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PDF ( 数据手册 , 数据表 ) STR5A162D

零件编号 STR5A162D
描述 Primary Side Regulation Off-Line PWM Controllers
制造商 SANKEN
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STR5A162D 数据手册, 描述, 功能
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







STR5A162D pdf, 数据表
STR5A100D Series
10. Operational Description
All of the parameter values used in these descriptions
are typical values, unless they are specified as
minimum or maximum.
With regard to current direction, "+" indicates sink
current (toward the IC) and "" indicates source
current (from the IC).
10.1 Startup Operation
Figure 10-1 shows the VCC pin peripheral circuit.
The IC incorporates the startup circuit. The circuit is
connected to D/ST pin. When D/ST pin voltage reaches
to Startup Circuit Operation Voltage VSTARTUP = 29 V,
the startup circuit starts operation.
During the startup process, the constant current,
ISTARTUP = 2.1 mA, charges C4 at VCC pin. When
VCC pin voltage increases to VCC(ON) = 15.0 V, the
control circuit starts switching operation. After
switching operation begins, the startup circuit turns off
automatically so that its current consumption becomes
zero.
The approximate startup time of IC, tSTART, is
calculated as follows:
t START
C4 VCC(ON)VCC(INT)
I STARTUP
(1)
where,
tSTART: Startup time of IC in second
VCC(INT) : Initial voltage on VCC pin in V
VAC
L1
C1 C2
T1
P
4
D/ST
VCC 2
U1
D2 R6
R3
D
C4
R4
VD
S/GND 5,6,7
R5
FB 1
Figure 10-1 VCC pin peripheral circuit
10.2 Undervoltage Lockout (UVLO)
Figure 10-2 shows the relationship of VCC pin
voltage and circuit current ICC. When VCC pin voltage
increases to VCC(ON) = 15.0 V, the control circuit starts
switching operation and the circuit current ICC increases.
When VCC pin voltage decreases to VCC(OFF) = 8.1 V,
the control circuit stops operation by UVLO
(Undervoltage Lockout) circuit, and reverts to the state
before startup.
Circuit current, ICC
ICCON
Stop Start
VCCOFF
VCCON
VCC pin
voltage
Figure 10-2 Relationship between
VCC pin voltage and ICC
10.3 Auxiliary Winding
Figure 10-3 shows VCC voltage behavior during the
startup period. When VCC pin voltage increases to
VCC(ON) = 15.0 V at startup, the IC starts the operation.
Then circuit current increases and VCC pin voltage
decreases. Since the Operation Stop Voltage
VCC(OFF) = 8.1 V is low, the auxiliary winding voltage
reaches to setting value before VCC pin voltage
decreases to VCC(OFF). Thus control circuit continues the
operation. The voltage from the auxiliary winding D in
Figure 10-1 becomes a power source to the control
circuit in operation. The approximate value of auxiliary
winding voltage is about 12 V to 16 V, taking account of
the winding turns of D winding so that VCC pin voltage
satisfies Equation (2) within the specification of input
and output voltage variation of power supply.
VCC pin voltage IC starts operation Startup success
VCC(ON)
VCC(OFF)
Target operating
voltage
Increase with rising of
output voltage
Startup failure
Time
Figure 10-3 VCC pin voltage during startup period
STR5A100D-DS Rev.1.3
Aug. 08, 2014
SANKEN ELECTRIC CO.,LTD.
8







STR5A162D equivalent, schematic
STR5A100D Series
(4) COMP Trace Layout
C5, C6 and R7 are connected to COMP pin for phase
compensation. These capacitors and resistor should
be placed to shorten the trace between COMP pin
and S/GND pin. In order to stabilize the operation of
IC, a dedicated trace to S/GND pin is recommended.
(5) FB Trace Layout
The auxiliary winding voltage is divided by resistors
and is induced to FB pin. In order to achieve the
accurate primary side regulation, the trace between
the resistors and FB pin should be as short as
possible.
(6) Secondary Rectifier Smoothing Circuit Trace
Layout:
This is the trace of the rectifier smoothing loop,
carrying the switching current, and thus it should be
as wide trace and small loop as possible. If this trace
is thin and long, inductance resulting from the loop
may increase surge voltage at turning off the power
MOSFET. Proper rectifier smoothing trace layout
helps to increase margin against the power MOSFET
breakdown voltage, and reduces stress on the clamp
snubber circuit and losses in it.
(7) Thermal Considerations
Because the power MOSFET has a positive thermal
coefficient of RDS(ON), consider it in thermal design.
Since the copper area under the IC and the S/GND
trace act as a heatsink, its traces should be as wide as
possible.
F1
VAC
BR1
C1
L1
C2
(7)Trace of S/GND pin should be wide
for heat release
(2)GND trace for IC should be
connected at a single point
C6
R7
(1) Main trace should be wide trace and small loop
(6)Main trace of secondary side should be
wide trace and small loop
C8
U1
S/GND
5
D/ST
4
S/GND
6
S/GND
7
C5
COMP
8
VCC
2
FB
1
STR5A1××D
T1
C3 R1
R2 P
D1 S
D50
R51 C51
C52 R52
D2 R6
R3
D
R4
C4
R5
C7
(5) The components connected to FB
pin should be short
(4)The components connected to COMP pin should be short, and these
components connected to S/GND pin should be dedicated trace.
(3) Loop of the power supply should be small
Figure 11-7 Example of peripheral circuit around the IC
STR5A100D-DS Rev.1.3
Aug. 08, 2014
SANKEN ELECTRIC CO.,LTD.
16










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