參數(shù)資料
型號(hào)： TDA4916GG
廠商： SIEMENS A G
元件分類： 穩(wěn)壓器
英文描述： SMPS-IC with MOSFET Driver Output
中文描述： SWITCHING CONTROLLER, PDSO24
文件頁數(shù)： 24/27頁
文件大小： 918K
代理商： TDA4916GG
TDA 4916 GG
Semiconductor Group
24
05.96
Instructions for the Approximate Calculation of the Maximum Duty Cycle of the FG
when
R
VS
or
R
GND
is Connected to Input
C
T
.
1. General remarks
Duty cycle
ν
= ON time/period
Time
t
=
C
T
V
CT
/
I
CT
V
CT
= approx. 0.6 V
Current
I
RGND
= 2.2 V/
R
GND
Current
I
RT
= 2.5 V/
R
T
Current
I
RVS
= (12 V
2.2 V)/
R
VS
Mean value
V
CT Mean
= approx. 2.2 V
To facilitate better general understanding, the equations are not abbreviated in the
following.
The wanted quantity can be isolated using the rules of arithmetic.
2. Calculation for connection of
R
VS
(
ν
> 0.5)
3. Calculation for connection of
R
GND
(
ν
< 0.5)
ν
max
C
0.6 V
I
I
–
-----------------------------
C
0.6 V
I
RT
I
RVS
–
-----------------------------
C
0.6 V
I
RT
+
I
RVS
------------------------------
+
-------------------------------------------------------------------
=
ν
max
C
0.6 V
I
+
I
C
0.6 V
I
RT
–
------------------------------------
C
0.6 V
I
RT
+
I
RGND
------------------------------------
I
RGND
-----------------------------------
+
-------------------------------------------------------------------------------
=
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