поискавой системы для электроныых деталей |
|
SiC533CD-T1-GE3 датащи(PDF) 5 Page - Vishay Siliconix |
|
SiC533CD-T1-GE3 датащи(HTML) 5 Page - Vishay Siliconix |
5 / 17 page SiC533 www.vishay.com Vishay Siliconix S16-2309-Rev. A, 14-Nov-16 5 Document Number: 75010 For technical questions, contact: powerictechsupport@vishay.com 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 DETAILED OPERATIONAL DESCRIPTION PWM Input with Tri-state Function The PWM input receives the PWM control signal from the VR controller IC. The PWM input is designed to be compatible with standard controllers using two state logic (H and L) and advanced controllers that incorporate tri-state logic (H, L and tri-state) on the PWM output. For two state logic, the PWM input operates as follows. When PWM is driven above VPWM_TH_R the low-side is turned OFF and the high-side is turned ON. When PWM input is driven below VPWM_TH_F the high-side is turned OFF and the low-side is turned ON. For tri-state logic, the PWM input operates as previously stated for driving the MOSFETs when PWM is logic high and logic low. However, there is a third state that is entered as the PWM output of tri-state compatible controller enters its high impedance state during shut-down. The high impedance state of the controller’s PWM output allows the SiC533 to pull the PWM input into the tri-state region (see definition of PWM logic and tri-state, fig. 4). If the PWM input stays in this region for the tri-state hold-off period, tTSHO, both high-side and low-side MOSFETs are turned OFF. The function allows the VR phase to be disabled without negative output voltage swing caused by inductor ringing and saves a Schottky diode clamp. The PWM and tri-state regions are separated by hysteresis to prevent false triggering. The SiC533 incorporates PWM voltage thresholds that are compatible with 5 V logic. Diode Emulation Mode and PS4 Mode (ZCD_EN#) The ZCD_EN# pin enables or disables diode emulation mode. When ZCD_EN# is driven below VTH_ZCD_EN#_F, diode emulation is allowed. When ZCD_EN# is driven above VTH_ZCD_EN#_R, continuous conduction mode is forced. Diode emulation mode allows for higher converter efficiency under light load situations. With diode emulation active, the SiC533 will detect the zero current crossing of the output inductor and turn off the low-side MOSFET. This ensures that discontinuous conduction mode (DCM) is achieved. Diode emulation is asynchronous to the PWM signal, therefore, the SiC533 will respond to the ZCD_EN# input immediately after it changes state. The ZCD_EN# pin can be floated resulting in a high impedance state. High impedance on the input of ZCD_EN# combined with a tri-stated PWM output will shut down the SiC533, reducing current consumption to typically 5 μA. This is an important feature in achieving the low standby current requirements required in the PS4 state in ultrabooks and notebooks. Voltage Input (VIN) This is the power input to the drain of the high-side power MOSFET. This pin is connected to the high power intermediate BUS rail. Switch Node (VSWH and PHASE) The switch node, VSWH, is the circuit power stage output. This is the output applied to the power inductor and output filter to deliver the output for the buck converter. The PHASE pin is internally connected to the switch node, VSWH. This pin is to be used exclusively as the return pin for the BOOT capacitor. Ground Connections (CGND and PGND) PGND (power ground) should be externally connected to CGND (control signal ground). The layout of the printed circuit board should be such that the inductance separating CGND and PGND is minimized. Transient differences due to inductance effects between these two pins should not exceed 0.5 V. Control and Drive Supply Voltage Input (VDRV, VCIN) VCIN is the bias supply for the gate drive control IC. VDRV is the bias supply for the gate drivers. It is recommended to separate these pins through a resistor. This creates a low pass filtering effect to avoid coupling of high frequency gate drive noise into the IC. Bootstrap Circuit (BOOT) The internal bootstrap diode and an external bootstrap capacitor form a charge pump that supplies voltage to the BOOT pin. An integrated bootstrap diode is incorporated so that only an external capacitor is necessary to complete the bootstrap circuit. Connect a boot strap capacitor with one leg tied to BOOT pin and the other tied to PHASE pin. Shoot-Through Protection and Adaptive Dead Time The SiC533 has an internal adaptive logic to avoid shoot through and optimize dead time. The shoot through protection ensures that both high-side and low-side MOSFETs are not turned ON at the same time. The adaptive dead time control operates as follows. The high-side and low-side gate voltages are monitored to prevent the MOSFET turning ON from tuning ON until the other MOSFET’s gate voltage is sufficiently low (< 1 V). Built in delays also ensure that one power MOSFET is completely OFF, before the other can be turned ON. This feature helps to adjust dead time as gate transitions change with respect to output current and temperature. Under Voltage Lockout (UVLO) During the start up cycle, the UVLO disables the gate drive, holding high-side and low-side MOSFET gates low, until the supply voltage rail has reached a point at which the logic circuitry can be safely activated. The SiC533 also incorporates logic to clamp the gate drive signals to zero when the UVLO falling edge triggers the shutdown of the device. |
Аналогичный номер детали - SiC533CD-T1-GE3 |
|
Аналогичное описание - SiC533CD-T1-GE3 |
|
|
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 |