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STR4A162S bảng dữ liệu(PDF) 11 Page - Sanken electric

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Giải thích chi tiết về linh kiện  Off-Line PWM Controllers with Integrated Power MOSFET
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nhà sản xuất  SANKEN [Sanken electric]
Trang chủ  http://www.sanken-ele.co.jp/en
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STR4A100 Series
STR4A100 - DSJ Rev.3.3
SANKEN ELECTRIC CO.,LTD.
11
Aug.06, 2015
http://www.sanken-ele.co.jp
© SANKEN ELECTRIC CO.,LTD. 2011
process based on actual operation in the application, so
that poor starting conditions may be avoided.
Figure 10-3 shows the VCC pin voltage behavior
during the startup period.
After the VCC pin voltage increases to VCC(ON) = 15.2
V at startup, the IC starts the operation. Then circuit
current increases and the VCC pin voltage decreases. At
the same time, the auxiliary winding voltage, VD,
increases in proportion to output voltage. These are all
balanced to produce the VCC pin voltage.
When
the
VCC
pin
voltage
is
decrease
to
VCC(OFF) = 8.1 V in startup operation, the IC stops
switching operation and a startup failure occurs.
When the output load is light at startup, the output
voltage may become more than the target voltage due to
the delay of feedback circuit. In this case, the FB pin
voltage is decreased by the feedback control. When the
FB pin voltage decreases to VFB(OFF) or less, the IC stops
switching operation and the VCC pin voltage decreases.
When the VCC pin voltage decreases to VCC(BIAS), the
Bias Assist function is activated and the startup failure is
prevented.
IC starts operation
VCC pin
voltage
VCC(ON)
VCC(BIAS)
VCC(OFF)
Startup failure
Startup success
Target operating
voltage
Time
Bias assist period
Increase with rising of
output voltage
Figure 10-3 VCC pin voltage during startup period
10.4 Soft Start Function
Figure 10-4 shows the behavior of VCC pin voltage
and drain current during the startup period.
The IC activates the soft start circuitry during the
startup period. Soft start time is fixed to around 6 ms.
during the soft start period, overcurrent threshold is
increased step-wisely (5 steps). This function reduces
the voltage and the current stress of a power MOSFET
and the secondary side rectifier diode.
Since the Leading Edge Blanking Function (refer to
Section 10.6) is deactivated during the soft start period,
there is the case that ON time is less than the Leading
Edge Blanking Time, tBW. After the soft start period,
D/ST pin current, ID, is limited by the Drain Current
Limit, IDLIM, until the output voltage increases to the
target operating voltage. This period is given as tLIM. In
case tLIM is longer than the OLP Delay Time, tOLP, the
output power is limited by the Overload Protection
(OLP) operation. Thus, it is necessary to adjust the value
of output capacitor and the turn ratio of auxiliary
winding D so that the tLIM is less than tOLP = 58 ms
(min.).
VCC(ON)
VCC(OFF)
Time
VCC pin
voltage
Startup of SMPS
Normal opertion
D/ST pin
current, ID
tLIM < tOLP (min.)
Soft start period
approximately 6 ms (fixed)
Time
Startup of IC
tSTART
IDLIM
Figure 10-4 VCC and ID behavior during startup
10.5 Constant Output Voltage Control
The IC achieves the constant voltage control of the
power supply output by using the current-mode control
method, which enhances the response speed and
provides the stable operation.
The FB/OLP pin voltage is internally added the slope
compensation at the feedback control (refer to Section
5.Block Diagram), and the target voltage, VSC, is
generated. The IC compares the voltage, VROCP, of a
current detection resistor with the target voltage, VSC, by
the internal FB comparator, and controls the peak value
of VROCP so that it gets close to VSC, as shown in Figure
10-5 and Figure 10-6.
● Light load conditions
When load conditions become lighter, the output
voltage, VOUT, increases. Thus, the feedback current
from the error amplifier on the secondary-side also
increases. The feedback current is sunk at the FB/OLP
pin, transferred through a photo-coupler, PC1, and the
FB/OLP pin voltage decreases. Thus, VSC decreases,
and the peak value of VROCP is controlled to be low,
and the peak drain current of ID decreases. This
control prevents the output voltage from increasing.
● Heavy load conditions
When load conditions become greater, the IC
performs the inverse operation to that described above.
Thus, VSC increases and the peak drain current of ID
increases.This control prevents the output voltage
from decreasing.
In the current mode control method, when the drain
current waveform becomes trapezoidal in continuous
operating mode, even if the peak current level set by the


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