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PDF STR2A153 Data sheet ( Hoja de datos )
| Número de pieza | STR2A153 | |
| Descripción | power IC | |
| Fabricantes | Sanken | |
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STR2A100 SERIES APPLICATION NOTE
STR2A100 Series
Application Note (Rev.0.3)
Rev. 0.3
The contents in this application note are preliminary,
and are subject to changes without notice.
SANKEN ELECTRIC CO., LTD.
http://www.sanken-ele.co.jp
Copy Right: SANKEN ELECTRIC CO., LTD.
Page.1
1 page  
STR2A100 SERIES APPLICATION NOTE
4. Package Information
• DIP8 package
a
SK b
c
Rev. 0.3
Material of terminal: Cu
Treatment of terminal: solder plating
Weight: Approx. 0.51g
Unit: mm
a. Type Number : 2AXXX
b. Lot Number
1st letter : The last digit of year
2nd letter : Month
1 to 9 for Jan. to Sept.
O for Oct.
N for Nov.
D for Dec.
3rd letter : Week
1st～10th : 1
11th～20th : 2
21st～31st : 3
c. Sanken Registration Number
Copy Right: SANKEN ELECTRIC CO., LTD.
Page.5
5 Page 
STR2A100 SERIES APPLICATION NOTE
Rev. 0.3
7.2 Constant Output Voltage Control
The constant output voltage control of the power supply uses
the current-mode control method (the peak current-mode),
STR2A100
which enhances response speed and provides stable operation.
When load conditions become smaller, the output voltage,
VOUT, rises, and a feedback current from an error amplifier on
the secondary side also rises. This current corresponded to the
S/OCP GND FB/OLP
1 3 4 PC1
ROCP
VR1
C3
IFB
feedback current is sunk by a photo-coupler at FB/OLP
terminal as shown in figure 7-8, and thus FB/OLP terminal
Figure 7-8 FB/OLP peripheral circuit
voltage decreases.
This voltage is fed to Feedback Control block in “3.
Functional Block Diagram and Terminal List” section, and
is added the slope compensation signal to create the target
voltage, VSC, in figure 7-9. VSC is fed to the negative input
of FB comparator.
Target voltage added slope
compensation signal
- VSC
The peak detection signal, VR1, converted from Drain
current, ID, with ROCP is fed to the positive input of FB
comparator.
The control circuit performs to decrease the peak current of
+ VR1
FB comparator
S/OCP terminal voltage
(Both sides voltage of ROCP)
ID so that VR1 comes close to VSC.
And this control prevents the output voltage from in-
Drain current
ID
creasing.
Figure 7-9 Drain current, ID, and FB comparator
in steady operation
When load conditions become bigger, the control circuit per-
forms reverse operations to the former, and increases the peak
current of ID so that VR1 comes close to VSC.
And this control prevents the output voltage from decreasing.
Target voltage
without slope compensation
Generally, in the current-mode control method, some sub-
harmonic oscillations shown in figure 7-10 occur theoretically.
It is called the subharmonic phenomenon.
ID
When the drain current waveform becomes a trapezoid in con-
tinuous operating mode, the ON-duty cycle can not become
tON1
tON2
stable in each cycle, and thus subharmonic oscillations occur in
Cycle
Cycle Cycle
multiples of the fundamental operating frequency, according to
the initial value of drain current, even if the peak current level
set by the target voltage is constant.
Figure 7-10 Drain current waveform
in subharmonic oscillation
In order to avoid this, the IC incorporates Slope Compensation Function.
Because the target voltage, VSC, in figure 7-9 is added the down-slope compensation signal, the wider the
ON-duty cycle becomes, the smaller the peak drain current becomes to suppress subharmonic oscillations..
Even if subharmonic oscillations occur when the IC has some excess supply being out of feedback control, such
as during startup and load shorted, this does not affect performance during normal operation.
In the current-mode control method, FB comparator and/or OCP comparator may respond to the surge voltage
resulting from the drain surge current in turning on a power MOSFET, and may turn off the power MOSFET
irregularly.
Leading Edge Blanking, tBW= 350ns(TYP), is built-in to prevent OCP comparator from malfunction caused by
surge voltage in turning on the power MOSFET.
Copy Right: SANKEN ELECTRIC CO., LTD.
Page.11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet STR2A153.PDF ] | |
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