Electronic Components Datasheet Search |
|
ISL6571 Datasheet(PDF) 7 Page - Intersil Corporation |
|
ISL6571 Datasheet(HTML) 7 Page - Intersil Corporation |
7 / 11 page 7 FN9082.4 Functional Pin Descriptions VCC (Pin 54) Provide a 12V bias supply for the driver IC to this pin. The voltage at this pin is monitored for Power-On Reset (POR) purposes. PVCC (Pin 56) Provide a well decoupled 5V to 10V bias supply at this pin. The voltage at this pin is used to bias the gates of the MOSFET switches. GND (Pins 46, 50, 57, 71) Ground pins for the driver IC. Connect these pins to the circuit ground (plane) and to the PGND pins using the shortest available paths. PGND (Pins 60-68) This is the source ground connection for the lower MOSFET switches. Connect these pins to the circuit ground (plane) and to the GND pins using the shortest available paths. VIN (Pins 29-44, 70) Connect these pins to the input voltage to be converted down. Provide bulk and high-frequency decoupling capacitors as close to these pins as feasible. PHASE (Pins 1-17, 27, 45, 59, 69) As a minimum, connect pin 69 to the output inductor. The remainder of the PHASE pins may be tied to pin 69, left open, or used for other connections. It is recommended pin 45 is connected to the bootstrap capacitor, CBOOT. BOOT (Pin 47) This pin is connected to the PVCC pin through an internal quasi-diode. Connect a bootstrap capacitor from this pin to PHASE pin 45 (0.1 µF recommended). This capacitor provides the bias for the upper MOSFET drive and the gate charge for the upper MOSFET. LGATE (Pin 53) This pin is the output of the lower MOSFET drive. Connect this pin to LGATE1 pin using the shortest available path. LGATE1 (Pin 58) This pin is connected to the gate of the lower MOSFET switch. Connect this pin to LGATE pin using the shortest available path. PWM (Pin 48) Connect this pin to the regulating controller’s PWM output. Left open, this input will float to approximately 2.5V and cause both MOSFET switches to be turned off. Applying 5V to this input causes the upper MOSFET switch to be turned on. A 0V applied to this input causes the lower MOSFET switch to be turned on. The approximate input impedance of this pin is 5k Ω. NC (Pins 18-26, 28, 49, 51, 52, 55) These pins are not internally connected. Description Bias Requirements The on-board driver includes a Power-On Reset (POR) function, which continually monitors the input bias supply. The POR monitors the bias voltage (+12VIN) at the VCC pin, and enables the ISL6571 for operation immediately after it exceeds the rising threshold. Upon the bias voltage’s drop below the falling threshold, the IC is disabled and both internal MOSFETs are turned off. The output drivers are powered from the PVCC pin. For proper functionality and driving capability, connect PVCC to FIGURE 10. ISL6571 EFFICIENCY AT 200kHz, 300kHz, 500kHz, 750kHz Typical Performance Curves/Setup (Continued) OUTPUT CURRENT (A) 0 4.5 7.5 10.5 12.0 6.0 79 83 87 9.0 1.5 3.0 89 85 81 77 75 73 13.5 15.0 16.5 91 93 750kHz 500kHz 300kHz 200kHz ISL6571 |
Similar Part No. - ISL6571 |
|
Similar Description - ISL6571 |
|
|
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 |