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NR121E Datasheet, PDF (1/12 Pages) Sanken electric – Buck Regulator | |||
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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
ï¬ Exposed SOIC 8
Thermally enhanced 8-Pin package
Features & Benefits
ï¬ Current mode PWM control
ï¬ Up to 94% efficiency
ï¬ Stable with low ESR ceramic output capacitors
ï¬ Built-in protection function
Over Current Protection (OCP)
Thermal Shutdown (TSD)
Under Voltage Lockout (UVLO)
ï¬ Built-in phase compensation
ï¬ Adjustable Soft-Start with an external capacitor
ï¬ Turn ON/OF the regulator function
Electrical Characteristics
ï¬ 3A output current
ï¬ Operating input range VIN = 4.5Vï½18V
ï¬ Output adjustable VO = 0.8Vï½14V
ï¬ Fixed 350kHz frequency
Applications
ï¬ LCD TV / Blu-Ray / Set top box
ï¬ Green Electronic products
ï¬ Other power supply
Typical Application Circuit
VIN
VIN_s
R1
C1
C2
C9
GND
R3
2
IN
7 EN
1
C10
BS SW 3
NR121E
8 SS
GND
FB 5
NC
4
6
SW
L1
R5
R4
R6
D1
Vo
Vo _s
C4 C5
GND
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.
1
http://www.sanken-ele.co.jp
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