1.5 A, 31 V, 30 kHz, Buck Converter
NR117K
Description
The NR117K is buck converter ICs that integrate the
power MOSFET. With the current mode control, ultra
low ESR capacitors such as ceramic capacitors can be
used. The ICs have protection functions such as
Overcurrent Protection (OCP), Under-Voltage Lockout
(UVLO) and Thermal Shutdown (TSD). An adjustable
Soft-Start by an external capacitor prevents the
excessive inrush current in startup. The feature
increasing efficiency at light loads allows the device to
be used in the energy-saving applications. The ICs
integrate phase compensation circuit which reduces the
number of external components and simplifies the
design of customer application. The IC has the EN pin
that turns the regulator on or off, and achieves low
power consumption requirements. The package of
NR117K is the HSOP8 with an exposed thermal pad on
the back side.
Data Sheet
Package
HSOP8
1
2
3
4
8
7
6
5
Features
● Up to 87% Efficiency
(V
IN
= 12 V, V
O
= 5 V, I
O
= 0.3 A)
Up to 68% Efficiency at Maximum at Ligh Load
(V
IN
= 12 V, V
O
= 5 V, I
O
= 10 mA)
● Current mode PWM control
● Stable with Low ESR Ceramic Output Capacitors
● No External Components Required by Incorporating
Phase Compensation
● Soft-Start Function
Adjustable Soft-Start time with an External Capacitor
● External ON/OFF Function
● Frequency: 30kHz (EMI considered)
● Protection Functions:
● Overcurrent Protection (OCP): Drooping, auto-restart
Thermal Shutdown (TSD): Auto-restart
Under Voltage Lockout (UVLO)
Not to scale
Specification
●
●
●
●
Input Voltage, V
IN
= 8 V to 31 V
Output Voltage, V
O
= 0.8 V to 24 V
Maximum Output Current, I
O
= 1.5 A
Operation Frequency 30 kHz
Application
● AV Equipment
● Auxiliary Power Supply
Typical Application
NR117K-DSE Rev.2.1
SANKEN ELCTRIC CO.,LTD.
Apr. 20, 2018
http://www.sanken-ele.co.jp/en
© SANKEN ELECTRIC CO., LTD. 2016
1
NR117K
Contents
Description ------------------------------------------------------------------------------------------------------ 1
Contents --------------------------------------------------------------------------------------------------------- 2
1. Absolute Maximum Ratings ----------------------------------------------------------------------------- 3
2. Recommended Operating Conditions ----------------------------------------------------------------- 3
3. Electrical Characteristics -------------------------------------------------------------------------------- 4
4. Typical Performance Characteristics ----------------------------------------------------------------- 4
5. Block Diagram --------------------------------------------------------------------------------------------- 6
6. Pin Configuration Definitions --------------------------------------------------------------------------- 6
7. Typical Application --------------------------------------------------------------------------------------- 7
8. Physical Dimensions -------------------------------------------------------------------------------------- 7
9. Marking Diagram ----------------------------------------------------------------------------------------- 8
10. Operational Description --------------------------------------------------------------------------------- 9
10.1. PWM Output Control ------------------------------------------------------------------------------ 9
10.2. Soft Start Function -------------------------------------------------------------------------------- 10
10.3. External ON/OFF Function --------------------------------------------------------------------- 10
10.4. Overcurrent Protection -------------------------------------------------------------------------- 11
10.5. Thermal Shutdown -------------------------------------------------------------------------------- 11
11. Design Notes ---------------------------------------------------------------------------------------------- 12
11.1. External Components ---------------------------------------------------------------------------- 12
11.1.1. Choke Coil, L1 ------------------------------------------------------------------------------- 12
11.1.2. Input Capacitor, C
IN
------------------------------------------------------------------------ 13
11.1.3. Output Capacitor, C
OUT
-------------------------------------------------------------------- 13
11.1.4. Freewheel Diode, D1 ------------------------------------------------------------------------ 14
11.1.5. Output Voltage, V
O
, and Output Capacitor -------------------------------------------- 15
11.2. Allowable power dissipation -------------------------------------------------------------------- 15
11.2.1. Power Supply Stability --------------------------------------------------------------------- 15
11.2.2. Spike Noise Reduction ---------------------------------------------------------------------- 15
11.2.3. Reverse Bias Condition --------------------------------------------------------------------- 16
11.3. Pattern Layout ------------------------------------------------------------------------------------- 17
11.3.1. Large Current Trace ----------------------------------------------------------------------- 17
11.3.2. Input and Output Capacitor -------------------------------------------------------------- 17
11.3.3. FB Pin Setting (Output Voltage Setting) ------------------------------------------------ 17
12. Pattern Layout Example ------------------------------------------------------------------------------- 18
Important Notes ---------------------------------------------------------------------------------------------- 19
NR117K-DSE Rev.2.1
SANKEN ELCTRIC CO.,LTD.
Apr. 20, 2018
http://www.sanken-ele.co.jp/en
© SANKEN ELECTRIC CO., LTD. 2016
2
NR117K
1.
Absolute Maximum Ratings
Unless otherwise specified, T
A
= 25 °C.
Parameter
Symbol
DC Input Voltage
BS Pin Voltage
BS–SW Voltage
SW Pin Voltage
FB Pin Voltage
EN Pin Voltage
SS Pin Voltage
V
IN
V
BS
V
BS-SW
V
SW
V
FB
V
EN
V
SS
The IC is mounted on the
glass-epoxy board (30 ×
30mm) with copper area
25 × 25mm)
T
J
Max = 150 °C
DC
Pulse width
≤
30ns
Conditions
Rating
35
44
8
12
35
5.5
35
5.5
Unit
V
V
V
V
V
V
V
Remarks
Power Dissipation
(1)
P
D
1.69
W
Junction Temperature
(2)
Storage Temperature
Thermal Resistance
(junction–GND Pin)
Thermal Resistance
(junction–ambient air)
(1)
(2)
T
J
T
S
θ
JP
θ
JA
The IC is mounted on the
glass-epoxy board (30 ×
30mm) with copper area
(25 × 25 mm)
40
to 150
40
to 150
40
°C
°C
°C /W
70
°C /W
Limited by thermal shutdown.
The temperature detection of thermal shutdown is about 160 °C.
2.
Recommended Operating Conditions
Parameter
Symbol
V
IN
I
O
V
O
T
OP
Ratings
Min.
8
0
0.8
40
Max.
31
1.5
24
85
Units
V
A
V
°C
Conditions
DC Input Voltage
(1)
DC Output Current
(2)(3)
Output Voltage
Ambient Operating
(3)
Temperature
(1)
The minimum value of input voltage is taken as the larger one of either 8 V or V
O
+3 V.
When I
O
< 1 A, V
IN
= V
O
+ 1.
Input voltage is limited by the maximum ON duty. V
IN
> V
O
/ 0.9 (typ.)
(2)
See Typical Application Circuit for recommended circuit.
(3)
To be used within the allowable package power dissipation characteristics.
NR117K-DSE Rev.2.1
SANKEN ELCTRIC CO.,LTD.
Apr. 20, 2018
http://www.sanken-ele.co.jp/en
© SANKEN ELECTRIC CO., LTD. 2016
3
NR117K
3.
Electrical Characteristics
Unless otherwise specified, T
A
= 25 °C.
Parameter
Symbol
Reference Voltage
Output Voltage Temperature
Coefficient
Switching Frequency
Line Regulation
(4)
Load Regulation
(4)
Overcurrent Protection
Threshold
Supply Current
Shutdown Supply Current
SS Pin
EN Pin
Source current at
Low Level Voltage
Sink Current
Threshold Voltage
V
REF
ΔV
REF
/ΔT
f
OSC
V
Line
V
Load
I
S1
I
S2
I
IN
I
IN(off)
I
EN/SS
I
EN
V
C/EH
D
MAX
t
ON(MIN)
TSD
TSD_hys
R
ON(H)
Conditions
V
IN
= 12 V, I
O
= 0.3 A
V
IN
= 12 V, I
O
= 0.3 A
40
°C to +85 °C
V
IN
= 12 V, I
O
= 0.3 A
V
IN
= 8 V to 31 V,
V
O
= 5 V, I
O
= 0.3 A
V
IN
= 12 V, V
O
= 5 V,
I
O
= 0.1 A to 0.3 A
V
IN
= 12 V, V
O
= 5 V,
R
ISET
= 1MΩ
V
IN
= 12 V, V
O
= 5 V,
ISET = GND
V
IN
= 12 V, V
O
= 5 V,
I
O
= 0 A
V
IN
= 12 V, V
O
= 5 V,
I
O
= 0 A, V
EN
= 0 V
V
SS
= 0 V, V
IN
= 12 V
V
EN
= 10 V
V
IN
= 12 V
Min.
0.784
―
21
―
―
―
―
―
―
6
―
0.7
―
―
151
―
―
Typ.
0.800
±0.05
30
50
50
0.3
2.1
1
1
10
20
1.4
90
150
165
20
150
Max.
0.816
―
39
―
―
―
―
―
―
14
50
2.1
―
―
―
―
―
Unit
V
mV/°C
kHz
mV
mV
A
A
mA
μA
μA
μA
V
%
ns
°C
°C
mΩ
Max On-duty
(4)
Minimum On-time
(4) (5)
Thermal Shutdown Threshold
Temperature
(4)
Thermal Shutdown Restart
Hysteresis of Temperature
(4)
High-side Switch ON
Resistance
(4)
(4)
(5)
Guaranteed by design, not tested.
Input/ Output conditions are controlled by the minimum ON time.
4.
100
Typical Performance Characteristics
NR117K EFF Vo=3.3
100
NR117K EFF
Vo=5.0
eff [%]
Efficiency, η (%)
80
Efficiency, η (%)
90
90
80
70
70
60
V
IN
=10V
12V
15V
18V
24V
60
50
V
IN
=10V
12V
15V
18V
24V
50
40
0.01
eff [%]
1.00
10.00
0.10
40
0.01
0.10
1.00
10.00
Io [A]
Output Current, I
O
(A)
Io [A]
Output Current, I
O
(A)
Figure 4-1.
Efficiency (Vo = 3.3 V)
Figure 4-2.
Efficiency (Vo = 5.0 V)
NR117K-DSE Rev.2.1
SANKEN ELCTRIC CO.,LTD.
Apr. 20, 2018
http://www.sanken-ele.co.jp/en
© SANKEN ELECTRIC CO., LTD. 2016
4
NR117K
NR117K(30kHz) UVLOVo=5V L=150uH Ta=RT
6.0
NR117K OCP.
Vo=5.0V L=47uH
Output Voltage, V
O
(
V)
5.0
4.0
3.0
2.0
1.0
0.0
Output Voltage, V
O
(V)
6.00
5.00
4.00
3.00
2.00
1.00
V
IN
=10V
12V
15V
18V
24V
V
IN
=10V
12V
15V
18V
24V
Vo [V]
Vo [V]
RISET= 1000kΩ
0.0
0.5
1.0
1.5
RISET=0Ω (GND)
2.0
2.5
3.0
0.00
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
Output Current, I
O
(A)
Io [A]
Figure 4-4.
Overcurrent Protection
Input Voltage, V
IN
(V)
VIN[V]
Figure 4-3.
Output Startup (Load = CR)
Ta=25℃
NR885K(500kHz)LoadReg.Vo=3.3V L=10uH
NR114K/115K,NR116K,NR117K IQ
Output Voltage, V
O
(V)
Vo [V]
Input Current, I
IN
(mA)
5.100
5.080
5.060
5.040
5.020
5.000
4.980
4.960
4.940
4.920
4.900
0.0
0.5
1.0
1.5
2.0
V
IN
=10V
12V
15V
18V
24V
5.0
4.5
4.0
3.5
3.0
2.5
Iin [mA]
2.0
1.5
1.0
0.5
0.0
0.0
5.0
10.0
15.0
20.0
25.0
30.0
Output Current, I
O
(A)
Io [A]
Figure 4-5.
Load Regulation
Figure 4-6.
Input Voltage, V
IN
(V)
VIN[V]
IN Pin Sink Current at No Load
NR110K focs Vo=3.3V L=10uH
40
38
36
34
32
30
28
26
24
22
20
0.0
0.2
0.4
0.6
0.8
Io [A]
1.0
1.2
1.4
1.6
NR110K,111K,114K,115K,116K,117K
IQ_off
0.40
Input Current, I
IN
(mA)
0.35
0.25
0.20
0.15
Frequency (kHz)
fosc [kHz]
0.30
0.10
0.05
0.00
V
IN
=10V
12V
15V
18V
24V
Iin [mA]
-0.05
-0.10
0.0
5.0
10.0
15.0
20.0
25.0
30.0
Input Voltage, V
IN
(V)
VIN[V]
Output Current, I
O
(A)
Figure 4-7.
Quiescent Current
Figure 4-8.
Operating Frequency
NR117K-DSE Rev.2.1
SANKEN ELCTRIC CO.,LTD.
Apr. 20, 2018
http://www.sanken-ele.co.jp/en
© SANKEN ELECTRIC CO., LTD. 2016
5
无线连接
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
