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参数资料
| 型号： | L6599TR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 0.8 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | LEAD FREE, SOP-16 |
| 文件页数： | 24/36页 |
| 文件大小： | 633K |
| 代理商： | L6599TR |
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Application information
L6599
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(DS)ON rise is not an issue. However, it is wise
to check this point anyway and the following equation is useful to compute the drop on the
bootstrap driver:
where Qg is the gate charge of the external power MOS, r(DS)ON is the on-resistance of the
bootstrap DMOS (150 , typ.) and Tcharge is the ON-time of the bootstrap driver, which
equals about half the switching period minus the dead time TD. For example, using a
MOSFET with a total gate charge of 30nC, the drop on the bootstrap driver is about 3V at a
switching frequency of 200kHz:
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(DS)ON of the internal DMOS.
V
Drop
I
Ch
e
arg r DS
()ON
V
F
Q
g
T
Ch
e
arg
--------------------R
DS
()ON
V
F
+
=
+
=
V
Drop
30
10
9
–
2.5
10
6
–
0.3
10
6
–
–
-------------------------------------------------------------150
0.6
2.7V
=
+
=
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