Document
SI-8050TFE DC-to-DC Step-Down Converter
Features and Benefits
1.5 A output current supplied in a small, through-hole mount power package High efficiency: 81% at VIN= 15 V, IO= 0.5 A,VO= 5 V Requires only four external components (optional soft start requires an additional capacitor) Oscillation circuit built-in (frequency 300 kHz typical) Constant-current mode overcurrent protection circuit and overtemperature protection circuit built-in Soft start function built-in (can be implemented as an on/off function; output-off state at low level) Low current consumption during output-off state
Package: TO220F-5
Description
The SI-8050TFE DC voltage regulator is a DC-to-DC buck convertor that attains an oscillation frequency of 300 kHz, and has an integrated miniaturized choke coil, allowing it to serve as a small, high efficiency power supply in a compact TO220F package.
The internal switching regulator function provides high efficiency switching regulation without any need for adjustment. The device requires only six external support components. The optional soft start function requires an additional capacitor. Optional on/off control can be performed using a transistor. The SI-8050TFE includes overcurrent and overtemperature protection circuits.
Applications include: DVD recorder FPD TV Telecommunications equipment Office automation equipment, such as printers On-board local power supply Output voltage regulator for second stage of SMPS (switched mode power supply)
Not to scale
Functional Block Diagram
VIN 1 IN C1
PReg
Overcurrent Protection
SW 2
L1
Di RK16 (Sanken)
5 SS On/Off
Soft Start
C3
Reset
Osc Comparator
Error Amplifier
Latch and Driver
VOS 4 Overtemperature
Protection
GND 3
Reference Voltage
27469.063
SANKEN ELECTRIC CO., LTD.
http://www.sanken-ele.co.jp/en/
VOUT C2
SI-8050TFE
Selection Guide
Part Number SI-8050TFE
Efficiency, Typ. (%)
81
DC-to-DC Step-Down Converter
Input Voltage, Max. (V)
40
Output Current, Max. (A)
1.5
Packing 50 pieces per tube
Absolute Maximum Ratings
Characteristic DC Input Voltage
Power Dissipation
Junction Temperature Storage Temperature Thermal Resistance (junction-to-case) Thermal Resistance (junction-to-ambient air)
Symbol VIN PD1-1 PD1-2 PD2-1 PD2-2 TJ Tstg RJC RJA
Remarks
Connected to infinite heatsink; TJ(max) = 150°C, limited by internal overtemperature protection. Connected to infinite heatsink; TJ = 125°C. No heatsink; TJ(max) = 150°C, limited by internal overtemperature protection. No heatsink; TJ = 125°C. Internal overtemperature protection circuit may enable when TJ ≥ 130°C. During product operation, recommended TJ ≤ 125°C.
Rating 43
Units V
17.8 W
14.2 W
2.15 W
1.72 W
–30 to 150 °C
–40 to 150 7 58
°C °C/W °C/W
Recommended Operating Conditions*
Characteristic
Symbol
Remarks
DC Input Voltage Range
VIN VIN (min) is the greater of 4.5 V or VO+3 V.
DC Output Voltage Range DC Output Current Range
VO
VIN ≥ VO + 3 V; to be used within the allowable package IO power dis.