SC420A
POWER MANAGEMENT
Applications Information (Cont.)
Timing Waveforms measured in a system
The following waveforms were noted using a 3-phase SC2647 Combi-Sense™ PWM controller system. Typical operating
conditions for this system are
Input Voltage, Vin = 10 – 25V
Output Current, Iout = 0 – 52A
Output Voltage, Vout = 0.8 – 1.85V
Timing Diagram, Vin = 10V, Iout = 0, Vout = 1.45V
Timing Diagram, Vin = 10V, Iout = 10A, Vout = 1.45V
Timing Diagram, Vin = 10V, Iout = 30A, Vout = 1.45V
Timing Diagram, Vin = 10V, Iout = 20A, Vout = 1.45V
Component
Manufacturer
Series or Part Number
High Side MOSFET (each
phase)
International Rectifier
2 IRF7811AV's, total gate capacitance = 3.602 nF
Low Side MOSFET (each phase) Fairchild Semiconductor
2 FDS7066's, total gate capacitance = 9.946 nF
Series 2334Q, L= 700nH, RL~ 1mohm
SC2647
Output inductor (each phase)
Controller
Panasonic
Semtech
List of components used for above application
14
2004 Semtech Corp.
United States Patent No. 6,441,597
www.semtech.com
SEMTECH [ SEMTECH CORPORATION ]
