DAP005 datasheet(31/39 Pages) STMICROELECTRONICS

部件名	DAP005

功能描述	Advanced transition-mode PFC controller

PDF	39 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

31 / 39 page

DAP005

Brownout protection

31/39

If this is not the case or it is not possible to achieve a start-up delay long enough (because

this prevents the DC-DC stage from starting up correctly) or, simply, the PWM controller is

devoid of soft start, the arrangement of Figure 45 lets the DC-DC converter start up when

the voltage generated by the PFC stage reaches a preset value. The technique relies on the

UVLO thresholds of the PWM controller.

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.

Figure 44. Interface circuits that let the switch on or off a PWM controller

Figure 45. Interface circuits for actual power-up sequencing (master PFC)

DAP005

DAP01A

DAP015

DAP01A

DAP015

AC_OK

DAP005

AC_OK

DAP005 数据表(PDF) 31 Page - STMicroelectronics