TEA1504 데이터 시트보기 (PDF) - Philips Electronics

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TEA1504

GreenChip™ SMPS control IC

Philips Electronics 

Philips Semiconductors

GreenChip™ SMPS control IC

Preliminary specification

TEA1504

APPLICATION INFORMATION

A converter using the TEA1504 is usually either a flyback

or a buck converter that comprises EMI filter, full bridge

rectifier, filter capacitor, transformer, output stage(s) and

some snubber circuitry. Depending upon the type of

feedback used, either an auxiliary winding (primary

regulation) or an opto-coupler (secondary regulation) is

used. Very few external components are used due to the

high level of chip integration. A sense resistor (Rsense)

converts the primary current into a voltage at Isense (pin 5).

The IC uses this voltage to set the peak current of the

converter. An auxiliary winding supplies capacitor Caux

which buffers the IC’s internal supply. The auxiliary

winding is also used as part of the primary output voltage

regulation circuit. A resistor (RREF) determines the IC’s

reference currents into REF (pin 8).

A capacitor (CCTRL) having a low value of typically

0.2 to 2 nF is used by the internal sample-and-hold circuit

to regulate the primary feedback circuit. CCTRL is

connected to CTRL (pin 9). This pin is also the input for

the opto-coupler signal in a secondary sensing

configuration. Pin 11 is connected to ground. The primary

side auxiliary winding is connected by resistor (RDEM)

to DEM (pin 13). The DEM input is also used for primary

side regulation. Input OOB (pin 14) implements both the

on/off and the burst mode standby functions. The supply

connected to Vi (pin 1) is used by the internal start-up

current source for charging capacitor Caux during start-up

and safe-restart modes.

For additional information also see: ‘application note

AN98011: “200 W SMPS with TEA1504”’.

handbook, full pagewidth

Vmains

output on/off

mode switch

S1

OOB 14

DEM 13

1 Vi

2 HVS

n.c. 12

3 n.c.

GND 11 TEA1504 4 DRIVER

n.c. 10

5 Isense

CTRL 9

6 Vaux

REF 8

7 DS

RDEM

RREF

Caux

power

MOSFET

Rsense

(1)

RCTRL

auxiliary

winding

Vo

Co

(1)

MGS575

(1) Secondary earthing points are isolated from their primary earthing points.

Fig.8 Typical flyback configuration with secondary sensing and on/off feature.

1999 Dec 07

13

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