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SANKEN - Light Load High Efficiency Current Mode Step-Down 4A Switcing Regulator IC

Numéro de référence NR111D
Description Light Load High Efficiency Current Mode Step-Down 4A Switcing Regulator IC
Fabricant SANKEN 
Logo SANKEN 





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NR111D fiche technique
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
Current mode PWM control
Up to 94% Efficiency,
Up to 68% Efficiency at IO = 20mA Light Load
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
DIP8 Package
BS
IN
SW
GND
NR111D
SS
EN
Iset
FB
Electrical Characteristics
4A output current
Operating input range VIN = 6.5V31V
Output adjustable VO= 0.8V24V
Fixed 350kHz frequency
Applications
LCD TV / Blu-Ray / Set top box
Home appliance
Green Electronic products
Other power supply
Package
Typical Application Circuit
VIN R3
VIN_s
C2 C1
GND
2
R1 IN
7
EN
C10
1
BS 3
SW
L1
NR11111DE
R5
8
SS
GND
5
FB
ISET
R4
46
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.
http://www.sanken-ele.co.jp
1
http://www.Datasheet4U.com

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