TEA1501T 查看數據表（PDF） - Philips Electronics

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TEA1501T

GreenChip SMPS controller IC

Philips Electronics 

Philips Semiconductors

TEA1501

GreenChip SMPS controller IC

7.4.3 Leading edge blanking

The leading edge blanking time is determined by the reference resistor RREF as shown

below:

tLEB = tcons tant + (kLEB × RREF )

The leading edge blanking time consists of a constant time and a time which tracks with

the period time of the switch oscillator.

7.4.4 Burst oscillator

The power threshold for data transfer is determined by the burst frequency, according to

the following formula:

7.4.4.1

Pdata

=

η

×

12--

×

Lp

×

I

2

prim

×

f burst × Ndata

The power ratio Pdata : Pout(max) is therefore:

P----o--P-u---dt--(a--m-t--a-a--x---) = -f---b---u---rf--s-s-t-w--×--i--t-Nc---h--d--a---t--a-

The desired Pdata : Pout(max) ratio determines the burst frequency. For example, when the

desired Pdata : Pout(max) ratio is 0.5 then the burst frequency has to be 450 Hz at 50 kHz

switching frequency. The burst frequency can be adjusted by the reference resistor RREF

and the burst capacitor CBURST as shown below:

fburst = k----b--u---r--s---t--×-----R----R----E-1--F-----×----C-----B---U----R---S---T--

Minimum value of CBURST

The minimum value for capacitor CBURST is 3.3 nF.

900

fburst

(Hz)

fswitch = 50 kHz

450

fswitch = 20 kHz

180

0

0

0.5

1

Pdata/Pout(max)

mgm827

Fig 8. Burst frequency as a function of power ratio

TEA1501_2

Product data sheet

Rev. 02 — 31 March 2006

© Koninklijke Philips Electronics N.V. 2006. All rights reserved.

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