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PDF STR5A162D Data sheet ( Hoja de datos )
| Número de pieza | STR5A162D | |
| Descripción | Primary Side Regulation Off-Line PWM Controllers | |
| Fabricantes | SANKEN | |
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Primary Side Regulation
Off-Line PWM Controllers with Integrated Power MOSFET
STR5A100D Series
General Descriptions
The STR5A100D series is power IC with primary side
regulation for switching power supplies, incorporating a
sense MOSFET and a current mode PWM controller IC.
Employing the Primary Side Regulation, the product
achieves power supply systems with few external
components. Including a startup circuit and a standby
function in the controller, the product achieves the low
standby power by the automatic switching between the
PWM operation in normal operation and the
burst-oscillation under light load conditions. The rich set
of protection features helps to realize low component
counts, and high performance-to-cost power supply.
Features
Primary Side Regulation
Constant Voltage (CV), Constant Current (CC) Control
Auto Standby Function
No Load Power Consumption < 30mW
Operation Mode
・Normal Operation -------------------------- PWM Mode
・Light Load Operation ----------------------Green-Mode
・Standby------------------------- Burst Oscillation Mode
Build-in Startup Circuit
(reducing power consumption at standby operation,
shortening the startup time)
Current Mode Type PWM Control
Random Switching Function
Leading Edge Blanking Function
Soft Start Function (reducing the stress of power
MOSFET and secondary side rectifier diode at startup)
Protections
Overcurrent Protection (OCP)------------Pulse-by-Pulse
Overvoltage Protection (OVP) ------------- Auto-Restart
Thermal Shutdown Protection (TSD) ----- Auto-Restart
Package
DIP8
FB 1
VCC 2
D/ST 4
Not to scale
8 COMP
7 S/GND
6 S/GND
5 S/GND
Lineup
Electrical Characteristics
VD/ST(max.) = 730 V
fOSC(AVG)(typ.) = 65 kHz
Products
RDS(ON) (max.)
STR5A162D
24.6 Ω
STR5A164D
13 Ω
IDLIM(H)
0.285 A
0.41 A
Output Power, POUT*
Products
Adapter
AC85
AC230V ~265V
STR5A162D 4 W 3.5 W
Open frame
AC85
AC230V ~265V
5 W 4.5 W
STR5A164D 6.0 W 5.5 W 8.5 W 7 W
* The EI-16 core of transformer is assumed. The output power is
actual continues power that is measured at 50 °C ambient. The
peak output power can be 120 to 140 % of the value stated here.
Core size, ON Duty, and thermal design affect the output power.
It may be less than the value stated here.
Typical Application Circuit
VAC
C6
BR1 L1
C1 C2
U1
S/GND
5
D/ST
4
S/GND
6
S/GND
7
VCC
2
C5
COMP
R7 8
FB 1
STR5A100D
C3 R1
R2
D1
T1 D50
VOUT
(+)
R51 C51
P
S1
C52 R52
D2 R6
C4
R3 D
R4
R5
(-)
Applications
White Goods
Other SMPS
STR5A100D-DS Rev.1.3
Aug. 08, 2014
SANKEN ELECTRIC CO.,LTD.
http://www.sanken-ele.co.jp/en/
1
1 page  
STR5A100D Series
4. Performance Curves
1.6
1.53
1.4
1.2
1
0.8
0.6
0.4
0.2
0
0 25 50 75 100 125 150
Ambient Temperature, TA (°C)
Figure 4-3 Ambient Temperature versus
Power Dissipation Curve
Time (s)
Figure 4-2 STR5A162D Transient Thermal Resistance Curve
Time (s)
Figure 4-2 STR5A164D Transient Thermal Resistance Curve
STR5A100D-DS Rev.1.3
Aug. 08, 2014
SANKEN ELECTRIC CO.,LTD.
5
5 Page 
STR5A100D Series
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.
Output Voltage
VOUT
I OUT( PK )
LP
I2
DLIM
f OSC
2VOUT
CV Mode
CC Mode
Output Current IOUT
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
65kHz
About
23kHz
Green mode
Burst oscillation
Normal
operation
Burst cycle is 1.3ms
Standby power
Output power, PO
Figure 10-10 Relationship between PO and fOSC
ID TSTBOP = 1.3 ms
About 23 kHz
Time
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
Section 10.7).
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.
When AC input voltage is low (ON Duty is broad),
STR5A100D-DS Rev.1.3
Aug. 08, 2014
SANKEN ELECTRIC CO.,LTD.
11
11 Page | ||
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| PDF Descargar | [ Datasheet STR5A162D.PDF ] | |
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