Philips TEA 1623P, TEA1623PH Service Manual

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TEA1623P; TEA1623PH

STARplug

Rev. 01 — 17 March 2004 Product data sheet

1. General description

The TEA1623P; TEA1623PH is a Switched Mode Power Supply (SMPS) controller IC that operates directly from the rectiﬁed universal mains. It is implemented in the high voltage EZ-HV™ SOI process, combined with a low voltage BICMOS process.

The device includes a high voltage power switch and a circuit for start-up directly from the rectiﬁed mains voltage. A dedicated circuit for valley switching is built in, which makes a very efﬁcient slim-line electronic power-plug concept possible.

In its most basic version of application, the TEA1623P; TEA1623PH acts as a voltage source. Here, no additional secondary electronics are required. A combined voltage and current source can be realized with minimum costs for external components. Implementation of the TEA1623P; TEA1623PH renders an efﬁcient and low cost power supply system.

2. Features

■ Designed for general purpose supplies

■ Integrated power switch: 6.5 Ω and 650 V

■ Operates from universal AC mains supplies: 80 V to 276 V

■ Adjustable frequency for ﬂexible design

■ RC oscillator for load insensitive regulation loop constant

■ Valley switching for minimum switch-on loss

■ Frequency reduction at low power output for low standby power: <100 mW

■ Adjustable overcurrent protection

■ Undervoltage protection

■ Temperature protection

■ Short winding protection

■ Safe restart mode for system fault conditions

■ Simple application with both primary and secondary (opto) feedback

■ Available in 8-pin and 16-pin DIP package.

3. Applications

■ Adapters ■ VCD

■ Set-Top Box (STB) ■ CD(R)

■ DVD ■ PC Silverbox standby SMPS.

Philips Semiconductors

4. Quick reference data

Table 1: Quick reference data

Symbol Parameter Conditions Min Typ Max Unit

CC(max)

DRAIN(max)

DRAIN

DSon

osc

amb

5. Ordering information

TEA1623P; TEA1623PH

STARplug

maximum supply voltage - - 40 V maximum voltage at pin

DRAIN supply current drawn from

pin DRAIN drain-source on-state

resistance

oscillator frequency range 10 - 200 kHz ambient temperature −20 - +85 °C

Tj>0°C - - 650 V

no auxiliary supply - 0.5 - mA

SOURCE

= −0.5 A

=25°C - 6.5 7.5 Ω

= 100 °C - 9.0 10.0 Ω

Table 2: Ordering information

Type number Package

Name Description Version

TEA1623P DIP8 plastic dual in-line package; 8 leads (300 mil) SOT97-1 TEA1623PH DIP16 plastic dual in-line package; 16 leads (300 mil);

SOT38-1

long body

Product data sheet Rev. 01 — 17 March 2004 2 of 18

Philips Semiconductors

6. Block diagram

TEA1623P; TEA1623PH

STARplug

GND

REG

stop

OSCILLATOR

low frequency

2.5 V

1.8 U

10x

TEA1623P

PWM

THERMAL

SHUTDOWN

POWER-UP

RESET

SUPPLY

LOGIC

PROTECTION

LOGIC

overcurrent

short winding

VALLEY

blank

100 mV

0.5 V

DRAIN

n.c.

SOURCE

AUX

0.75 V

col011

Fig 1. Block diagram of TEA1623P.

Product data sheet Rev. 01 — 17 March 2004 3 of 18

Philips Semiconductors

TEA1623P; TEA1623PH

STARplug

GND

REG

SGND

stop

OSCILLATOR

low frequency

2.5 V

1.8 U

10x

TEA1623PH

PWM

THERMAL

SHUTDOWN

POWER-UP

RESET

SUPPLY

LOGIC

PROTECTION

LOGIC

overcurrent

short winding

VALLEY

blank

0.75 V

100 mV

0.5 V

1, 2, 7, 9,

10, 13,

15, 16

DRAIN

n.c.

SOURCE

AUX

col013

Fig 2. Block diagram of TEA1623PH.

7. Pinning information

7.1 Pinning

n.c. n.c.

GND n.c.

2 3 4

TEA1623P

001aaa310

RC SOURCE

REG AUX

8 7 6 5

DRAIN

GND n.c.

RC SOURCE

REG AUX

n.c. n.c.

SGND n.c.

TEA1623PH

5 6 7 8

001aaa312

a. DIP8 package. b. DIP16 package.

Fig 3. Pin conﬁguration.

Product data sheet Rev. 01 — 17 March 2004 4 of 18

16 15 14 13 12 11 10

DRAIN

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7.2 Pin description

Table 3: Pin description

Symbol Pin Description

GND 2 4 ground RC 3 5 frequency setting REG 4 6 regulation input SGND - 8 signal ground; must preferably be connected to pin GND AUX 5 11 input for voltage from auxiliary winding for timing

SOURCE 6 12 source of internal MOS switch n.c. 7 1,2, 7, 9, 10,

DRAIN 8 14 drain of internal MOS switch; input for start-up current

TEA1623P; TEA1623PH

TEA1623P TEA1623PH

1 3 supply voltage

(demagnetization)

not connected

13, 15, 16

and valley sensing

STARplug

8. Functional description

The TEA1623P; TEA1623PH is the heart of a compact ﬂyback converter, with the IC placed at the primary side. The auxiliary winding of the transformer can be used for indirect feedbackto control the isolated output. This additional winding also powers the IC. A more accurate control of the output voltage and/or current can be implemented with an additional secondary sensing circuit and optocoupler feedback.

The TEA1623P; TEA1623PH uses voltage mode control. The frequency is determined by the maximum transformer demagnetizing time and the time of the oscillator. In the ﬁrst case, the converter operates in the Self Oscillating Power Supply (SOPS) mode. In the latter case, it operates at a constant frequency, which can be adjusted with external components RRC and CRC. This mode is called Pulse Width Modulation (PWM). Furthermore, a primary stroke is started only in a valley of the secondary ringing. This valley switching principle minimizes capacitive switch-on losses.

8.1 Start-up and undervoltage lock-out

Initially, the IC is self supplying from the rectiﬁed mains voltage. The IC starts switching as soon as the voltage on pin VCCpasses the V auxiliary winding of the transformer as soon as VCC is high enough and the supply from the line is stopped for high efﬁciency operation.

As soon as the voltage on pin VCC drops below the V and restarts from the rectiﬁed mains voltage.

CC(start)

level. The supply is taken over by the

level, the IC stops switching

CC(stop)

8.2 Oscillator

The frequency of the oscillator is set by the external resistor and capacitor on pin RC. The external capacitor is charged rapidly to the V stroke, it discharges to the V

level. Because the discharge is exponential, the

RC(min)

RC(max)

relative sensitivity of the duty factor to the regulation voltage at low duty factor is almost

Product data sheet Rev. 01 — 17 March 2004 5 of 18

leveland, starting from a new primary

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