L6599DTR STMicroelectronics, L6599DTR Datasheet - Page 30

• Manufacturer Part Number: L6599DTR
• Description: IC RESONANT CONVRTR CTRLR 16SOIC
• Manufacturer: STMicroelectronics
• Type: Phase Shift Resonant Controllerr

Specifications of L6599DTR

• Applications: Resonant Converter Controller
• Voltage - Supply: 8.85 V ~ 16 V
• Current - Supply: 3.5mA
• Operating Temperature: 0°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Number Of Outputs: Single Output
• Output Current: 800 mA
• Switching Frequency: 500 KHz
• Operating Supply Voltage: 8.85 V to 16 V
• Maximum Operating Temperature: + 150 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• For Use With: 497-10542 - BOARD EVAL BASED ON L6599497-8429 - BOARD ADAPTER L6599/STP12NM50N497-8265 - BOARD EVAL BASED ON L6599497-5857 - DEMO BOARD FOR L6599497-5856 - DEMO BOARD FOR L6599497-5497 - EVAL BOARD FOR L6599497-5496 - EVAL BOARD FOR L6599
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Input: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-6156-2

Application information
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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