NR111D

Light Load High Efficiency ,31V, Current Mode Step-Down 4A Switcing Regulator IC
NR111D
Sep./15/2015
 DIP8 Package
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.
BS
IN





EN
NR111D
Features & Benefits


SS
SW
Iset
GND
FB
Electrical Characteristics
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




4A output current
Operating input range VIN = 6.5V～31V
Output adjustable VO= 0.8V～24V
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
2
IN
R1
7
C2
EN
C1
C10
SW
3
SS
GND
4
Vo
L1
Vo_s
NR111D
NR111E
8
GND
1
BS
R5
FB
ISET
6
C4 C5
5
R4
GND
C9
R6
R7
D1
SW
C1, C2: 10μF / 35V
C4, C5: 22μF / 16V
C9: 0.1μF
C10: 0.1μF
Rev.1.4
R1: 510kΩ
L1: 10μH
R3: 22Ω
R4: 18kΩ, R5: 2.7kΩ (Vo=5.0V)
R6: 3.9kΩ
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1
Light Load High Efficiency ,31V, Current Mode Step-Down 4A Switcing Regulator IC
NR111D
Sep./15/2015
Series Lineup
(1)
Product No.
fSW
NR111D
350kHz
VIN
VO
(1)
8V to 31V
IO
(2)
0.8V to 24V
4A
The minimum input voltage shall be either of 6.5V or VO+3V, whichever is higher.
The I/O condition is limited by the Minimum on-time (TON(MIN)).
(2)
Absolute Maximum Ratings
項目
記号
規格値
単位
DC input voltage
VIN
35
V
BS Pin voltage
VBS
44
V
8
VBS-SW
BS-SW Pin voltage
DC
V
12
SW Pin voltage
VSW
35
V
FB Pin voltage
VFB
5.5
V
EN Pin voltage
VEN
35
V
SS Pin voltage
VSS
5.5
V
Pulse width ≦30ns
Glass-epoxy board mounting
in a 70×60mm.
(copper area in a 1310mm2)
Max TJ =150°C
Power dissipation
(3)
PD
1.47
W
Junction temperature
(4)
TJ
30 to 150
°C
Storage temperature
TS
40 to 150
°C
Thermal resistance
(junction- Pin No. 7)
θJP
41
°C /W
Thermal resistance
(junction-ambient air)
θJA
85
°C /W
(3)
(4)
条件
Glass-epoxy board mounting
in a 70×60mm.
(copper area in a 1310mm2)
Limited by thermal shutdown.
The temperature detection of thermal shutdown is about 160°C
Recommended Operating Conditions
Parameter
DC input voltage
Symbol
(5)
Ratings
Units
MIN
MAX
VIN
Vo+3
31
V
Io
0
4.0
A
Vo
0.8
24
V
Conditions
(6)
DC output current
(7)
Output voltage
Ambient operating temperature
Top
85
°C
40
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)
(7)
(5)
Rev.1.4
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2
Light Load High Efficiency ,31V, Current Mode Step-Down 4A Switcing Regulator IC
NR111D
Sep./15/2015
Electrical Characteristics
Ta = 25°C
Parameter
Symbol
Reference voltage
Output voltage temperature
coefficient
Switching frequency
Ratings
MIN
TYP
MAX
VREF
0.784
0.800
0.816
⊿VREF/⊿T
―
±0.05
―
fSW
280
350
420
Units
Test conditions
V
VIN = 12V，IO = 1.0A
V = 12V, IO = 1.0A
mV/°C IN
40°C to +85°C
VIN=12V, VO=5.0V,
kHz
IO=1A
VIN=8V～31V, VO =5.0V,
mV
IO=1A
VIN=12V, VO=5.0V,
mV
IO=0.1A～2.0A
VIN =12V, VO =5.0V
ISET=OPEN
A
VIN =12V, VO =5.0V
ISET=SHORT
VIN = 12V
mA
VEN=10kΩ pull up to VIN
VIN =12V, IO =0A,
μA
VEN=0V
Line regulation
(8)
VLine
―
50
―
Load regulation
(8)
VLoad
―
50
―
IS1
―
1.5
―
IS2
―
5.5
―
IIN
―
1
―
IIN(off)
0
1
―
IEN/SS
6
10
14
μA
VSS=0V, VIN =12V
20
50
μA
VEN= 10V
1.4
2.1
V
VIN =12V
V
VIN =12V
Overcurrent protection
threshold
Supply Current
Shutdown Supply Current
SS Pin
EN Pin
ISET Pin
Max on-duty
Source current
at low level
voltage
Sink current
IEN
Threshold voltage
VC/EH
Open voltage
VISET
(8)
(8)
DMAX
0.7
1.5
―
Minimum on-time
TON(MIN)
―
Thermal shutdown threshold
(8)
TSD
151
temperature
Thermal shutdown
(8)
restart hysteresis
TSD_hys
―
of temperature
(8)
Guaranteed by design,not tested.
The input and output condition is limited by Minimum on-time.
Rev.1.4
90
―
%
150
―
nsec
165
―
°C
20
―
°C
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3
Light Load High Efficiency ,31V, Current Mode Step-Down 4A Switcing Regulator IC
NR111D
Sep./15/2015
Typical characteristics
(1)Efficiency
NR111D
Vo=3.3V
100
η [%]
Efficiency
90
80
VIN=6.5V
8V
12V
24V
70
60
50
40
30
0.01
0.1
1
Output current
NR111D
10
IO [A]
Vo=5V
100
90
η [%]
Efficiency
80
VIN=8V
12V
24V
70
60
50
40
30
0.01
0.1
Output current
1
10
IO [A]
NR111D Vo=12V
100
90
η [%]
Efficiency
80
VIN=24V
70
60
50
0.01
0.1
Output current
Rev.1.4
1
10
IO [A]
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4
Light Load High Efficiency ,31V, Current Mode Step-Down 4A Switcing Regulator IC
NR111D
Sep./15/2015
NR114K
UVLO
(2)Output
start-up
Load=CR
NR110K/111K
OCP.
(5)Over
current
protection
Vo=3.3V L=47uH
Vo=5.0V L=10uH
VO=3.3V
Output voltage
Vo [V] VO [V]
Output voltage
VO[V] VO [V]
7.0
6.5
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
6.00
5.50
5.00
4.50
4.00
3.50
3.00
2.50
2.00
1.50
1.00
0.50
0.00
ISET=OPEN
0.0
4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0
1.0
2.0
ISET=SHORT
3.0
4.0
5.0
6.0
7.0
VIN=12V
15V
20V
24V
8.0
9.0
Output current
Io [A] IO [A]
Input voltage
VIN[V] VIN [V]
(3)Load Regulation : VLoad
(6) Supply current : IIN
NR114K/115K,NR116K,NR117K
IQ
At No-load
V =5.0V
O
5.0
5.1
4.5
Input current Iin [mA]
Output voltage VO [V]
5.08
Vin=8v
12v
24v
5.06
5.04
Iin [mA]
5.02
5
4.98
4.96
4.94
4.92
4.9
0
1
2
3
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
4
0.0
Output current IO [A]
5.0
10.0
(4)Shut down supply current : IIN(off)
Frequency
fosc [kHz] fOSC [kHz]
current
Input Iin
[mA] Iin [mA]
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
-0.05
-0.10
10.0
15.0
30.0
20.0
25.0
30.0
500
480
460
440
420
400
380
360
340
320
300
280
260
240
220
200
0.0
1.0
Input voltage
VIN[V] VIN [V]
Rev.1.4
25.0
NR110K focs
Vo=3.3V L=10uH
0.40
5.0
20.0
(7) Switching Frequency : fsw
NR110K,111K,114K,115K,116K,117K
VENIQ_off
=0V
0.0
15.0
VIN[V] VIN [V]
Input voltage
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2.0
3.0
4.0
5.0
OutputIo current
IO [A]
[A]
5
Light Load High Efficiency ,31V, Current Mode Step-Down 4A Switcing Regulator IC
NR111D
Sep./15/2015
Functional Block Diagram
VIN
2
R1
Σ
OSC
7
３
EN
ON/
OFF
P.REG
VREF
6
ISET
C1
IN
C2
D2
（ Option)
Current
Sense
Amp
OCP
６
Drive
REG
1
BS
OCP_REF
0.8V
PWM
LOGIC
７
５
４
3
R3
C10
L1
SW
R5
OCP_REF
D1
ISET
OVP
C4
C5
R4
Compensation
FB
VO
FB
0.8V
Err Amp
８
5
FB
UVLO
R6
SS
TSD
１
SS
GND 4
１
8
C9
Pin Assignment & Functions
Pin Assign
Pin Assign & Functions
Pin
Symbol
No.
Description
High-side Boost input. BS supplies the drive for High-side Nch-MOSFET switch.
Connect a capacitor and a resistor between SW to BS.
Power input. IN supplies the power to the IC as well as the regulator switches
1
BS
2
IN
3
SW
4
GND
5
FB
6
Iset
7
EN
Feedback input Pin to compare Reference Voltage. The feedback threshold is 0.8V.
To set the output voltage, FB Pin is required to connect between resistive voltage divider R4
and R6.
Adjust Pin of OCP starting current.OCP starting current can be adjusted by connecting a resistor to
ISET Pin.In the case of using at Maximum Io, ISET Pin is required to connect to GND.
Enable input. Drive EN Pin high to turn on the regulator, low to turn it off.
8
SS
Soft-Start control input. To set the soft-start period, connect to a capacitor between GND.
Rev.1.4
Power switching output.SW supplies power to the output.
Connect the LC filter from SW to the output.
Note that a capacitor is required from SW to BS to supply the power the High-side switch
Ground.Connect the exposed pad to Pin No.4
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6
Light Load High Efficiency ,31V, Current Mode Step-Down 4A Switcing Regulator IC
NR111D
Sep./15/2015
Example Application Circuit
VIN
R3
VIN_s
2
IN
R1
7
C2
EN
C1
8
1
BS
NR111D
NR111E
SS
GND
4
C10
3
SW
Vo
L1
Vo_s
R5
C4 C5
5
FB
ISET
6
R4
GND
C9
GND
R6
R7
D1
SW
C1, C2: 10μF / 35V
C4, C5: 22μF / 16V
C9: 0.1μF
C10: 0.1μF
R1: 510kΩ
L1: 10μH
R3: 22Ω
R4: 18kΩ, R5: 2.7kΩ (Vo=5.0V)
R6: 3.9kΩ
A design guide of External Components
(1)Diode D1
・The schottky-barrier diode must be used for D1. If other diodes like fast recovery diodes are used, IC may be
destroyed because of the reverse voltage applied by the recovery voltage or ON voltage.
(2)Choke coil L1
・If the winding resistance of the choke coil is too high, the efficiency may go down to the extent that it is out of the
rating.
・As the start current of the over current protection is approximately 4A,
attention must be paid to the heating of the choke coil
by the magnetic saturation due to overload or short-circulated load.
(3)Capacitor C1( C2), C4(C5), C9
・As large ripple currents across C1 (C2) and C4 (C5), capacitors with high frequency and low impedance for SMPS
must be used. Especially when the impedance of C4 (C5) is high, the switching waveform may not be normal at low
temperature.
・C9 is a capacitor for soft start. In case soft start function is not used, please keep Pin No.2 open.
(4)Resistor R4, R5,R6
・R4, R5, R6 are resistor to the Output Voltage. IADJ is required to set to 0.2mA.
R4, R5, R6 are calculated by the equation (1).
R 4  R5 
VO  VFB  VO  0.8
I FB

0.2  10
3
 ， R6  VFB
I FB

0.8
≒ 4.0k   ------- (1)
0.2  10 3
IFB:The electric current which flows to R6
Rev.1.4
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7
Light Load High Efficiency ,31V, Current Mode Step-Down 4A Switcing Regulator IC
NR111D
Sep./15/2015
(5)Resistor R7
・R7 is resistor to adjust OCP starting
current .
RISET-ILpeak
The graph shows the relationship between R7 and OCP .
The OCP output current is calculated in terms of the equation (2),(3),(4)。
設定値_MAX
Inductor peak current Ip[A]
current Protection
at Over
過電流開始ピーク電流
[A]
8.00
VIN：Input voltage
Vo：Output voltage
Io：Output
current
設定値_MIN
L：Inductance
f：Switching Frequency
⊿IL：Inductor ripple current
Ip：Inductor peak current
at Over current protection
7.00
6.00
5.00
4.00
3.00
2.00
1.00
0.00
10k
10
100k
100
1M
1000
10M
10000
100M
100000
OCP Adjust resistance value RISET[Ω]
過電流開始電流
設定抵抗Rset [kΩ]
*Ip becomes the peak value of inductor ripple current. Calculate it in accordance with the following
equation.
In case of continuous inductor current･･･ ⊿IL  Ip－ ⊿IL
２
In case of discontinuous inductor current･･･ Io 
------- (2)
VIN  L ｆ
 2  Vo  (VIN - Vo )
 Ip２ 
１
２ ⊿IL
 Ip２
------ (3)
*Inductor ripple current ････ ⊿IL 
Vo
Vo
 (1 ） ------- (4)
L ｆ
VIN
In order to have optimum operating condition, each component must be connected with the minimum distance.
Rev.1.4
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8
Light Load High Efficiency ,31V, Current Mode Step-Down 4A Switcing Regulator IC
NR111D
Sep./15/2015
Allowable package power dissipation
1.6
許容損失 PD[W]
Power Dissipation
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
-25
0
25
50
75
100
125
周囲温度 Ta[℃]
Ambient Temperature
NOTES:
1) Glass-epoxy board mounting in a 30×30mm
2) copper area : 25×25mm
3) The power dissipation is calculated at the junction temperature 125 °C
4) Losses can be calculated by the following equation.
As the efficiency is subject to the input voltage and output current, it shall be obtained from the efficiency curve and
substituted in percent
5) Thermal design for D1 shall be made separately.

 100 
V
PD  VO  I O 
 1  VF  I O 1  O
 x

 VIN




VO: Output voltage
VIN: Input voltage
IO: Output current
ηx: Efficiency(%)
VF: Diode forward voltage
SJPB-L4…0.55V(IO=3A)
Rev.1.4
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9
Light Load High Efficiency ,31V, Current Mode Step-Down 4A Switcing Regulator IC
NR111D
Sep./15/2015
PCB layout recommendation
*The demonstration Printed circuit board. It can mount a part for the experiment ,except for the Example Application Circuit.
Front Side: Component Side (double sided board)
Back Side: GND Side (double sided board)
Note
1) Size of the PCB is about 40mm × 40mm
2)Dimension is in millimeters, dimension in bracket is in inches.
3) Drawing is not to scale.
8×φ0.8
(Reference)
DIP8 package
About the position of the lead-insertion hole
Rev.1.4
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10
Light Load High Efficiency ,31V, Current Mode Step-Down 4A Switcing Regulator IC
NR111D
Sep./15/2015
Package outline & Dimension
An outside size is supplied by either Package type A or
Package
Package type B.
A
9.4±0.127
NR111D
*4
SK
*2
*1
6.35±0.127
*3
（1.524）
（1.524）
（1.524）
7.938±0.3175
6.35±0.127
0.2032~0.3810
3.302±0.127
0.381min
3.302±0.254
0.356~0.559
8.636±0.762
（2.54）
Mariking
PIN Assignment
1.NC
2.IN
3.SW
4.GND
5.FB
6.EN
7.SS
8.BS
*1. Type number
*2. Lot number (three digit)
1st letter: The last digit of year
2nd letter: Month
(1 to 9 for Jan. to Sept.,
O for Oct. N for Nov. D for Dec.)
3rd
letter
week
01～03：Arabic Numerical
Note:
1) Dimension is in millimeters.
2) Drawing is not to scale.
Rev.1.4
*3. Control number (four digit)
*4 .Logo: SK
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11
Light Load High Efficiency ,31V, Current Mode Step-Down 4A Switcing Regulator IC
NR111D
Package
Sep./15/2015
B
9.2±0.2
NR111D
*1
*2
*4
6.4±0.2
SK
*3
7.62±0.3
0.282±0.078
(2.54)
3.4±0.2
4.01±0.3
3.3±0.3
0.51min
0.475±0.095
8.7±0.3
(1.524)
PIN Assignment
1.NC
2.IN
3.SW
4.GND
5.FB
6.EN
7.SS
8.BS
Marking
*1. Type number
*2. Lot number (three digit)
1st letter: The last digit of year
Note:
1) Dimension is in millimeters.
2) Drawing is not to scale.
2nd letter: Month
(1 to 9 for Jan. to Sept.,
O for Oct. N for Nov. D for Dec.)
3rd letter
week
01～03：Arabic Numerical
*3. Control number (four digit)
*4 .Logo: SK
Rev.1.4
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12
Light Load High Efficiency ,31V, Current Mode Step-Down 4A Switcing Regulator IC
NR111D
Sep./15/2015
OPERATING PRECAUTIONS
Reliability can be affected adversely by improper storage environments and handling methods. Please observe the
following cautions.
Heat dissipation and reliability
Thermal performance of the surface mo unt package IC depends on the material and area size of PCB and its copper
plane. Design thermal condition with sufficient margin
Parallel operation
The parallel operation to increase the current is not available.
Thermal shut down
The NR111D has a thermal protection circuit.
This circuit protects the IC from the heat generation by the over load.
This circuit cannot guarantee the long-term reliability against the continuously over load status.
Cautions for Storage
 Ensure that storage conditions comply with the standard temperature (5 to 35°C) and the standard relative humidity
(around 40 to 75%); avoid storage locations that experience extreme changes in temperature or humidity.
 Avoid locations where dust or harmful gases are present and avoid direct sunlight.
 Reinspect for rust on leads and solderability of products that have been stored for a long time.
Cautions for Testing and Handling
 When tests are carried out during inspection testing and other standard test periods, protect the products from power
surges from the testing products, shorts between the product pins, and wrong connections. In addition, avoid tests
exceeded ratings
Soldering
When soldering the products, please be sure to minimize the working time, within the following limits.
・Reflow Preheat ; 180°C / 90±30s
Heat ; 250°C / 10±1s (260°C peak ,2times)
・Soldering iron ; 380±10°C / 3.5±0.5s (1time)
Electrostatic Discharge
 When handling the products, the operator must be grounded. Grounded wrist straps worn should have at least 1MΩ of
resistance from the operator to ground to prevent shock hazard, and it should be placed near the operator.
 Workbenches where the products are handled should be grounded and be provided with conductive table and floor mats.
 When using measuring equipment such as a curve tracer, the equipment should be grounded.
 When soldering the products, the head of a soldering irons or the solder bath must be grounded in order to prevent leak
voltages generated by them from being applied to the products.
 The products should always be stored and transported in Sanken shipping containers or conductive containers, or be
wrapped in aluminum foil.
Rev.1.4
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13
Light Load High Efficiency ,31V, Current Mode Step-Down 4A Switcing Regulator IC
NR111D
Sep./15/2015
IMPORTANTS NOTES
 The contents in this document are subject to changes, for improvement and other purposes, without notice.
Make sure that this is the latest revision of the document before use.
 Application and operation examples described in this document are quoted for the sole purpose of reference for
the use of the products herein and Sanken can assume no responsibility for any infringement of industrial
property rights, intellectual property rights or any other rights of Sanken or any third party which may result
from its use.
 Although Sanken undertakes to enhance the quality and reliability of its products, the occurrence of failure and
defect of semiconductor products at a certain rate is inevitable. Users of Sanken products are requested to take,
at their own risk, preventative measures including safety design of the equipment or systems against any
possible injury, death, fires or damages to the society due to device failure or malfunction.
 Sanken products listed in this document are designed and intended for the use as components in general purpose
electronic equipment or apparatus (home appliances, office equipment, telecommunication equipment,
measuring equipment, etc.).
When considering the use of Sanken products in the applications where higher reliability is required
(transportation equipment and its control systems, traffic signal control systems or equipment, fire/crime alarm
systems, various safety devices, etc.), please contact your nearest Sanken sales representative to discuss, prior to
the use of the products herein.
The use of Sanken products without the written consent of Sanken in the applications where extremely high
reliability is required (aerospace equipment, nuclear power control systems, life support systems, etc.) is strictly
prohibited.
 In the case that you use Sanken semiconductor products or design your products by using Sanken
semiconductor products, the reliability largely depends on the degree of derating to be made to the rated values.
Derating may be interpreted as a case that an operation range is set by derating the load from each rated value or
surge voltage or noise is considered for derating in order to assure or improve the reliability. In general, derating
factors include electric stresses such as electric voltage, electric current, electric power etc., environmental
stresses such as ambient temperature, humidity etc. and thermal stress caused due to self-heating of
semiconductor products. For these stresses, instantaneous values, maximum values and minimum values must
be taken into consideration.
In addition, it should be noted that since power devices or IC’s including power devices have large self-heating
value, the degree of derating of junction temperature affects the reliability significantly.
 When using the products specified herein by either (i) combining other products or materials therewith or (ii)
physically, chemically or otherwise processing or treating the products, please duly consider all possible risks
that may result from all such uses in advance and proceed therewith at your own responsibility.
 Anti radioactive ray design is not considered for the products listed herein.
 Sanken assumes no responsibility for any troubles, such as dropping products caused during transportation out
of Sanken’s distribution network.
 The contents in this document must not be transcribed or copied without Sanken’s written consent.
Rev.1.4
SANKEN ELECTRIC CO., LTD.
http://www.sanken-ele.co.jp
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