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| 型号： | L6598D013TR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 400 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | SO-16 |
| 文件页数： | 24/24页 |
| 文件大小： | 359K |
| 代理商： | L6598D013TR |
L6598
Block diagram description
Doc ID 6554 Rev 7
9/24
5
Block diagram description
5.1
High/low side driving section
An high and low side driving section provide the proper driving to the external power MOS or
IGBT. An high sink/source driving current (450/250 mA typ) ensure fast switching times also
when size for power MOS are used. The internal logic ensures a minimum dead time to
avoid cross-conduction of the power devices.
5.2
Timing and oscillator section
The device is provided of a soft start function. It consists in a period of time, TSS, in which
the switching frequency shifts from fstart to fmin. This feature is explained in the following
description (ref. fig.7 and fig.8).
Figure 6.
Soft start and frequency shifting block
During the soft start time the current ISS charges the capacitor CSS, generating a voltage
ramp which is delivered to a transconductance amplifier, as shown in fig. 7. Thus this
voltage signal is converted in a growing current which is subtracted to Ifstart. Therefore the
current which drives the oscillator to set the frequency during the soft start is equal to:
Equation 1
Equation 2
I
osc
I
fmin
I
fstart
g
mVCss t
()
–
()
+
I
fmin
I
fstart
g
mIss
C
ss
--------------
–
+
==
where
I
fmin
V
REF
R
fmin
-------------- I
fstart
V
REF
R
fstart
---------------- V
REF
2V
=
,
=
,
=
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