MC44608 查看數據表（PDF） - Motorola => Freescale

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MC44608

Few External Components Reliable and Flexible GreenLine™ Very High Voltage PWM Controller

Motorola => Freescale 

EQUATION 8

MC44608

+ dBM

ȧȧȥȡȢǒ Ǔ ȧȧȧȡȢ ǒ ǓȧȧȧȣȤȧȧȦȣȤ ) ) 1

k1

IG

Istup

1

ń ) ń kS Stup (kS L

1

)

) k2 Ipin3

Istup

where: k1 = Iccs/Istup

k2 = IccL/Istup

kS/Stup = (Vstup–UVLO2)/(Vstup–UVLO1)

kS/L = (UVLO1–UVLO2)/(Vstup–UVLO1)

PULSED MODE CURRENT SENSE CLAMPING LEVEL

Equations 9, 10, 11 and 12 allow the calculation of the Rcs value for the desired maximum current peak value during the

SMPS stand–by mode.

EQUATION 9

+ * Ipkstby

Vcs–th (Rcs

RS

Ics)

where: Vcs–th is the CS comparator threshold

Ics is the CS internal current source

RS is the sensing resistor

Rcs is the resistor connected between pin 2 and RS

EQUATION 10

+ Ipkstby Vcs–th

ǒ Ǔ *1

Rcs

Ics

Vcs–th

RS

EQUATION 11

+ Ipkstby Vcs–th

*1 (Rcs Ycs–stby )

RS

where: Ycs–stby = Ics/Vcs–th

Taking into account the circuit propagation delay (dtcs) and the Power Switch reaction time (dtps):

+ ƪ EQUATION 12

Ipkstby

Vcs–th

*1 (Rcs

ƫ ) Ycs–stby)

Vin

RS

) (dtcs dtps)

Lp

10

MOTOROLA ANALOG IC DEVICE DATA

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