Teac EU-34HT, Service Manual

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High Flexibility

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Externally Programmable Reference Current

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Secondary or Primary Sensing

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High Current Totem Pole Output

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Undervoltage Lockout with Hysteresis

Safety/Protection Features

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Overvoltage Protection Facility against Open Loop

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Protection against Short Circuit on Oscillator Pin

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Fully Programmable Foldback

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Soft-Start Feature

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Accurate max Duty Cycle Setting

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Demagnetization (Zero Current Detection) Protection

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Internally Trimmed Reference

“Green Controller”

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Low Start-Up and Operating Current

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Patented Stand-by Pulsed Mode for low stand-by losses

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Low dV/dT for Low EMI radiations

PINNING

PIN VALUE

1. Output Supply Voltage (Vcc)

: 12VDC

2. Output Supply Voltage (Vc)

: 12VDC

3. Output voltage

: LOW Level Drop Voltage 1VDC, Max : 1.2VDC (Isink=100mA)

1.4VDC, Max : 2VDC (Isink=500mA)

HIGH Level Drop Voltage 1.5VDC, Max : 2VDC (Isource=200mA)

2VDC, Max : 2.7VDC (Isource=500mA)

4. Ground

5. Foldback input

: 0.9VDC, Min:-0.3VDC, Max : Vcc+0.3VDC

6. Overvoltage protection (OVP)

: 0.78VDC, Min:-0.3VDC, Max : Vcc+0.3VDC

7. Current sense input

: Min:-0.3VDC, Max : Vcc+0.3VDC

8. Demagnetization detection input

: Idemag-ib (source):-4mA Idemag-ib (sink) : 10mA

9. Standby current set

: Ipeak-stby/Iref : 0.40 Min : 0.37 Max : 0.43

10. Oscillator voltage swing

: 2Vpp

11. Soft start/Dmax/Voltage mode

: Idischarge : 5mA, Min : 1.5mA (Vsoft start=1V)

12. Clamp E/A input

: 4.7VDC, Min : 4.5VDC Max : 4.9VDC

13. E/A output

: HIGH State: 

6.5VDC, Min : 5.5VDC, Max : 7.5VDC LOW State : 1.0VDC, 1.1VDC

14. E/A input

: 2.5VDC, Min : 2.4VDC, Max : 2.6VDC

15. Stand-by management

: Stand-by On Detection current ratio : Idet/Iref : 0.38, Min : 0.34, Max : 0.42

Stand-by regulation current ratio : Ireg/Iref : 20.5, Min : 18, Max : 23

16. Rref input

: 2.5VDC, Min : 2.4VDC, Max : 2.6VDC

SDA545X:

General description:

The SDA545X is designed for a low cost mono TV-set with analogue picture and sound control. IN SDA545X the following

IC’ s are used and supported:

Non-volatile memory

: SDA 2526 or SDA2546

PLL

: SDA 3202-3, SDA 3302

IR transmitter

: SDA 2208-3 or SDA 2218

IR preamplifier

: SFH 506-32

Features:

General:

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Display of program number, channel number, TV standard, analogue values, sleep timer, parental control, and mute is done by

OSD

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Single LED for IR active, standby and on mode indication

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Local control (8 keys)

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IR remote control

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Control of volume, contrast, brightness, and saturation by analogue voltages

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Non-volatile memory for 50 or 100 programs, optimum analogue values and system parameters

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Individual delta volume for each program

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1 control line to select external source

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3 control lines for TV standard selection

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Automatic muting if no carrier detected

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Automatic switch-off when carrier disappears for more than 5 minutes

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Software protection against tube flashovers with internal watchdog timer

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Sleep timer

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Parental control

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IF 45.75 MHz or 38.9 MHz selectable

Tuning:

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Frequency synthesis tuning (62.5 kHz steps)

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192 step fine tuning

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Channels corresponding to standards

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100 programs selectable by directly entering a program number or by up/down function depending on the NVM size

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Channel selection by directly entering a channel number or by up/down function

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Channel search function in two directions