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| NR111D Datasheet, PDF (1/14 Pages) Sanken electric – Light Load High Efficiency | |||
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Light Load High Efficiency,31V, Current Mode Step-Down 4A Switcing Regulator IC
NR111D
Oct./17/2013
General Descriptions
The NR111D is buck regulator ICs integrates High-side
power MOSFETs. The feature increasing efficiency at light
loads allows the device to be used in the energy-saving
applications. 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 NR111D is available in an
8-pin DIP package.
Features & Benefits
ï¬ Current mode PWM control
ï¬ Up to 94% Efficiency,
Up to 68% Efficiency at IO = 20mA Light Load
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
ï¬ DIP8 Package
BS
SS
IN
EN
NR111D
SW
Iset
GND
FB
Electrical Characteristics
ï¬ 4A output current
ï¬ Operating input range VIN = 6.5Vï½31V
ï¬ Output adjustable VO= 0.8Vï½24V
ï¬ Fixed 350kHz frequency
Applications
ï· LCD TV / Blu-Ray / Set top box
ï· Home appliance
ï· Green Electronic products
ï· Other power supply
Package
Typical Application Circuit
VIN
R3
VIN_s
C2
C1
GND
2
R1
IN
7
EN
C10
1
BS
3
L1
SW
NR11111DE
R5
8
SS
GND
5
FB
ISET
R4
4
6
C9
R7
R6
D1
C1, C2: 10μF / 35V
C4, C5: 22μF / 16V
C9: 0.1μF
C10: 0.1μF
SW
R1: 1.7MΩ
L1: 10μH
R3: 22Ω
R4: 18kΩ, R5: 2.7kΩ (Vo=5.0V)
R6: 3.9kΩ
Vo
Vo_s
C4 C5
GND
Rev.1.1
SANKEN ELECTRIC CO., LTD.
1
http://www.sanken-ele.co.jp
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