CS1601H Просмотр технического описания (PDF) - Cirrus Logic

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CS1601H

Digital PFC Controller for Electronic Ballasts

Cirrus Logic 

CS1601

5.15 Summary of Equations

Eq. #

Equation

Output Power (page 10)

1

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----

Output Power with recommended values (page 10)

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---

Boost Inductor (page 10)

3

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

Variables/Recommended Values

Po

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.

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 mF.

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

DS931F3

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