L6564HTR STMicroelectronics, L6564HTR Datasheet - Page 25

• Manufacturer Part Number: L6564HTR
• Description: Power Factor Correction ICs High Volt Start Up 700V PFC 100uA 6mA
• Manufacturer: STMicroelectronics

Specifications of L6564HTR

• Product Category: Power Factor Correction ICs
• Rohs: yes
• Maximum Power Dissipation: 0.75 W
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Package / Case: SO-14
• Minimum Operating Temperature: - 25 C

L6564H
Application information
Figure 37. Interface circuits that let the DC-DC converter’s controller IC disable the
L6564H
Another function available is the brownout protection which is basically a not-latched
shutdown function that is activated when a condition of mains undervoltage is detected. This
condition may cause overheating of the primary power section due to an excess of RMS
current. Brownout can also cause the PFC pre-regulator to function in open loop and this
may be dangerous to the PFC stage itself and the downstream converter, should the input
voltage return abruptly to its rated value. Another problem is the spurious restarts that may
occur during converter power-down and that cause the output voltage of the converter not to
decay to zero monotonically. For these reasons it is usually preferable to shut down the unit
in case of brownout. The brownout threshold is internally fixed at 0.8 V and is sensed on the
VFF pin (#5) during the voltage falling and an 80 mV threshold hysteresis prevents
rebounding at input voltage turn-off. In
Table 5
it is possible to find a summary of all of the
above mentioned working conditions that cause the device to stop operating.
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