SI-8050SD [SANKEN]

Surface Mount Separate Excitation Step-down Switching Mode Regulator ICs; 表面贴装励降压开关模式稳压器集成电路
SI-8050SD
型号: SI-8050SD
厂家: SANKEN ELECTRIC    SANKEN ELECTRIC
描述:

Surface Mount Separate Excitation Step-down Switching Mode Regulator ICs
表面贴装励降压开关模式稳压器集成电路

稳压器 开关式稳压器或控制器 电源电路 开关式控制器
文件: 总5页 (文件大小:451K)
中文:  中文翻译
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1-1-2 Switching Mode Regulator ICs  
SI-8000SD Series Surface Mount, Separate Excitation Step-down Switching Mode Regulator ICs  
Features  
Lineup  
• Surface-mount package (TO263-5)  
Part Number  
SI-8033SD  
3.3  
SI-8050SD  
5.0  
VO (V)  
• Output current: 3.0A  
IO (A)  
3
• High efficiency: 79% typ. (SI-8033SD), 84%  
typ. (SI-8050SD)  
Absolute Maximum Ratings  
• Requires only 4 discrete external components  
Parameter  
Symbol  
Ratings  
43*1  
Unit  
V
Conditions  
• Internally-adjusted phase correction and  
output voltage  
DC Input Voltage  
VIN  
When mounted on glass-epoxy board 40 × 40 mm  
Power Dissipation*2  
PD  
3
W
• Built-in reference oscillator (60kHz)  
(copper area: 100%)  
Junction Temperature  
Tj  
+125  
–40 to +125  
3
°C  
°C  
• Built-in overcurrent and thermal protection  
circuits  
Storage Temperature  
Tstg  
θj-c  
Thermal Resistance (Junction to Case)  
°C/W  
• Output ON/OFF available  
Thermal Resistance  
(Junction to Ambient Air)  
When mounted on glass-epoxy board 40 × 40 mm  
(copper area: 100%)  
θj-a  
33.3  
°C/W  
• Soft start available by S.S pin  
*1: 35V for SI-8033SD  
*2: Limited by thermal protection circuit.  
Applications  
• Power supplies for telecommunication equipment  
• Onboard local power supplies  
Recommended Operating Conditions  
Ratings  
Parameter  
Symbol  
Unit  
SI-8033SD  
5.5 to 28  
SI-8050SD  
7 to 40  
DC Input Voltage Range  
VIN1  
IO  
V
A
Output Current Range*  
0 to 3.0  
Operating Junction Temperature Range  
Operating Temperature Range*  
Tjop  
Top  
–30 to +125  
–30 to +125  
°C  
°C  
*: Limited by Ta-PD characteristics.  
Electrical Characteristics  
(Ta=25°C)  
Ratings  
Parameter  
Symbol  
SI-8033SD  
SI-8050SD  
Unit  
min.  
3.17  
typ.  
max.  
3.43  
min.  
typ.  
max.  
5.2  
VO  
3.3  
4.8  
5.0  
Output Voltage  
V
Conditions  
η
VIN=15V, IO=1A  
VIN=20V, IO=1A  
79  
VIN=15V, IO=1A  
60  
84  
Efficiency  
%
Conditions  
f
VIN=20V, IO=1A  
60  
Oscillation Frequency  
Line Regulation  
kHZ  
mV  
Conditions  
VOLINE  
Conditions  
VOLOAD  
Conditions  
VO/Ta  
IS1  
VIN=15V, IO=1A  
25  
VIN=20V, IO=1A  
80  
30  
40  
VIN=10 to 30V, IO=1A  
10  
100  
40  
VIN=8 to 28V, IO=1A  
10  
VIN=15V, IO=0.5 to 1.5A  
0.5  
Load Regulation  
mV  
VIN=20V, IO=0.5 to 1.5A  
0.5  
Temperature Coefficient of Output Voltage  
mV/°C  
Overcurrent Protection  
Starting Current  
3.1  
20  
3.1  
20  
A
V
Conditions  
VSSL  
VIN=15V  
0.2  
VIN=20V  
0.2  
Low-Level Voltage  
Soft  
Start Pin*  
Outflow Current at  
Low Voltage  
ISSL  
30  
40  
30  
40  
µA  
Conditions  
VSSL=0.2V  
* Pin 5 is a soft start pin. Soft start at power on can be performed with a capacitor connected to  
this pin.  
SI-8000SD  
SI-8000SD  
SI-8000SD  
The output can also be turned ON/OFF with this pin.  
The output is stopped by setting the voltage of this pin to VSSL or lower.  
Soft-start pin voltage can be changed with an open-collector drive circuit of a transistor.  
When using both the soft-start and ON/OFF functions together, the discharge current from C3  
flows into the ON/OFF control transistor. Therefore, limit the current securely to protect the  
transistor if C3 capacitance is large.  
5
ON/OFF  
5
ON/OFF  
C3  
5
ON/OFF  
C3  
The ON/OFF pin is pulled up to the power supply in the IC, so applying the external voltage is  
prohibited.  
If this pin is not used, leave it open.  
VOUT. ON/OFF  
Soft start  
Soft start  
+VOUT. ON/OFF  
ICs  
50  
SI-8000SD Series  
External Dimensions (TO263-5)  
(Unit : mm)  
Case temperature  
measurement point  
0.2  
10.0  
(8.0)  
Pin Assignment  
0.2  
9.90  
(4.4)  
q
w
e
r
t
VIN  
(15°)  
0.2  
4.5  
+0.10  
–0.05  
1.3  
SWOUT  
GND  
VOS  
3-R0.3  
0.2  
(2×R0.45)  
(3°)  
φ1.5 Dp:  
S.S  
0.15  
0.10  
(3°)  
(3°)  
Plastic Mold Package Type  
Flammability: 94V-0  
0.2  
2.4  
(R0.3)  
Product Mass: Approx. 1.48g  
0.10  
0.25  
0.88  
(1.7  
(R0.3)  
0~6°  
(0.5)  
0.1  
0.1  
0.8  
0.8  
0.25  
0.25  
0.25  
)
(1.7  
)
(1.7  
)
(1.7  
)
1
2
3
4
5
(3°)  
(3°)  
2-R0.3  
0.02  
10.0  
Block Diagram  
Reference Data  
Copper Laminate Area on Glass Epoxy Board vs.  
thermal resistance (junction to ambient air) (Typical Value)  
1
VIN  
SWOUT  
2
Internal power  
supply  
Overcurrent  
protection  
55  
50  
Oscillator  
Reset  
With glass epoxy board of 40 × 40 mm  
Latch & driver  
45  
Thermal  
protection  
Comparator  
40  
θ
V
OS  
4
35  
30  
Error  
amplifier  
0
200  
400  
600  
800  
1000 1200 1400 1600 1800  
Reference voltage  
Copper Laminate Area (mm2)  
S.S  
GND  
5
3
Typical Connection Diagram  
L1  
1
2
4
C1 : 50V/1000µF  
C2 : 50V/1000µF  
C3 : 0.01µF  
V
OUT  
SWOUT  
OS  
V
IN  
VIN  
V
SI-8000SD  
(only when soft start function is used)  
L1 : 150µH  
D1 : SPB-G56 (Sanken)  
+
+
S.S  
GND  
3
C1  
C2  
D1  
5
C3  
GND  
GND  
Diode D1  
• Be sure to use Schottky-barrier diode as D1.  
If other diodes like fast recovery diodes are used, ICs may be destroyed because of the reverse voltage generated by the recovery voltage or ON  
voltage.  
Choke coil L1  
• If the winding resistance of the choke coil is too high, the efficiency may drop below the rated value.  
• As the overcurrent protection starting current is about 3.5 A, take care concerning heat radiation from the choke coil caused by magnetic saturation  
due to overload or short-circuited load.  
Capacitors C1, C2, and C3  
• As large ripple currents flow through C1 and C2, use high-frequency and low-impedance capacitors aiming for switching-mode-power-supply use.  
Especially when the impedance of C2 is high, the switching waveform may become abnormal at low temperatures.  
For C2, do not use a capacitor with an extremely low equivalent series resistance (ESR) such as an OS capacitor or a tantalum capacitor, which may  
cause an abnormal oscillation.  
• C3 is a capacitor for soft start. Leave pin 5 open if the soft start function is not used.  
This pin is pulled up with a pull-up resistor inside the ICs.  
To create the optimum operating conditions, place the components as close as possible to each other.  
ICs  
51  
SI-8000SD Series  
SI-8033SD  
Power dissipation vs. Output current (typical value)  
Output current vs. Input voltage (typical value)  
4.0  
3.5  
3.0  
2.5  
2.0  
1.5  
1.0  
0.5  
0
3.5  
V
IN 5.5V  
8V  
3
With glass epoxy board  
measuring 40 × 40 mm  
2.5  
2
15V  
20V  
28V  
1.5  
1
Operable range  
0.5  
0
0
0.5  
1
1.5  
2
2.5  
3
3.5  
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20  
Output current I  
O
(A)  
Input voltage VIN [V]  
SI-8050SD  
Power dissipation vs. Output current (typical value)  
Output current vs. Input voltage (typical value)  
4.0  
3.5  
3.0  
2.5  
2.0  
1.5  
1.0  
0.5  
0
3.5  
VIN 7V  
10V  
3
With glass epoxy board  
measuring 40 × 40 mm  
2.5  
2
20V  
30V, 40V  
1.5  
1
Operable range  
0.5  
0
0
0.5  
1
1.5  
2
2.5  
3
3.5  
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20  
Output current I  
O
(A)  
Input voltage VIN [V]  
PD-Ta Characteristics  
3.5  
100  
VO  
Copper laminate aera:  
40×40 mm  
PD=VO IO  
1 VF IO 1–  
θ
(
j-a : 33.3°C/W)  
ηχ  
VIN  
3
2.5  
2
20×40 mm  
θ
(
j-a : 37°C/W)  
20×20 mm  
Find the efficiency from the efficiency curve and substi-  
tute in the percentage, because the efficiency varies de-  
pending on the input voltage and output current.  
θ
(
j-a : 44°C/W)  
10×10 mm  
θ
(
j-a : 53°C/W)  
1.5  
1
VO : Output voltage  
VIN: Input voltage  
0.5  
0
IO : Output current  
ηχ : Efficiency  
25  
0
25  
50  
75  
100  
125  
VF : Forward voltage of D1  
0.4V (IO=2A) ··· SPB-G56S (Sanken)  
Ambient temperature Ta (°C)  
When mounted on glass epoxy board  
Thermal design for D1 must be performed separately.  
measuring 40 × 40 mm  
Applications  
Varying output voltage  
The output voltage can be varied in the same manner as SI-8000S. Refer of the catalog.  
SI-8000SD Series  
Typical Characteristics Examples (SI-8033SD)  
Efficiency  
Output voltage rise  
Load regulation  
Ta=25°C  
*Load=C.C  
Ta=25°C  
Ta=25°C  
100  
90  
80  
70  
60  
50  
40  
30  
5
4
3
2
1
0
3.40  
3.35  
3.30  
3.25  
3.20  
3.15  
V
IN=28V  
IO=0A  
V
IN=28V  
15V  
8V  
15V  
8V  
6V  
6V  
1A  
3A  
0
0.5  
1.0  
1.5  
2.0  
(A)  
2.5  
3.0  
0
2
4
6
8
10  
12  
0
0.5  
1.0  
1.5  
2.0  
2.5  
3.0  
Output current I  
O
Input voltage VIN (V)  
Output current IO (A)  
Overcurrent protection characteristics  
Thermal protection  
Temperature characteristics  
T
a
=25°C  
VIN=15V, IO=1A  
V
IN=15V, IO=0A  
5
90  
80  
70  
60  
50  
40  
3.40  
5
4
3
2
1
0
4
3
2
1
0
3.35  
3.30  
3.25  
3.20  
3.15  
η
V
IN=6V 15V 28V  
V
O
Freq  
TSD OFF  
TSD ON  
0
1
2
3
4
5
6
50  
25  
0
25  
50  
75  
(°C)  
100  
50  
75  
100  
125  
150  
175  
(°C)  
200  
Output current I  
O
(A)  
Ambient temperature Ta  
Ambient temperature T  
a
SI-8000SD Series  
Typical Characteristics Example (SI-8050SD)  
Efficiency  
Output voltage rise  
Load regulation  
T
a
=25°C  
*Load=C.C Ta=25°C  
Ta=25°C  
100  
90  
80  
70  
60  
50  
40  
30  
10  
8
5.15  
5.10  
5.05  
5.00  
4.95  
4.90  
V
IN=40V  
20V  
10V  
7V  
6
V
IN=40V  
20V  
I
O
=0A  
10V  
7V  
4
1A  
3A  
2
0
0
0.5  
1.0  
1.5  
2.0  
(A)  
2.5  
3.0  
0
2
4
6
8
10  
12  
0
0.5  
1.0  
1.5  
2.0  
2.5  
3.0  
Output current I  
O
Input voltage VIN (V)  
Output current IO (A)  
Overcurrent protection characteristics  
Thermal protection  
Temperature characteristics  
V
IN=20V, IO=1A  
T
a
=25°C  
VIN=20V, IO=0A  
100  
90  
80  
70  
60  
50  
5.15  
5.10  
5.05  
5.00  
4.95  
4.90  
10  
8
10  
8
η
6
6
VO  
V
IN=7V 20V 40V  
4
4
TSD OFF  
TSD ON  
2
2
Freq  
0
0
50  
50  
25  
0
25  
50  
75  
100  
0
1
2
3
4
5
6
75  
100  
125  
150  
175  
(°C)  
200  
Ambient temperature T  
a
(°C)  
Output current I  
O
(A)  
Ambient temperature Ta  

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