ICE3AR1580VJZ Datasheet, PDF (28/43 Pages) Infineon Technologies AG – Of f -Line SMPS Cur rent Mode Cont rol ler wi th integrated 800V

CoolSET™ F3R80
ICE3AR1580VJZ
Functional Description
The IC implemented with hysteresis voltage to leave the input OVP protection. The hysteresis voltage at BV pin is
V_{OVP_hys} (0.07V) and the input OVP reset voltage at BV pin is V_{OVP_ref} - V_{OVP_hys}; i.e. 1.91V. After the input OVP
protection is triggered, the voltage at BV pin needs to drop V_{OVP_hys} from V_{OVP_ref} before it can be reset.
When the BV voltage drops below 1.91V, the output of C14b and G22 are high (Figure 32). The “R” input of the
FF5 is high. Then the “Q” output of FF5 is low. The input OVP is reset. The system will turn on with soft start in the
coming restart cycle when Vcc reaches the Vcc “ON” voltage at 17V.
The input OVP feature can also be applied to customer defined protection circuit by pulling up the BV pin to
larger than V_{OVP_ref}.
The formula to calculate the R_OV1 and R_OV2 are as below.
Set R_OV1 to a particular value.
R_OV2= R_OV1* V_{OVP_ref} /(V_OVP ^- V_{OVP_ref})
The formula to calculate the input OVP reset voltage is as below.
V_{OVP_reset}=(V_{OVP_ref} ^-V_{OVP_hys})*( R_OV1+ROV2)/ROV2
where V_OVP: input over voltage; V_{OVP_reset}: input over reset voltage; V_{OVP_ref}: IC reference voltage for OVP; V_{OVP_hys}: IC
hysteresis voltage for OVP; R_OV1 and R_OV2: resistors divider from input voltage to BV pin.
For example,
V_{OVP_ref}=1.98V, V_{OVP_hys}=0.07V
If input OVP voltage, V_OVP=424Vdc (300Vac), R_OV1=9MΩ, R_OV2=42.2KΩ
Input OVP reset, V_{OVP_reset}=408Vdc (289Vac)
To disable input OVP feature, the BV pin must be connected with a resistor R_OV2≥15KΩ to IC ground and
remove R_OV1.
(Remark: R_OV2 must be always ≥15KΩ in all conditions, otherwise overload protection may not work)
3.7.5 Action sequence at BV pin
Since there are 2 functions at the same BV pin; input OVP and extended blanking time, the action of sequence is
whichever starts first takes the priority. When the “Extended blanking time” is triggered by OLP and follows with the
“Input OVP” triggering, then the OLP will continue to work until it ends. The IC would recheck the signal at BV pin
after one skip cycle. If the BV signal exceeds the input OVP threshold, it would go to input OVP mode.
Data Sheet
28
V2.0, 2014-01-20