,
if applicable.
2. The Input-Output Momentary Withstand Voltage is a dielectric voltage rating that should not be interpreted as an input-output
continuous voltage rating. For the continuous voltage rating refer to your equipment level safety specification or IEC/EN/DIN EN 60747-5-2
insulation characteristics table.
3. Device considered a two terminal device: pins 1-8 shorted together and pins 9-16 shorted together.
4. V must be applied to both pins 5 and 7. V must be applied to both pins 10 and 15.
DD1
DD2
5. If V exceeds V (due to power-up sequence, for example), the current into pin 11 (I ) should be limited to 20 mA or less.
REF
DD2
REF
6. Input Offset voltage is defined as the DC Input voltage required to obtain an output voltage (at pin 12) of V /2.
REF
7. This is the Absolute Value of Input Offset Change vs. Temperature.
8. This is the Absolute Value of V Gain Change vs. Temperature.
OUT
9. |V | must exceed this amount in order for the FAULT output to be activated.
IN+
10. ABSVAL is derived from V (which has the gain and offset tolerances stated earlier). ABSVAL is 0 V when V = 0 V and increases toward V as
OUT
IN
REF
V_IN approaches +256 mV or -256 mV. H_ABS is the difference between the actual ABSVAL output and what ABSVAL should be, given the value of
V.
OUT
H_ABS
is
expressed
in
terms
of
percent
of
full
scale
and
is
defined
as:
|ABSVAL - 2 x | V - V / 2| |
OUT REF
x 100.
V
REF
11. CMRR is defined as the ratio of the gain for differential inputs applied between pins 1 and 2 to the gain for common mode inputs applied to
IN
both pins 1 and 2 with respect to pin 8.
12. The signal-to-noise ratio of the HCPL-788J can be improved with the addition of an external low pass filter to the output. See Frequently Asked
Question #4.2 in the Applications Information Section at the end of this data sheet.
13. As measured from 50% of V to 50% of V .
IN
OUT
14. This is the amount of time from when the FAULT Detection Threshold (230 mV ≤ V ≤ 280 mV) is exceeded to when the FAULT output goes
THF
low.
15. This is the amount of time for the FAULT Output to return to a high state once the FAULT Detection Threshold (230 mV ≤ V_THF ≤ 280 mV) is no
longer exceeded.
16. Input pulses shorter than the fault rejection pulse width (t ), will not activate the FAULT (pin 14) output. See Frequently Asked Question #2.3
REJECT
in the Applications Information Section at the end of this data sheet for additional detail on how to avoid false tripping of the FAULT output due
to cable capacitance charging transients.
17. CMTI is also known as Common Mode Rejection or Isolation Mode Rejection. It is tested by applying an exponentially rising falling voltage
step on pin 8 (GND1) with respect to pin 9 (GND2). The rise time of the test waveform is set to approximately 50 ns. The amplitude of the step
is adjusted until V (pin 12) exhibits more than 100 mV deviation from the average output voltage for more than 1μs. The HCPL-788J will
OUT
continue to function if more than 10 kV/μs common mode slopes are applied, as long as the break-down voltage limitations are observed. [The
HCPL-788J still functions with common mode slopes above 10 kV/μs, but output noise may increase to as much as 600 mV peak to peak.]
18. CMRR is defined as the ratio of differential signal gain (signal applied differentially between pins 1 and 2) to the common mode gain (input pins
tied to pin 8 and the signal applied between the input and the output of the isolation amplifier) at 60 Hz, expressed in dB.
9