ML4803CS-2 datasheet(10/13 Pages) MICRO-LINEAR

10 / 13 page

ML4803

February 1999

inductor. The VCC OVP comparator senses when this

voltage exceeds 16V, and terminates the PFC output drive

while disabling the VEAO current sink. Once the VEAO

current sink is disabled, the VEAO voltage will charge

unabated, except for a diode clamp to VCC, reducing the

PFC pulse width. Once the VCC rail has decreased to

below 16.2V the VEAO sink will be enabled, discharging

external VEAO compensation components until the steady

state voltage is reached. Given that 15V on VCC

corresponds to 400V on the PFC output, 16V on VCC

corresponds to an OVP level of 426V.

COMPONENT REDUCTION

Components associated with the VRMS and IRMS pins of a

typical PFC controller such as the ML4824 have been

eliminated. The PFC power limit and bandwidth does vary

with line voltage. Double the power can be delivered from

a 220 V AC line versus a 110 V AC line. Since this is a

combination PFC/PWM, the power to the load is limited

by the PWM stage.

Figure 11. ML4803 PFC Control

Figure 10. Typical Peak Current Mode Waveforms

TYPICAL APPLICATIONS (Continued)

VISENSE

VC1 RAMP

GATE

DRIVE

OUTPUT

CZERO

ISENSE

VC1

VI SENSE

GATE

OUTPUT

RCOMP

VOUT = 400V

VEAO

35µA

–

COMP

–4

CCOMP

30pF

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