поискавой системы для электроныых деталей |
|
SIC414 датащи(PDF) 9 Page - Vishay Siliconix |
|
SIC414 датащи(HTML) 9 Page - Vishay Siliconix |
9 / 24 page Vishay Siliconix SiC414, SiC424 Document Number: 63388 S13-0248-Rev. B, 04-Feb-13 www.vishay.com 9 This document is subject to change without notice. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 For technical questions, contact: powerictechsupport@vishay.com ELECTRICAL CHARACTERISTICS APPLICATIONS INFORMATION Device Overview The SiC414 and SiC424 are a step down synchronous buck DC/DC converter with integrated power FETs and programmable LDO. The device is capable of 6 A operation at very high efficiency in a tiny 4 mm x 4 mm - 28 pin package. The programmable operating frequency range of 200 kHz to 1 MHz, enables the user to optimize the solution for minimum board space and optimum efficiency. The buck controller employs pseudo-fixed frequency adaptive on-time control. This control scheme allows fast transient response thereby lowering the size of the power components used in the system. The buck controller employs pseudo-fixed frequency adaptive on-time control. This control scheme allows fast transient response thereby lowering the size of the power components used in the system. Input Voltage Range The SiC414 and SiC424 requires two input supplies for normal operation: VIN and V5V. VIN operates over the wide range from 3 V to 28 V. V5V requires a 3.3 V or 5 V supply input that can be an external source or the internal LDO configured to supply 5 V. Pseudo-Fixed Frequency Adaptive On-Time Control The PWM control method used by the SiC414 and SiC424 is pseudo-fixed frequency, adaptive on-time, as shown in figure 1. The ripple voltage generated at the output capacitor ESR is used as a PWM ramp signal. This ripple is used to trigger the on-time of the controller. The adaptive on-time is determined by an internal one-shot timer. When the one-shot is triggered by the output ripple, the device sends a single on-time pulse to the high side MOSFET. The pulse period is determined by VOUT and VIN; the period is proportional to output voltage and inversely proportional to input voltage. With this adaptive on-time arrangement, the device automatically anticipates the on-time needed to regulate VOUT for the present VIN condition and at the selected frequency. The adaptive on-time control has significant advantages over traditional control methods used in the controllers today. • Reduced component count by eliminating DCR sense or current sense resistor as no need of a sensing inductor current. • Reduced saves external components used for compensation by eliminating the no error amplifier and other components. • Ultra fast transient response because of fast loop, absence of error amplifier speeds up the transient response. • Predictable frequency spread because of constant on-time architecture. • Fast transient response enables operation with minimum output capacitance Overall, superior performance compared to fixed frequency architectures. Overall, superior performance compared to fixed frequency architectures. Start-up with VIN Ramping up (VIN = 12 V, VOUT = 1 V, FSW = 500 kHz) Over-Current Protection (VIN = 12 V, VOUT = 1 V, FSW = 500 kHz) Figure 1 - PWM Control Method, VOUT Ripple VIN CIN VLX Q1 Q2 L ESR + FB VLX tON VFB COUT VOUT FB threshold |
Аналогичный номер детали - SIC414 |
|
Аналогичное описание - SIC414 |
|
|
ссылки URL |
Конфиденциальность |
ALLDATASHEETRU.COM |
Вашему бизинису помогли Аллдатащит? [ DONATE ] |
Что такое Аллдатащит | реклама | контакт | Конфиденциальность | обмен ссыками | поиск по производителю 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 |