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NR111D Datasheet Preview

NR111D Datasheet

Step-Down 4A Switcing Regulator

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Light Load High Efficiency,31V, Current Mode Step-Down 4A Switcing Regulator IC
NR111D
Jan./05/2016
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 90% Efficiency,(VIN=12V,Vo=5V,Io=1A)
Up to 68% Efficiency,(VIN=12V,Vo=5V,Io=20mA)
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
SS
IN
EN
NR111D
SW
Iset
GND
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
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: 510kΩ
L1: 10μH
R3: 22Ω
R4: 18kΩ, R5: 2.7kΩ (Vo=5.0V)
R6: 3.9kΩ
Vo
Vo_s
C4 C5
GND
Rev.1.5
SANKEN ELECTRIC CO., LTD.
1
http://www.sanken-ele.co.jp




SANKEN

NR111D Datasheet Preview

NR111D Datasheet

Step-Down 4A Switcing Regulator

No Preview Available !

Light Load High Efficiency,31V, Current Mode Step-Down 4A Switcing Regulator IC
NR111D
Jan./05/2016
Series Lineup
Product No.
fSW
VIN
VO
IO
NR111D
350kHz
8V to 31V
(1)
0.8V to 24V
(2)
4A
(1)The minimum input voltage shall be either of 6.5V or VO+3V, whichever is higher.
(2) The I/O condition is limited by the Minimum on-time (TON(MIN)).
Absolute Maximum Ratings
項目
記号
DC input voltage
VIN
BS Pin voltage
VBS
BS-SW Pin voltage
VBS-SW
SW Pin voltage
VSW
FB Pin voltage
VFB
EN Pin voltage
VEN
SS Pin voltage
VSS
Power dissipation
(3)
PD
Junction temperature
Storage temperature
(4)
TJ
TS
規格値
35
44
8
12
35
5.5
35
5.5
1.47
30 to 150
40 to 150
単位
V
V
V
V
V
V
V
W
°C
°C
条件
DC
Pulse width 30ns
Glass-epoxy board mounting
in a 70×60mm.
(copper area in a 1310mm2)
Max TJ =150°C
Thermal resistance
(junction- Pin No. 7)
θJP
41
°C /W
Thermal resistance
(junction-ambient air)
θJA
85
(3) Limited by thermal shutdown.
(4) The temperature detection of thermal shutdown is about 160°C
Glass-epoxy board mounting
°C /W in a 70×60mm.
(copper area in a 1310mm2)
Recommended Operating Conditions
Parameter
DC input voltage
DC output current
Symbol
(5)
VIN
(6)
(7)
Io
Ratings
MIN
MAX
Vo+3
31
0
4.0
Units
V
A
Conditions
Output voltage
Vo
0.8
24
V
Ambient operating temperature
(7)
Top
40
85
°C
(5) The minimum value of input voltage is taken as the larger one of either 6.5V or Vo +3V.
(6) Recommended circuit refer to Typical Application Circuit (P.7).
(7) To be used within the allowable package power dissipation characteristics (P.9)
Rev.1.5
SANKEN ELECTRIC CO., LTD.
2
http://www.sanken-ele.co.jp


Part Number NR111D
Description Step-Down 4A Switcing Regulator
Maker SANKEN
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