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STR5A451D Datasheet Preview

STR5A451D Datasheet

Off-Line PWM Controller

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For Non-Isolated
Off-Line PWM Controllers with Integrated Power MOSFET
STR5A450D Series
Data Sheet
Description
The STR5A450D Series is power ICs for switching
power supplies, incorporating a MOSFET and a current
mode PWM controller IC for non-isolated Buck
converter and Inverting converter topologies.
The operation mode is automatically changed, in
response to load, to the fixed switching frequency, to the
switching frequency control, and to the burst oscillation
mode. Thus the power efficiency is improved.
The product achieves high cost-performance power
supply systems with few external components.
Features
Buck converter
Inverting converter
Current mode type PWM control
Automatically changed operation mode in response to
load conditions
Fixed switching frequency mode, 60 kHz (typ.)
Green mode, 23 kHz (typ.) to 60 kHz (typ.)
Burst oscillation mode
Built-in Startup Function
reducing power consumption, and shortening the
startup time
Built-in Error Amplifier
Random Switching Function
Leading Edge Blanking Function
Soft Start Function
Protections
Overcurrent Protection (OCP): adjustabe by an
external current detection resistor, including OCP
input compensation function
Overload Protection (OLP): Auto-restart
Overvoltage Protection (OVP): Auto-restart
Thermal Shutdown with hysteresis (TSD): Auto-restart
Typical Application (Buck Convertor)
VAC
STR5A450D
D/ST
5
D/ST
6
D/ST
7
VCC
GND
FB
4
C4
3
C2
2
D/ST
8
S/OCP
1
U1
ROCP
C1
D1
R1 C3
R2 R3
L1
D2 VOUT
(+)
D3
C5 R4
(-)
TC_STR5A450_1_R1
Package
DIP8
S/OCP 1
FB 2
GND 3
VCC 4
8 D/ST
7 D/ST
6 D/ST
5 D/ST
Not to scale
Selection Guide
Electrical Characteristics
fOSC(AVG) = 60 kHz (typ.)
VD/ST = 650 V (max.)
Part
Number
STR5A451D
RDS(ON)
(max.)
4.0 Ω
IOUT(MAX)*
(Universal, open
frame, VOUT = 24 V)
0.7 A
STR5A453D
1.9 Ω
0.9 A
* The output power is actual continues current that is
measured at 50 °C ambient. The peak output current
can be 120 to 140 % of the value stated here. Thermal
design affects the output current. It may be less than
the value stated here.
Recommended Operating Condition
Parameter
Buck
Converter
Inverting
Converter
Input Voltage
AC 85 V to AC 265 V
D/ST Input
Voltage
≥ 40 V
Output Voltage
> 11 V
> 27.5 V
Range*
< 27.5 V
< 11 V
*Add a zener diode or a regulator to VCC pin when
target output voltage is high.
Applications
White goods
Auxiliary power supply (lighting equipment with
microcomputer, etc.)
Power supply for motor control (actuator, etc.)
Telecommunication equipment (convertible from
48VDC to 15VDC)
Other Switchung mode power supply, SMPS
STR5A450D-DSE Rev.1.3
SANKEN ELECTRIC CO., LTD.
1
Mar. 13, 2019
https://www.sanken-ele.co.jp/en
© SANKEN ELECTRIC CO., LTD. 2015




Sanken

STR5A451D Datasheet Preview

STR5A451D Datasheet

Off-Line PWM Controller

No Preview Available !

STR5A450D Series
Contents
Description ------------------------------------------------------------------------------------------------------ 1
1. Absolute Maximum Ratings----------------------------------------------------------------------------- 3
2. Electrical Characteristics -------------------------------------------------------------------------------- 3
3. Performance Curves -------------------------------------------------------------------------------------- 5
3.1 Derating Curves ------------------------------------------------------------------------------------- 5
3.2 MOSFET Safe Operating Area Curves --------------------------------------------------------- 5
3.3 Ambient Temperature versus Power Dissipation Curves ----------------------------------- 6
3.4 Transient Thermal Resistance Curves ---------------------------------------------------------- 6
4. Block Diagram --------------------------------------------------------------------------------------------- 7
5. Pin Configuration Definitions--------------------------------------------------------------------------- 7
6. Typical Applications -------------------------------------------------------------------------------------- 8
7. Physical Dimensions -------------------------------------------------------------------------------------- 9
8. Marking Diagram ----------------------------------------------------------------------------------------- 9
9. Operational Description ------------------------------------------------------------------------------- 10
9.1 Startup Operation of IC ------------------------------------------------------------------------- 10
9.2 Undervoltage Lockout (UVLO) ---------------------------------------------------------------- 10
9.3 Power Supply Startup and Soft Start Function --------------------------------------------- 10
9.4 Constant Voltage (CV) Control----------------------------------------------------------------- 11
9.4.1 Buck Converter Operation ---------------------------------------------------------------- 12
9.4.2 Inverting Converter Operation ----------------------------------------------------------- 12
9.5 Leading Edge Blanking Function -------------------------------------------------------------- 13
9.6 Random Switching Function -------------------------------------------------------------------- 13
9.7 Operation Mode ----------------------------------------------------------------------------------- 13
9.8 Overcurrent Protection (OCP) ----------------------------------------------------------------- 14
9.8.1 OCP Operation ------------------------------------------------------------------------------ 14
9.8.2 OCP Input Compensation Function ----------------------------------------------------- 14
9.9 Overload Protection (OLP)---------------------------------------------------------------------- 14
9.10 Overvoltage Protection (OVP) ------------------------------------------------------------------ 15
9.11 Thermal Shutdown (TSD) ----------------------------------------------------------------------- 15
10. Design Notes ---------------------------------------------------------------------------------------------- 15
10.1 External Components ---------------------------------------------------------------------------- 15
10.1.1 Input and Output Electrolytic Capacitor ----------------------------------------------- 16
10.1.2 Inductor --------------------------------------------------------------------------------------- 16
10.1.3 VCC Pin Peripheral Circuit--------------------------------------------------------------- 16
10.1.4 FB Pin Peripheral Circuit ----------------------------------------------------------------- 16
10.1.5 Freewheeling Diode ------------------------------------------------------------------------- 16
10.1.6 Bleeder Resistance -------------------------------------------------------------------------- 16
10.2 D/ST Pin--------------------------------------------------------------------------------------------- 16
10.3 Inductance Calculation--------------------------------------------------------------------------- 17
10.3.1 Parameter Definition ----------------------------------------------------------------------- 17
10.3.2 Buck Convertor ------------------------------------------------------------------------------ 18
10.3.3 Inverting Convertor ------------------------------------------------------------------------ 23
10.4 PCB Trace Layout -------------------------------------------------------------------------------- 28
11. Reference Design of Power Supply ------------------------------------------------------------------ 30
11.1 Buck Converter ------------------------------------------------------------------------------------ 30
11.2 Inverting Converter------------------------------------------------------------------------------- 31
Important Notes---------------------------------------------------------------------------------------------- 32
STR5A450D-DSE Rev.1.3
SANKEN ELECTRIC CO., LTD.
2
Mar. 13, 2019
https://www.sanken-ele.co.jp/en
© SANKEN ELECTRIC CO., LTD. 2015


Part Number STR5A451D
Description Off-Line PWM Controller
Maker Sanken
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STR5A451D Datasheet PDF






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