1
Application Note 1876
Author: Alan Yu
ISL6730BEVAL1Z and ISL6730DEVAL1Z: Boost CCM
PFC for 300W Universal Input Adaptors
Introduction
This application note describes the design and implementation
of a 390V, 300W, Continuous Conduction Mode (CCM) Boost
PFC converter using the ISL6730B, ISL6730D. The converter
exhibits high power factor, Low THD and high conversion
efficiency. The ISL6730B, ISL6730D are voltage mode power
factor correction (PFC) controllers designed to drive
cost-effective converters to meet input line harmonic
regulations. The IC can be ISL6730B (Fixed Skip threshold) or
ISL6730D (non-Skip). A detailed design procedure can be found
in the datasheet (FN8258
).
Application
The pre-regulator for AC/DC adaptors, such as Desktop/laptop
Computer adaptors, or ATX power supply for the servers of
networks or date centers, brick converters for telecom,
flat-panel TVs, etc.
Design Specifications
•Input Voltage, V
IN
: 85V - 265V
AC
•Output Voltage, V
O
: 390V
DC
• Output Current, I
O
: 0.77A (300W)
• Switching Frequency: 64kHz
• Efficiency: Full Load, 96% @ 115V
AC
; 98% @ 230V
• PF: Full Load, 0.999 @ 115V
AC
;0.996 @ 230V
AC
• THD: Full Load, 2% @ 115V
AC
, 2.5% @ 230V
AC
• Board Dimension: 124×92×43 mm
3
(L×W×H)
Figure 3 on page 2 shows the test setup.
+
ISL6730
VCC
ISEN
ICOMP
VIN
GATE
GND
FB
BO VREG
COMP
V
LINE
V
OUT
V
I
FIGURE 1. SIMPLIFIED SCHEMATIC
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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July 29, 2013
AN1876.0
