Buck Converter. SI-8120JD Datasheet

SI-8120JD Converter. Datasheet pdf. Equivalent

SI-8120JD Datasheet
Recommendation SI-8120JD Datasheet
Part SI-8120JD
Description Buck Converter
Feature SI-8120JD; 1.5 A, Buck Converter IC SI-8000JD Series Data Sheet Description SI-8000JD series are buck convert.
Manufacture Sanken
Datasheet
Download SI-8120JD Datasheet





Sanken SI-8120JD
1.5 A, Buck Converter IC
SI-8000JD Series
Data Sheet
Description
SI-8000JD series are buck converter ICs whose
maximum output current is 1.5 A.
These products have various functions including the
Output On/Off Function, the Overcurrent Protection and
the Thermal Shutdown, and achieve a buck converter
circuit with few external components.
Features
High Efficiency 88%
(SI-8120JD: VIN = 24 V, IOUT = 0.5 A)
Few Components
Downsized Choke Coil
(Switching Frequency 125 kHz (typ.))
Fixed Output Voltage
On/Off Function
Low Supply Current during Output Off
Protection Functions
Overcurrent Protections (OCP): Fold-back Type,
Auto-restart
Thermal Shutdown (TSD): Auto-restart
Typical Application
SI-8000JD
Package
TO263-5L
Not to scale
Selection Guide
Part Number
SI-8033JD
SI-8050JD
SI-8090JD
SI-8120JD
Output Voltage
3.3 V
5V
9V
12 V
Applications
For the systems requiring power supplies such as:
Audio Visual Equipment
Office Automation Equipment (e.g., Printer)
Onboard power supply
VIN
12345
L1
VOUT
CIN
GND
D1
COUT
GND
SI-8000JD-DSE Rev.2.1
SANKEN ELECTRIC CO., LTD.
1
Sep. 03, 2020
https://www.sanken-ele.co.jp/en
© SANKEN ELECTRIC CO., LTD. 2011



Sanken SI-8120JD
SI-8000JD
Contents
Description ------------------------------------------------------------------------------------------------------ 1
Contents --------------------------------------------------------------------------------------------------------- 2
1. Absolute Maximum Ratings----------------------------------------------------------------------------- 3
2. Thermal Resistance Characteristics ------------------------------------------------------------------- 3
3. Recommended Operating Conditions ----------------------------------------------------------------- 4
4. Electrical Characteristics -------------------------------------------------------------------------------- 5
4.1. SI-8033JD --------------------------------------------------------------------------------------------- 5
4.2. SI-8050JD --------------------------------------------------------------------------------------------- 6
4.3. SI-8090JD --------------------------------------------------------------------------------------------- 7
4.4. SI-8120JD --------------------------------------------------------------------------------------------- 8
5. Block Diagram --------------------------------------------------------------------------------------------- 9
6. Pin Configuration Definitions--------------------------------------------------------------------------- 9
7. Typical Application ------------------------------------------------------------------------------------- 10
8. Physical Dimensions ------------------------------------------------------------------------------------ 11
8.1. Land Pattern Example --------------------------------------------------------------------------- 11
9. Marking Diagram --------------------------------------------------------------------------------------- 12
10. Operational Description ------------------------------------------------------------------------------- 13
10.1. PWM Output Voltage Control------------------------------------------------------------------ 13
10.2. Input/output Current and Inductor Current ------------------------------------------------ 13
10.3. Overcurrent Protection Function (OCP) ----------------------------------------------------- 14
10.4. Thermal Shutdown (TSD) ----------------------------------------------------------------------- 14
10.5. Output On/Off Function ------------------------------------------------------------------------- 14
11. Design Notes ---------------------------------------------------------------------------------------------- 15
11.1. Selecting External Components ---------------------------------------------------------------- 15
11.1.1. Inductor, L1 ---------------------------------------------------------------------------------- 15
11.1.2. Input Capacitor, CIN ------------------------------------------------------------------------ 15
11.1.3. Output Capacitor, COUT -------------------------------------------------------------------- 16
11.1.4. Freewheeling Diode, D1 -------------------------------------------------------------------- 17
11.1.5. Spike Noise Reduction ---------------------------------------------------------------------- 17
11.1.6. Reverse Biasing Protection ---------------------------------------------------------------- 18
11.2. PCB Layout----------------------------------------------------------------------------------------- 18
11.2.1. High Current Line -------------------------------------------------------------------------- 18
11.2.2. Input/ Output Capacitor ------------------------------------------------------------------- 18
11.3. Operational Waveforms Confirmation ------------------------------------------------------- 19
11.4. Thermal Design ------------------------------------------------------------------------------------ 20
12. Pattern Layout Example ------------------------------------------------------------------------------- 21
13. Typical Characteristics--------------------------------------------------------------------------------- 22
13.1. SI-8033JD ------------------------------------------------------------------------------------------- 22
13.2. SI-8050JD ------------------------------------------------------------------------------------------- 23
13.3. SI-8090JD ------------------------------------------------------------------------------------------- 25
13.4. SI-8120JD ------------------------------------------------------------------------------------------- 26
13.6. Thermal Derating Curve------------------------------------------------------------------------- 28
Important Notes---------------------------------------------------------------------------------------------- 29
SI-8000JD-DSE Rev.2.1
SANKEN ELECTRIC CO., LTD.
2
Sep. 03, 2020
https://www.sanken-ele.co.jp/en
© SANKEN ELECTRIC CO., LTD. 2011



Sanken SI-8120JD
SI-8000JD
1. Absolute Maximum Ratings
Current polarities are defined as follows: current going into the IC (sinking) is positive current (+); current coming
out of the IC (sourcing) is negative current (−). Unless specifically noted, TA = 25 °C.
Parameter
Symbol
Conditions
Rating
Unit Remarks
Input Voltage
Allowable Power Dissipation
VIN
PD(1)
(2)
43
V
3
W
Junction Temperature
TJ
125
°C
Storage Temperature
TSTG
40 to 125
°C
(1) Limited by the thermal shutdown.
(2) Glass-epoxy board (40 mm × 40 mm), copper area 100%
2. Thermal Resistance Characteristics
Parameter
Symbol
Conditions
Min. Typ. Max. Unit
Thermal Resistance between Junction
and Ambient
θJ-A
Mounted on the board.*
Thermal Resistance between Junction
and Lead
θJ-L
See Figure 2-1.
33.3 °C/W
3
°C/W
TC
Figure 2-1. Case Temperature Measurement Point
* Glass-epoxy board (40 mm × 40 mm), copper area 100%
SI-8000JD-DSE Rev.2.1
SANKEN ELECTRIC CO., LTD.
3
Sep. 03, 2020
https://www.sanken-ele.co.jp/en
© SANKEN ELECTRIC CO., LTD. 2011





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