CS1601-FSZ(2011) Просмотр технического описания (PDF) - Cirrus Logic

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CS1601-FSZ
(Rev.:2011)

Digital PFC Controller for Electronic Ballasts

Cirrus Logic 

CS1601

5.15 Summary of Equations

Eq. #

1

Equation

Output Power (page 10)

Po =     Vinmin2  V---2--l-i--n--k---f-–m-----a--V-x---i--n----L-m---B-i-n------V-----l-i-n--2-k----

Po



Output Power w/ recommended values (page 10)

Variables/Recommended Values

Rated output power of the system.

Efficiency of the boost converter (estimated as

100% by the PFC algorithm).

2

Po =     90Vrms2  4-2---0---0----7V---0--–--k---H--9---z-0---V-----r-L-m--B---s------4---0---0--2-V---

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

measured after the rectifier and EMI filter.

Boost Inductor (page 10)

Vlink

Nominal PFC output voltage must be 400V.

3

LB =     90Vrms2  -42---0---0---7-V---0--–-k----H--9---z-0---V-----rP--mo-----s------4---0---0--2-V---

fmax

Maximum switching frequency is 70kHz.

Output IFB Sense Resistor (page 11)

LB

Boost inductor specified by rated power

requirement.

4

RIFB = V-----l-i-n---k-I--r-–-e---f-V----D----D-- = -4---0---01----2V---9--–-----VA----D----D--



Margin factor to guarantee rated output power

(Po) against boost inductor tolerances.

Input IAC Sense Resistor (page 11)

5

RIAC = RIFB

RIAC Value of the IAC pin sense resistor(s).

Auxiliary Winding Cut-off Frequency (page 12) RIFB

Value of the IFB pin sense resistor(s).

6

fc = 1  2R3  R4Cp

Iref

Value of the fixed, internal reference current.

Maximum Response Time for Brownout: (page 12)

7

TBrownout = 8 ms + 8--5---m--V---s- 128 V – VBPth + 56 ms

fc

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

ringing frequency or fc = 10MHz.

Overvoltage Protection (page 12)

Cp

Capacitance at the ZCD pin. Cp<10pF.

8

VOVP = RIFB  IOVP + VDD

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

Boost Inductor Peak Current

9

ILBpk

=

--------------4----------P----O---------------

  Vinmin  2

Cout

Value of the output capacitor in microfarads.

fline(min) Minimum line frequency.

Boost Inductor RMS Current

10

ILBrms = V-----i-n-----m-P---i-O-n------------

VDD

IC Supply Voltage.

Vlink Voltage Ripple

VOVP OVP threshold.

11

Vlinkrip = 2--------------f--l-i-n---e-----m-----i-n-P----O------V----l-i--n---k--------C-----o---u--t

IOVP

Current into the IFB pin.

14

DS931PP6

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