ISL6551EVAL1 Intersil, ISL6551EVAL1 Datasheet - Page 44

• Manufacturer Part Number: ISL6551EVAL1
• Description: EVALUATION BOARD ISL6551
• Manufacturer: Intersil

Specifications of ISL6551EVAL1

• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Isolated
• Voltage - Output: 3.3V
• Current - Output: 60A
• Voltage - Input: 36 ~ 75V
• Regulator Topology: Buck
• Frequency - Switching: 470kHz
• Board Type: Fully Populated
• Utilized Ic / Part: ISL6551
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -

Iindpeak
Dmaxav
dVincap
Hopen2
Iindrms
dV
dV
Hopen
ESRin
Fclock
F
Iinrms
dV
Coss
∆V
Imag
∆V
ESR
ESL
I
I
dVtr
Fsw
Cin
I
dIo
E
DIST
LO1
LO2
Co
Cp
E
He
Hd
Hs
Idr
LO
D
dI
f
ESR
ESL
c
C
Co
L
CAP
ESL
Input Capacitance
Output Capacitance
Output Capacitance of MOSFET
Primary Capacitance of Transformer
Ratio of On-Time Interval of Lower FET to One
Clock Period (1/Fclock), Duty Cycle
Ripple Current thru Each Output Inductor
Overall Ripple Current thru Output Capacitors
Maximum Available Duty Cycle
Output Ripple Voltage due to Output Capacitance
Ripple Voltage Contributed by ESL of Output
Capacitance
Ripple Voltage Contributed by ESR of Output
Capacitors
Allowable Input Ripple Voltage Contributed by the
Input Capacitors
Output Transient at 25% Step Load
Transient due to Output Capacitance
Initial Transient Spike due to ESL
Energy Stored in Primary Parasitic Capacitance
Energy Stored in Commutating Inductance
Overall ESR of Output Capacitors
Overall ESR of Input Capacitors
Overall ESL of Output Capacitors
System Closed-Loop Bandwidth
Internal Clock Frequency
Current Distribution Factor thru Synchronous FETs
Switching Frequency
Transfer Function of Error Amplifier
Transfer Function of Differential Amplifier
Open Loop Transfer Function for Simplified Model
Open Loop Transfer Function with Subharmonic
and Ramp Components Added
High-frequency Correction Term for Subharmonic
Phenomenon
Driver Current
Peak Current thru Each Output Inductor
RMS Current thru Each Output Inductor
RMS Current thru Input Capacitors
Overall Ripple Current thru Output Inductors
Ripple Current thru Inductor Lo1
Ripple Current thru Inductor Lo2
Magnetizing Current
TERM DEFINITIONS
44
Application Note 1002
Isyndeadavg Average Current thru Body Diode of Synchronous
Ipriavgres
Isynrmstr
Isynrmsfr
Ppriswon
Isynpeak
Iprirmsfr
Iprirmstr
Ipriavgfr
Ipripeak
Isynrms
Plowfet
Iprirms
Isrmstr
Isrmsfr
Nmax
Iorms
Iprms
Isrms
Lmag
Istep
Lext
Ncs
IQ1
IQ2
Pdr
Ion
Lo
Lk
Io
Ip
Is
N
Output Load Current
Current at Turn-on
RMS Current thru Output Capacitors
Current thru Primary Winding
Average Current thru Body Diode of Upper FET in
Freewheeling Period
Average Current thru Body Diode of Lower FET for
a Td turn-on delay longer than Required Resonant
Delay
Peak Current thru Primary Winding /Power Switches
RMS Current thru the Channel of Upper FET in
Freewheeling Period
RSM Current thru Primary Switches in Power
Transfer Period
Overall RMS Current thru Upper FET
Overall RMS Current thru Primary Winding
Current thru One Synchronous Leg, Q1
Current thru Another Synchronous Leg, Q2
Current thru Secondary Winding
RMS Current thru Secondary Winding in Transfer
Period
RMS Current thru Secondary Winding in
Freewheeling Period
Overall RMS Current thru Secondary Winding
Transient Load Step
FETs/External Schottky in SYNC DRIVE Scheme in
Dead Time
Peak Current thru Synchronous FET
Overall RMS Current thru Synchronous FETs
RMS Current thru Synchronous FETs in Power
Transfer Period
RMS Current thru Synchronous FETs in Clamped
Freewheeling Period
External Commutating Inductance
Leakage Inductance
Magnetizing Inductance
Inductance of Each Output Inductor
Main Transformer Turns Ratio (Np/Ns)
Current Sense Transformer Turns Ratio
Maximum Allowable Turns Ratio of Main
Transformer
Driver Switching Losses
Power Dissipation of Lower FET
Switching Losses of Primary Switches at Turn-on
TERM DEFINITIONS (Continued)