SI-8150S [SANKEN]
Full-Mold, Separate Excitation Switching Type; 全模具，独立的励磁开关类型
| 型号： | SI-8150S |
| 厂家： | 
SANKEN ELECTRIC |
| 描述： | Full-Mold, Separate Excitation Switching Type |
| 文件： | 总6页 (文件大小：66K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
●SI-8000S Series
SI-8000S Series
Full-Mold, Separate Excitation Switching Type
■Features
• Compact full-mold package (equivalent to TO220)
• Output current: 3.0A
• High efficiency: 79 to 91%
• Requires only 4 external components
• Phase correction and output voltage adjustment performed internally
• Built-in reference oscillator (60kHz)
• Built-in overcurrent and thermal protection circuits
• Built-in soft start circuit (output ON/OFF control)
■Applications
• Power supplies for telecommunication equipment
• Onboard local power supplies
■Lineup
Part Number
VO(V)
SI-8033S
3.3
SI-8050S
5.0
SI-8090S
9.0
SI-8120S
12.0
SI-8150S
15.0
IO(A)
3.0
■Absolute Maximum Ratings
Parameter
Symbol
VIN
Ratings
43*
Unit
V
DC Input Voltage
PD1
18(With infinite heatsink)
W
Power Dissipation
PD2
1.5(Without heatsink, stand-alone operation)
W
Junction Temperature
Tj
+125
–40 to +125
–1
°C
°C
V
Storage Temperature
Tstg
SW Terminal Applied Reverse Voltage
Thermal Resistance(junction to case)
*SI-8033S: 35V
VSW
Rth(j-c)
5.5
°C/W
■Recommended Operating Conditions
Ratings
Parameter
Symbol
Unit
SI-8033S
5.5 to 28
SI-8050S
7 to 40
SI-8090S SI-8120S
SI-8150S
18 to 40
DC Input Voltage Range
VIN
IO
12 to 40
0 to 3.0
15 to 40
V
A
Output Current Range
Operating Junction Temperature Range
Tjop
–30 to +125
°C
80
●SI-8000S Series
■Electrical Characteristics
(Ta=25°C)
Ratings
Parameter
Symbol
VO
SI-8033S
SI-8050S
SI-8090S
SI-8120S
SI-8150S
Unit
V
min. typ. max. min. typ. max. min. typ. max. min. typ. max. min. typ. max.
SI-8000S *1
SI-8000SS
3.17
3.30
3.43
4.80
5.00
5.00
5.20
5.10
8.55
8.73
9.00
9.00
9.45 11.50 12.00 12.50 14.25 15.00 15.75
9.27
Output Voltage
Efficiency
3.234 3.30 3.366 4.90
Conditions
η
V
V
V
IN=15V, I
O=1.0A
O=1.0A
O=1.0A
V
V
V
IN=20V, I
O
O
O
=1.0A
V
V
V
IN=21V, I
88
O=1.0A
O=1.0A
O=1.0A
V
V
V
IN=24V, I
O
O
O
=1.0A
=1.0A
=1.0A
V
V
V
IN=25V, I
O
O
O
=1.0A
=1.0A
=1.0A
79
84
90
91
%
Conditions
f
IN=15V, I
60
IN=20V, I
60
=1.0A
=1.0A
IN=21V, I
60
IN=24V, I
60
IN=25V, I
60
Switching Frequency
Line Regulation
kHZ
mV
mV
Conditions
∆VOLINE
IN=15V, I
25
IN=20V, I
40
IN=21V, I
50
IN=24V, I
60
IN=25V, I
60
80
100
120
130
130
Conditions VIN=8 to 28V, IO=1.0A
VIN=10 to 30V, IO=1.0A VIN=15 to 30V, IO=1.0A VIN=18 to 30V, IO=1.0A VIN=21 to 30V, IO=1.0A
10 40 10 40 10 40 10 40
=0.5 to 1.5A =0.5 to 1.5A =0.5 to 1.5A =0.5 to 1.5A
±1.0
45
f=100 to 120H
3.1
∆VOLOAD
Conditions
∆VO/∆Ta
RREJ
10
30
Load Regulation
V
IN=15V, I
O
=0.5 to 1.5A
V
IN=20V, I
O
V
IN=21V, I
O
V
IN=24V, I
O
VIN=25V, IO
Temperature Coefficient of Output Voltage
±0.5
45
±0.5
45
±1.0
45
±1.0
45
mV/°C
–
Ripple Rejection
dB
Conditions
IS1
f=100 to 120H
Z
f=100 to 120H
Z
Z
f=100 to 120H
Z
f=100 to 120HZ
Overcurrent Protection
Starting Current
3.1
3.1
3.1
3.1
A
Conditions
VIN=15V
VIN=20V
VIN=21V
V
IN=24V
VIN=25V
*1: "S" may be indicated to the right of the Sanken logo.
(unit: mm)
■Outline Drawing
φ3.2±0.2
4.2±0.2
2.8±0.2
10.0±0.2
Part Number
Lot Number
Plastic Mold Package Type
Flammability: UL94V-0
Weight: Approx. 2.3g
2.6±0.1
0.95±0.15
q VIN
+0.2
–0.1
w SWOUT
e GND
r VOS
0.85
+0.2
–0.1
0.45
t S.S
P1.7±0.7×4=6.8±0.7
3.9±0.7
(4.3)
8.2±0.7
1
2 3 4 5
Forming No. 1101
81
●SI-8000S Series
■Block Diagram
VIN
1
2 SWOUT
OCP
Reg.
OSC
Reset
Drive
Comp.
TSD
VOS
4
Amp.
V
REF
S.S.
GND
3
5
■Standard External Circuit
L1
V
IN
VO
2
1
V
IN
SWOUT
C1,2 : 1000µF
SI-8000S
D1
+
+
L1 : 150µH
C1
C2
D1 : RK46(Sanken)
V
OS
4
S.S GND
3
5
GND
GND
■Ta-PD Characteristics
100
VO
PD=VO•IO
–1 –VF•IO 1–
ηχ
VIN
20
Infinite heatsink
With Silicon Grease
Heatsink: Aluminum
The efficiency depends on the input voltage and the out-
put current.Thus, obtain the value from the efficiency graph
on page 83 and substitute the percentage in the formula
above.
15
200×200×2mm
(2.3°C/W)
100×100×2mm
(5.2°C/W)
10
75×75×2mm
(7.6°C/W)
VO : Output voltage
VIN : Input voltage
IO : Output current
ηx : Efficiency (%)
VF : Diode forward voltage
0.5V(RK46)
5
0
Without heatsink
–25
0
25
50
75
100
125
Ambient Operating Temperature Ta (°C)
Thermal design for D1 must be considered separately.
82
●SI-8000S Series
■Typical Characteristics
Rise Characteristics(SI-8050S)
Efficiency Characteristics(SI-8050S)
Load Regulation(SI-8050S)
T
a=25°C
T
a
=25°C
Load=C.C Ta=25°C
*
100
90
80
70
60
5.15
10
8
5.10
5.05
5.00
6
20V
10V
7V
4
4.95
0
2
50
0
0
0
0.5
1.0
1.5
2.0
2.5
3.0
0
0.5
1.0
1.5
2.0
2.5
3.0
0
2
4
6
8
10
12
Output Current IO (A)
Input Voltage VIN (V)
Output Current IO (A)
Temperature Characteristics(SI-8050S)
Overcurrent Protection Characteristics(SI-8050S) Thermal Protection Characteristics(SI-8050S)
Ta=25°C
10
10
100
90
80
70
60
0
5.15
5.10
5.05
5.00
4.95
0
(VIN=20V,IO=1A)
(VIN=20V,IO=0A)
8
8
η
6
6
4
4
TSD OFF
TSD ON
2
2
f
20V
0
0
0
1
2
3
4
5
6
50
75
100
125
150
175
200
–50
–25
0
25
50
75
100
Output Current IO (A)
Ambient Temperature T
a
(°C)
Ambient Temperature T
a
(°C)
Note on Thermal Protection:
The thermal protection circuit is intended for pro-
tection against heat during instantaneous short-
circuiting.Its operation is not guaranteed for short-
circuiting over extended periods of time.
Rise Characteristics(SI-8120S)
Efficiency Characteristics(SI-8120S)
Load Regulation(SI-8120S)
Ta=25°C
Ta=25°C
Load=C.C Ta=25°C
*
100
90
80
70
60
12.3
25
20
15
10
5
12.2
24V
12.1
12.0
V
IN=40V
24V
15V
11.9
0
50
0
3A
0
0
0.5
1.0
1.5
2.0
2.5
3.0
0
0.5
1.0
1.5
2.0
(A)
2.5
3.0
0
5
10
15
20
25
30
Output Current I
O
(A)
Output Current I
O
Input Voltage VIN (V)
83
●SI-8000S Series
(2) Input capacitor C1
Caution
Input capacitor C1 operates as a bypass capacitor in the input
circuit.
When selecting input capacitor C1, consider the following:
a) The breakdown voltage is higher than the maximum input volt-
age.
1. Selecting External Components
(1) Choke coil L1
To maintain the stable operation of the regulator, choke coil L1
should be selected appropriately.
b) Satisfies the allowable ripple current
Exceeding the ratings of this capacitor or using it without de-
rating may reduce its service life and also cause the regulator
to malfunction. Therefore, an input capacitor with a sufficient
margin should be selected. With the SI-8000S Series, the
effective ripple current Irms flowing to the input capacitor can
be calculated approximately as follows:
VO
When selecting choke coil L1, consider the following:
a) Suitable for a switching regulator
Do not use a coil as a noise filter because it generates excess
heat.
b) Appropriate inductance
Irms 1.2 ×
× IO
The greater the inductance of the choke coil, the smaller the
output ripple voltage. However, the size of the coil increases
large as the inductance increases. If the inductance is low, a
greater peak current flows to the IC and loss increases. This
is not favorable for stable operation.
VIN
(3) Output capacitor C2
Output capacitor C2 operates as a smoothing capacitor for switch-
ing output. The output ripple voltage from the regulator is deter-
mined by the product of the pulsating current part ∆IL (=C2 charge-
discharge current) of the choke coil current and the equivalent
series resistance ESR of the output capacitor C2.
The standard external circuit shows reference inductance val-
ues suitable for stable operation. However, the appropriate
inductance may also be calculated as follows:
(VIN–VO)•VO
L=
Vrip=∆IL•C2ESR
∆IL•VIN•f
Therefore, a capacitor of low equivalent series resistance ESR
should be selected to reduce the output ripple voltage. It is rec-
ommended to select a low-impedance capacitor intended for use
with switching regulators as C2.
Where, deltaIL indicates the ripple current of the choke coil
that is roughly set as follows:
• If the working output current is close to the maximum rating
(3 A) of SI-8000S
(4) Diode D1
Ripple current = output current × 0.2 to 0.3
Use a Schottky barrier diode for D1. If you use a general rectifier
diode or fast recovery diode, the IC may be damaged. (Sanken
RK46 recommended)
• If the working output current is about 1.0A or less
Ripple current = output current × 0.3 to 0.4
c) Satisfying the rated current
The rated current of a choke coil must be greater than the
maximum load current. Note that the inductance decreases
drastically and an excess current flows if the load current ex-
ceeds the rated current of the coil.
2. Notes on Pattern Design
(1) Large current line
Since a large current flows through the bold lines in the standard
external circuit make the pattern as wide and as short as pos-
sible.
d) Good DC current superposition characteristics
The current flowing through a choke coil is a triangular wave-
form current superimposed on a DC current equal to the load
current. The coil inductance decreases as the load current
increases. In general, the coil can be used until the induc-
tance drops to 50% of the rated value. Use this as the refer-
ence value for selection.
L1
V
OUT
VIN
1
2
SI-8000S
3
4
+
+
C
1
C2
D
1
GND
GND
Inductance
100%
(2) Input capacitor
Place the input capacitor C1 and output capacitor C2 as close to
the IC as possible. Since a large current flows through the lead
wires of the input and output capacitors to charge and discharge
them quickly, minimize the lead wire length. The pattern around
the capacitors should also be minimized.
50%
IO (max.)
Load current
C1. C2.
C1. C2.
e) Less noise
+
+
A drum-type open magnetic core coil can affect peripheral
circuits with noise because the flux passes outside the coil.
To avoid this problem, use a toroidal, EI, or EE type open
magnetic core coil.
Example of bad pattern
Example of good pattern
84
●SI-8000S Series
(3) Sensing terminal
3. Variable Output Voltage
Output voltage sensing terminalVOS should be connected as close
to output capacitor C2 as possible. If the terminal is far from the
capacitor, the decreasing regulation and increasing switching
ripple may result in abnormal oscillation.
The output voltage can be increased by connecting a resistor to VOS
terminal No. 4. (There is no way of decreasing the voltage)
(1) Variable output voltage with single external resistor
L
VO'
Example of basic pattern
SI-8000S
2
SI-8000S
REX
IV
S
C2
4
V
S
L
1
5
3
D1
GND
+
C1
The output voltage adjustment resistance REX is calculated
as follows:
VOUT
C2
VO'–VS
REX=
IVS
GND
VS : Set output voltage of product
VO' : Adjusted output voltage
VIN
Top view (with part names)
IVS : Inflow current to Vs terminal
*The temperature characteristics of output voltage worsen because
the value REX is not compensated for temperature. The Vs value
fluctuates by up to ±20% depending on the IC product. Since the
output voltage fluctuates more, a semi-fixed resistor is necessary
for accurate output voltage adjustment. If Vs and REX are constant,
the range of output voltage fluctuation can be expressed as follows:
Applications
1. Soft Start
Connecting a capacitor to terminal no.5 permits a soft start at power-
on. Delay time Td and rise time Ts can roughly be calculated as
shown below. (However, the values may slightly vary in an actual
application.) If the capacitance of C3 is increased, it takes longer to
discharge C3 after VIN is turned off. Therefore, it is recommended to
set the value within 10µF. When not using the soft start function,
keep terminal no. 5 open.
VO'–VS
∆VO'(%)=±20•
VO'
∆VO':Adjusted output voltage
(2) Variable output voltage with two external resistors
0.7×C3
20×10–6
L
Td=
Ts=
(sec)
V
O
2
4.845×C3
VIN×20×10–6
(sec)
IREX1
SI-8000S
REX1
C2
V
S
4
3
IV
S
SI-8000S
V
V
IN
REX2
5
GND
S.S.
C3
O
The output voltage adjustment resistances REX1 and REX2 are
calculated as follows:
T
d
TS
VO'–VS
REX1=
2. Output ON/OFF control
S•IVS
Output can be turned on and off by using the soft start terminals.
Set the soft start terminal voltage to VSSL (0.2V typ.) or less to stop
output. To switch the potential at the soft start terminals, drive the
open collector of the transistor. Since the discharge current from C3
flows to the ON/OFF control transistor, limit the current for protec-
tion. The SS terminal is pulled up to the power supply in the IC and
no external voltage can be applied.
VS
REX2=
(S-1)•IVS
S:Stability factor
Bypassing the current to REX2 improves the temperature charac-
teristics and voltage fluctuation ranges more than the method of
(1). Stability factor S indicates the ratio of REX1 to Vs terminal
inflow current. Increasing the S value improves the fluctuations
of the temperature characteristics and output voltage. (Usually 5
to 10)
SI-8000S
5
SI-8000S
5
S.S.
S.S.
If the Vs and REX values are constant, the output voltage fluctua-
tion range can be calculated as follows:
C3
±20 VO'–VS
∆VO'(%)=
•
S
VO'
ON/OFF
S.S + ON/OFF
85
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