TEA1532 Просмотр технического описания (PDF) - Philips Electronics

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TEA1532

GreenChip™II SMPS control IC

Philips Electronics 

Philips Semiconductors

TEA1532

GreenChip™II SMPS control IC

Vi

CVCC

1

8

2 TEA1532T 7

TEA1532P

3

6

4

5

coa015

Fig 4. Typical configuration

The TEA1532 can operate in multi modes; see Figure 5.

f

(kHz)

63

Cycle

skip

fixed

coa017

FF-CCM

QR

P (W)

Fig 5. Multi mode and FF-CCM operation.

In QR mode, the next converter stroke is started only after demagnetization of the

transformer current (zero current switching), while the drain voltage has reached the

lowest voltage to minimize switching losses (green function). The primary resonant circuit

of primary inductance and drain capacitor ensures this quasi-resonant operation. The

design can be optimized in such a way that zero voltage switching can extend over most of

the universal mains range.

9397 750 13113

Preliminary data sheet

To prevent very high frequency operation at lower loads, the quasi-resonant operation

changes smoothly in fixed frequency Pulse Width Modulation (PWM) control.

Rev. 01 — 28 May 2004

© Koninklijke Philips Electronics N.V. 2004. All rights reserved.

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