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STR5A162D 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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Trang chủ  http://www.sanken-ele.co.jp/en
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STR5A100D Series
STR5A100D-DS Rev.1.2
SANKEN ELECTRIC CO.,LTD.
11
Dec. 25, 2013
decreases to about 1.6 V or less, the IC is stops
oscillation and restarts. The IC repeats the intermittent
oscillation operation until the FB pin voltage keeps
about 1.6 V or more after the output voltage increases.
VOUT
Output Current IOUT
CV Mode
CC Mode
OUT
OSC
2
DLIM
P
)
K
P
(
OUT
V
2
f
I
L
I
Output Voltage
Figure 10-9 CV/CC characteristics
10.8 Leading Edge Blanking Function
The IC uses the peak-current-mode control method
for the constant voltage control of output.
In peak-current-mode control method, there is a case
that the power MOSFET turns off due to unexpected
response of FB comparator or overcurrent protection
circuit (OCP) to the steep surge current in turning on a
power MOSFET.
In order to prevent this operation, Leading Edge
Blanking Time, tBW = 250 ns is built-in.
In the period of tBW, the IC does not respond to the
surge voltage in turning on the power MOSFET.
10.9 Random Switching Function
The IC modulates its switching frequency randomly
by superposing the modulating frequency on fOSC(AVG) in
normal operation. This function reduces the conduction
noise compared to others without this function, and
simplifies noise filtering of the input lines of power
supply.
10.10 Auto Standby Function
Auto Standby Function automatically changes the
oscillation mode to green mode or burst oscillation mode,
when the output load becomes lower, the drain current
ID decreases and the oscillation frequency becomes
lower gradually (Green Mode) as shown in Figure
10-10.
In order to reduce the switching loss, the number of
switching is reduced in green mode and the switching
operation is stopped during a constant period in burst
oscillation mode.
The burst oscillation mode operates by the Standby
Operation Cycle, TSTBOP = 1.3 ms and the switching
frequency about 23 kHz. In light load, the number of
minimum switching times is two times in TSTBOP (refer
to Figure 10-11)
Since the oscillator of burst oscillation cycle setting
and the oscillator of switching oscillation frequency
setting are not synchronized each other, the switching
frequency may be high at near the Standby Operation
Threshold Voltage, VSTBOP.
Switching
frequency
fOSC
Output power, PO
65kHz
About
23kHz
Burst oscillation
Normal
operation
Standby power
Green mode
Burst cycle is 1.3ms
Figure 10-10 Relationship between PO and fOSC
Time
ID
TSTBOP = 1.3 ms
About 23 kHz
Figure 10-11 Switching waveform at burst oscillation
10.11 Overcurrent Protection Function (OCP)
Overcurrent Protection Function (OCP) detects each
drain peak current level of a power MOSFET on
pulse-by-pulse basis, and limits the output power when
the current level reaches to Drain Current Limit.
When this OCP operation continues for more than the
Constant Current Control Delay Time, tCCD = 90 ms,
Constant Current (CC) control is activated (refer to 10.7
Constant Current (CC) Control).
Input Compensation Function
ICs with PWM control usually have some propagation
delay time. The steeper the slope of the actual drain
current at a high AC input voltage is, the larger the
actual drain peak current is, compared to the Drain
Current Limit. Thus, the peak current has some variation
depending on the AC input voltage in the drain current
limitation state.
In order to reduce the variation of peak current in the
drain current limitation state, the IC incorporates a
built-in Input Compensation function.
The Input Compensation function superposes a signal
with a constant slope (Figure 10-12) into the internal
current detection signal and varies the internal threshold
voltage.


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