TEA1501 查看數據表（PDF） - Philips Electronics

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TEA1501

GreenChip SMPS controller IC

Philips Electronics 

Philips Semiconductors

TEA1501

GreenChip SMPS controller IC

The Burst mode operates by switching at high frequency until VAUX reaches its regulation

level of 20 V. The TEA1501 stops switching until the time period set by the burst oscillator

has expired. At the start of the next burst period the TEA1501 starts switching at high

frequency and repeats the cycle again.

To guarantee a stable operation in a Burst mode controlled system a VAUX slope

compensation circuit is integrated in the TEA1501. The TEA1501 delivers a constant

voltage to the secondary load until a burst duty cycle of 40 % is reached.

7.1.4 Data transfer

The TEA1501 has a data transfer function which makes communication from the isolated

secondary side to the non-isolated primary side of the transformer possible, without using

an opto-coupler. This communication function is activated by increasing the secondary

load. With this data transfer function a main power supply can be switched on and off by

the system of the TEA1501.

The power delivered to the secondary and auxiliary winding is proportional to the number

of primary current pulses per burst period, provided that the converter operates in

Discontinuous conduction mode. During each burst period the number of primary current

pulses is counted. A threshold (Ndata) of 56 pulses is integrated. The clamp level on the

OOD pin is set to data-on level from data-off level in case the Ndata threshold is passed.

This data-on clamp level can be sensed by the on/off input of a main supply control IC of

the GreenChip family. The data-on clamp level is maintained until a burst appears with a

number of pulses below the Ndata threshold.

TEA1501_2

Product data sheet

Rev. 02 — 31 March 2006

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

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