NR111E Datasheet, PDF (1/13 Pages) Sanken electric – Light Load High Efficiency

Light Load High Efficiency, 31V, Buck Regulator
NR110E series
General Descriptions
The NR110E series is buck regulator ICs integrates
High-side power MOSFET. 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 NR110E 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
Oct/23/2012
Features & Benefits
 Current mode PWM control
 Up to 94% Efficiency,
Up to 68% Efficiency at I_O = 20mA Light Load
 Adjustable “Over Current Protection（OCP）”
 Current mode PWM control
 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
 Operating input range V_IN = 6.5V～31V
 Output adjustable V_O= 0.8V～24V
 2A / 4A output current
 Fixed 350kHz frequency
Applications
 LCD TV / Blu-Ray / Set top box
 Home appliance
 Green Electronic products
 Other power supply
Typical Application Circuit
VIN
VIN_s
R1
C2
C1
GND
C9
R3
2
IN
7
EN
C10
1
BS
3
L1
SW
NR111E
R5
8
SS
GND
5
FB
ISET
R4
4
6
R7
R6
D1
Vo
Vo_s
C4 C5
GND
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
Rev.1.0
SANKEN ELECTRIC CO., LTD.
1
http://www.sanken-ele.co.jp