Electronic Components Datasheet Search |
|
STV9381 Datasheet(PDF) 2 Page - STMicroelectronics |
|
STV9381 Datasheet(HTML) 2 Page - STMicroelectronics |
2 / 8 page STV9381 2/8 1 PIN FUNCTIONS 2 FUNCTIONAL DESCRIPTION The STV9381 is a vertical deflection circuit operating in class D. The class D is a modulation method where the output transistors work in switching mode at high frequency. The output signal is restored by fil- tering the output square wave with an external LC filter. The major interest of this IC is the low power dis- sipation comparatively to traditional amplifiers operating in class AB, eliminating the need of an heatsink. Except for the output stage which uses the class D modulation, the circuit operation is similar to the one of a traditional linear vertical amplifier. A reference signal (sawtooth) has to be applied to the circuit which can accept a differential or single end- ed signal. This sawtooth is amplified and applied as a current to the deflection yoke. This current is meas- ured by means of a low value resistor. The resulting voltage is used as a feed-back signal to guarantee the conformity of the yoke current with the reference input signal. The overvoltage necessary for a fast retrace is obtained with a chemical capacitor charged at the power supply voltage of the circuit. At the flyback moment this capacitor is connected in series with the output stage power supply. This method, used for several years with the linear vertical boosters and called “in- ternal flyback” or “flyback generator”, avoids the need of an additional power supply, while reducing the flyback duration. The circuit uses a BCD process that combines Bipolar, CMOS and DMOS devices. DMOS transistors are used in the output stage due to the absence of second breakdown. Pin Number Name Function 1-VCC Negative supply 2-VCC Negative supply 3-VCC Negative supply 4 OUT PWM Output 5 CFLY+ Flyback capacitor 6 CFLY- Flyback capacitor 7 BOOT Bootstrap capacitor 8 VREG Internal voltage regulator 9 FEEDCAP Feed-back integrating capacitor 10 FREQ Frequency setting resistor 11 SGND Signal Ground 12 IN- Error amplifier inverting input 13 IN+ Error amplifier non-inverting input 14 EA out Error amplifier output 15 +VCC Positive supply 16 +VCCPOW Positive Power supply 17 -VccPOW Negative Power supply 18 -VCC Negative supply 19 -VCC Negative supply 20 -VCC Negative supply 2 |
Similar Part No. - STV9381 |
|
Similar Description - STV9381 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |