Datenblatt-Suchmaschine für elektronische Bauteile |
|
ISL1539 Datenblatt(PDF) 10 Page - Intersil Corporation |
|
ISL1539 Datenblatt(HTML) 10 Page - Intersil Corporation |
10 / 11 page ISL1539 10 Intersil products are manufactured, assembled and tested utilizing ISO9000 quality systems as noted in the quality certifications found at www.intersil.com/en/support/qualandreliability.html Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com FN7516.4 June 21, 2013 For additional products, see www.intersil.com/en/products.html where: •TJUNCT is the maximum die temperature (+150°C) •TAMB is the maximum ambient temperature •PDISS is the dissipation calculated above • θJA is the junction to ambient thermal resistance for the package when mounted on the PCB This θJA value is then used to calculate the area of copper needed on the board to dissipate the power. The IRE and QFN power packages are designed so that heat may be conducted away from the device in an efficient manner. To disperse this heat, the bottom diepad is internally connected to the mounting platform of the die. Heat flows through the diepad into the circuit board copper, then spreads and convects to air. Thus, the ground plane on the component side of the board becomes the heatsink. This has proven to be a very effective technique. θJA of +30°C/W can be achieved. Single Supply Operation The ISL1539 can also be powered from a single supply voltage. When operating in this mode, the GND pins can still be connected directly to GND. To calculate power dissipation, the equations in the previous section should be used, with VS equal to half the supply rail. Output Loading While the drive amplifiers can output in excess of 450mA transiently, the internal metallization is not designed to carry more than 75mA of steady DC current and there is no current-limit mechanism. This allows safely driving rms sinusoidal currents of 2mAx75mA, or 150mA. This current is more than that required to drive line impedances to large output levels, but output short circuits cannot be tolerated. The series output resistor will usually limit currents to safe values in the event of line shorts. Driving lines with no series resistor is a serious hazard. Power Supplies The power supplies should be well bypassed close to the ISL1539. A 3.3µF tantalum capacitor for each supply works well. Since the load currents are differential, they should not travel through the board copper and set up ground loops that can return to amplifier inputs. Due to the class AB output stage design, these currents have heavy harmonic content. If the ground terminal of the positive and negative bypass capacitors are connected to each other directly and then returned to circuit ground, no such ground loops will occur. This scheme is employed in the layout of the EL1537 demonstration board, and documentation can be obtained from the factory. Power Control Function The ISL1539 contains two forms of power control operation. Two digital inputs, C0 and C1, can be used to control the supply current of the ISL1539 drive amplifiers. As the supply current is reduced, the ISL1539 will start to exhibit slightly higher levels of distortion and the frequency response will be limited. The four power modes of the ISL1539 are set up as shown in the table1 below. TABLE 1. POWER MODES OF THE EL15371 C1 C0 Operation 00 IS Full Power Mode 0 1 3/4-IS Power Mode 1 0 1/2-IS Power Mode 11 Power Down |
Ähnliche Teilenummer - ISL1539 |
|
Ähnliche Beschreibung - ISL1539 |
|
|
Link URL |
Privatsphäre und Datenschutz |
ALLDATASHEETDE.COM |
War ALLDATASHEET hilfreich? [ DONATE ] |
Über Alldatasheet | Werbung | Kontakt | Privatsphäre und Datenschutz | Linktausch | Hersteller 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 |