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PDF NR121E Data sheet ( Hoja de datos )
| Número de pieza | NR121E | |
| Descripción | 3A 18V Buck Regulator | |
| Fabricantes | SANKEN | |
| Logotipo |  |
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3A, 18V, Buck Regulator
NR120E series
May/16/2012
eneral Descriptions
The NR120E series is buck regulator ICs integrates
High-side power MOSFET. With the current mode
control, ultra low ESR capacitors such as ceramic
capacitors can be used. The ICs have protection functions
such as Over-Current Protection (OCP), Under-Voltage
Lockout (UVLO) and Thermal Shutdown (TSD). An
adjustable Soft-Start by an external capacitor prevents the
excessive inrush current at turn-on. The ICs integrate
phase compensation circuit which reduces the number of
external components and simplifies the design of
customer application. The ON/OFF pin (EN Pin) turns
the regulator on or off and helps to achieve low power
consumption requirements. The NR120E series is
available in an 8-pin SOIC package with an exposed
thermal pad on the back side.
Package
Exposed SOIC 8
Thermally enhanced 8-Pin package
Features & Benefits
Current mode PWM control
Up to 94% efficiency
Stable with low ESR ceramic output capacitors
Built-in protection function
Over Current Protection (OCP)
Thermal Shutdown (TSD)
Under Voltage Lockout (UVLO)
Built-in phase compensation
Adjustable Soft-Start with an external capacitor
Turn ON/OF the regulator function
Electrical Characteristics
3A output current
Operating input range VIN = 4.5V～18V
Output adjustable VO = 0.8V～14V
Fixed 350kHz frequency
Applications
LCD TV / Blu-Ray / Set top box
Green Electronic products
Other power supply
Typical Application Circuit
VIN
VIN_s
C1 C2
GND
R3
R1 2
IN
7 EN
1 C10
BS SW 3
NR121E
8 SS
GND
C9
4
FB 5
NC
6
L1
R5
R4
R6
D1
Vo
Vo _s
C4 C5
GND
SW
C1, C2: 10μF / 25V
C4, C5: 22μF / 16V
C9: 0.1μF
C10: 0.1μF
R1: 100kΩ
R3: 22Ω
R4: 8.2 kΩ, R5: 4.3kΩ (VO=3.3V)
R6: 3.9kΩ
D1: SJPB-L4
L1: 10μH
Rev.0.3
SANKEN ELECTRIC CO., LTD.
http://www.sanken-ele.co.jp
1
http://www.Datasheet4U.com
1 page  
3A, 18V, Buck Regulator
NR120E series
NR121E Typical Performance Characteristics
Output startup
VO=3.3V, Load = Constant Resistance, IO=0.5A
4
3.5
3
2.5
2
1.5
1
0.5
0
3 3.5 4 4.5 5 5.5
Input Voltage : VIN [V]
6
May/16/2012
Over Current Protection
VO=3.3V
4
3
2
VIN=8V
1 VIN=12V
VIN=16V
0
01234
Output Current : Io [A]
5
3.35
3.33
3.31
3.29
3.27
3.25
0
Load Regulation
VO=3.3V
VIN=8V
VIN=12V
VIN=18V
12
Output Current : Io [A]
3
10.0
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
0
Shutdown Supply Current
VEN=0V
2 4 6 8 10 12 14 16 18
Input Voltage : VIN [V]
400
390
380
370
360
350
340
330
320
310
300
0
Switching Frequency
VO=3.3V
VIN=8V
VIN=12V
VIN=18V
12
Output Current : Io [A]
3
Supply Current
VO=3.3V
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
0 2 4 6 8 10 12 14 16 18
Input Voltage : VIN [V]
Rev.0.3
SANKEN ELECTRIC CO., LTD.
http://www.sanken-ele.co.jp
5
5 Page 
3A, 18V, Buck Regulator
NR120E series
May/16/2012
OPERATING PRECAUTIONS
Reliability can be affected adversely by improper storage environments and handling methods. Please observe the
following cautions.
Cautions for Storage
Ensure that storage conditions comply with the standard temperature (5 to 35°C) and the standard relative humidity
(around 40 to 75%); avoid storage locations that experience extreme changes in temperature or humidity.
Avoid locations where dust or harmful gases are present and avoid direct sunlight.
Reinspect for rust on leads and solderability of products that have been stored for a long time.
Cautions for Testing and Handling
When tests are carried out during inspection testing and other standard test periods, protect the products from power
surges from the testing products, shorts between the product pins, and wrong connections. In addition, avoid tests
exceeded ratings
Soldering
When soldering the products, please be sure to minimize the working time, within the following limits.
・Reflow Preheat ; 180°C / 90±30s
Heat ; 250°C / 10±1s (260°C peak ,2times)
・Soldering iron ; 380±10°C / 3.5±0.5s (1time)
Electrostatic Discharge
When handling the products, the operator must be grounded. Grounded wrist straps worn should have at least 1MΩ of
resistance from the operator to ground to prevent shock hazard, and it should be placed near the operator.
Workbenches where the products are handled should be grounded and be provided with conductive table and floor mats.
When using measuring equipment such as a curve tracer, the equipment should be grounded.
When soldering the products, the head of a soldering irons or the solder bath must be grounded in order to prevent leak
voltages generated by them from being applied to the products.
The products should always be stored and transported in Sanken shipping containers or conductive containers, or be
wrapped in aluminum foil.
Rev.0.3
SANKEN ELECTRIC CO., LTD.
http://www.sanken-ele.co.jp
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet NR121E.PDF ] | |
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