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Q67000-A9230 데이터시트(PDF) 24 Page - Siemens Semiconductor Group

부품명 Q67000-A9230
부품 상세설명  SMPS-IC with MOSFET Driver Output
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제조업체  SIEMENS [Siemens Semiconductor Group]
홈페이지  http://www.siemens.com/
Logo SIEMENS - Siemens Semiconductor Group

Q67000-A9230 데이터시트(HTML) 24 Page - Siemens Semiconductor Group

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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 RGND is Connected to Input CT.
1. General remarks
Duty cycle
ν = ON time/period
Time
t = C
T VCT/ICT
V
CT = approx. 0.6 V
Current
I
RGND = 2.2 V/RGND
Current
I
RT = 2.5 V/RT
Current
I
RVS = (12 V − 2.2 V)/RVS
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
T
0.6 V
I
RT
I
RVS
------------------------------
C
T
0.6 V
I
RT
I
RVS
------------------------------
C
T
0.6 V
I
RT
I
RVS
+
------------------------------
+
--------------------------------------------------------------------
=
ν
max
C
T
0.6 V
I
RT
I
RGND
+
------------------------------------
C
T
0.6 V
I
RT
I
RGND
+
------------------------------------
C
T
0.6 V
I
RT
I
RGND
------------------------------------
+
-------------------------------------------------------------------------------
=


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