CS1601-FSZ datasheet(14/16 Pages) CIRRUS

14 / 16 page

CS1601

DS931PP6

5.15 Summary of Equations

Eq. #

Equation

Variables/Recommended Values

Output Power (page 10)

Rated output power of the system.



Efficiency of the boost converter (estimated as

100% by the PFC algorithm).

Vin(min) Minimum RMS line voltage is 90Vrms,

measured after the rectifier and EMI filter.

Vlink

Nominal PFC output voltage must be 400V.

fmax

Maximum switching frequency is 70kHz.

Boost inductor specified by rated power

requirement.



Margin factor to guarantee rated output power

(Po) against boost inductor tolerances.

RIAC

Value of the IAC pin sense resistor(s).

RIFB

Value of the IFB pin sense resistor(s).

Iref

Value of the fixed, internal reference current.

The cut-off frequency, fc, needs to be 10x the

ringing frequency or fc = 10MHz.

Capacitance at the ZCD pin. Cp<10pF.

VBP(th)

Brownout threshold voltage. VBP(th) = 94.8V.

Cout

Value of the output capacitor in microfarads.

fline(min) Minimum line frequency.

VDD

IC Supply Voltage.

VOVP

OVP threshold.

IOVP

Current into the IFB pin.

Output Power w/ recommended values (page 10)

Boost Inductor (page 10)

Output IFB Sense Resistor (page 11)

Input IAC Sense Resistor (page 11)

Auxiliary Winding Cut-off Frequency (page 12)

Maximum Response Time for Brownout: (page 12)

Overvoltage Protection

(page 12)

Boost Inductor Peak Current

Boost Inductor RMS Current

Vlink Voltage Ripple



Vin min





Vlink

Vin min







–

2fmax LB Vlink



---------------------------------------------------------





90Vrms





400V

90Vrms





–

270kHz

LB 400V



-------------------------------------------------------------





90Vrms





400V

90Vrms





–

270kHz Po

400V



-------------------------------------------------------------



RIFB

Vlink VDD

–

Iref

-----------------------------

400V VDD

–

129

A

-------------------------------

RIAC

RIFB

 R3 R4



C





TBrownout

8ms

------------ 128 V VBP th



–

 56 ms

VOVP

RIFB IOVP



VDD

ILB pk



4PO



 V



in min





--------------------------------------------

ILB rms



Vin min







------------------------------

V

link rip



 f

line min





Vlink



Cout



------------------------------------------------------------------------

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