EVAL6599-90W STMicroelectronics, EVAL6599-90W Datasheet - Page 30

• Manufacturer Part Number: EVAL6599-90W
• Description: EVAL BOARD FOR L6599
• Manufacturer: STMicroelectronics
• Type: Power Factor Correctionr

Specifications of EVAL6599-90W

• Main Purpose: AC/DC, Primary Side and PFC
• Outputs And Type: 1, Isolated
• Power - Output: 90W
• Voltage - Output: 19V
• Current - Output: 4.7A
• Voltage - Input: 90 ~ 264VAC
• Regulator Topology: Resonant
• Frequency - Switching: 90kHz
• Board Type: Fully Populated
• Utilized Ic / Part: L6563, L6599
• Input Voltage: 90 V to 264 V
• Output Voltage: 19 V
• Dimensions: 78 mm x 174 mm
• Product: Power Management Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: L6599
• Other names: 497-5497

Application information
30/36
This concern applies to converters designed with a high resonance frequency (indicatively,
> 150 kHz), so that they run at high frequency also at full load. Otherwise, the converter will
run at high frequency only at light load, where the current flowing in the MOSFETs of the
half-bridge leg is lower, so that, generally, an R
to check this point anyway and the following equation is useful to compute the drop on the
bootstrap driver:
where Q
bootstrap DMOS (150, typ.) and T
about half the switching period minus the dead time T
a total gate charge of 30 nC, the drop on the bootstrap driver is about 3 V at a switching
frequency of 200 kHz:
If a significant drop on the bootstrap driver is an issue, an external ultra-fast diode can be
used, thus saving the drop on the R
g
is the gate charge of the external power MOS, R
V
Drop
V
Drop
=
I
=
Ch
------------------------------------------------------ - 150
2.5 10
arg
charge
e
⋅
DS(on)
r
(
DS
30 10
–
)ON
is the ON-time of the bootstrap driver, which equals
6
⋅
–
of the internal DMOS.
0.3 10
+
–
9
V
⋅
DS(on)
F
=
–
------------------- - R
T
6
Ch
Q
rise is not an issue. However, it is wise
D
arg
g
. For example, using a MOSFET with
+
e
0.6
DS(on)
(
DS
=
)ON
2.7V
+
is the on-resistance of the
V
F
L6599