1-1-2 Switching Mode Regulator ICs
SI-8000SD Series
■Features
• Surface-mount package (TO263-5) • Output current: 3.0A
Surface Mount, Separate Excitation Step-down Switching Mode Regulator ICs
■Lineup
Part Number VO (V) IO (A) SI-8033SD 3.3 3 SI-8050SD 5.0
• High efficiency: 79% typ. (SI-8033SD), 84% typ. (SI-8050SD) • Requires only 4 discrete external components • Internally-adjusted phase correction and output voltage • Built-in reference oscillator (60kHz) • Built-in overcurrent and thermal protection circuits • Output ON/OFF available • Soft start available by S.S pin
■Absolute Maximum Ratings
Parameter DC Input Voltage Power Dissipation*2 Junction Temperature Storage Temperature Thermal Resistance (Junction to Case) Thermal Resistance (Junction to Ambient Air) Symbol VIN PD Tj Tstg Ratings 43*1 3 +125 –40 to +125 3 33.3 Unit V W °C °C °C/W °C/W When mounted on glass-epoxy board 40 × 40 mm (copper area: 100%) When mounted on glass-epoxy board 40 × 40 mm (copper area: 100%) Conditions
θ j-c θ j-a
■Applications
• Power supplies for telecommunication equipment • Onboard local power supplies
*1: 35V for SI-8033SD *2: Limited by thermal protection circuit.
■Recommended Operating Conditions
Ratings Parameter DC Input Voltage Range Output Current Range* Operating Junction Temperature Range Operating Temperature Range* Symbol VIN1 IO Tjop Top SI-8033SD 5.5 to 28 0 to 3.0 –30 to +125 –30 to +125 SI-8050SD 7 to 40 Unit V A °C °C
*: Limited by Ta-PD characteristics.
■Electrical Characteristics
Ratings Parameter Symbol min. Output Voltage Efficiency Oscillation Frequency Line Regulation Load Regulation Temperature Coefficient of Output Voltage Overcurrent Protection Starting Current Soft Start Pin* Low-Level Voltage Outflow Current at Low Voltage VO Conditions 3.17 SI-8033SD typ. 3.3 VIN=15V, IO=1A 79 VIN=15V, IO=1A 60 VIN=15V, IO=1A 25 VIN=8 to 28V, IO=1A 10 VIN=15V, IO=0.5 to 1.5A ± 0.5 3.1 VIN=15V 0.2 20 30 40 VSSL=0.2V 20 3.1 VIN=20V 0.2 30 40 30 80 max. 3.43 min. 4.8 SI-8050SD typ. 5.0 VIN=20V, IO=1A 84 VIN=20V, IO=1A 60 VIN=20V, IO=1A 40 VIN=10 to 30V, IO=1A 10 VIN=20V, IO=0.5 to 1.5A ± 0.5 40 100 max. 5.2
(Ta=25°C) Unit
V % kHZ mV mV mV/ °C A V
η
Conditions f Conditions ∆VOLINE Conditions ∆VOLOAD Conditions ∆VO/∆Ta IS1 Conditions VSSL ISSL Conditions
µA
* Pin 5 is a soft start pin. Soft start at power on can be performed with a capacitor connected to this pin. 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. 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.
SI-8000SD
SI-8000SD
SI-8000SD
5 ON/OFF
5 ON/OFF C3
5 ON/OFF C3
VOUT. ON/OFF
Soft start
Soft start +VOUT. ON/OFF
50
ICs
SI-8000SD Series
■External Dimensions (TO263-5)
Case temperature measurement point
(0.40) 1.2
(Unit : mm)
10.0 (8.0) 4.5 3-R0.3
±0.2 ±0.2
9.90 (15°)
±0.2
±0.2
(4.4) 1.3 +0.10 –0.05
(1.75)
(6.8)
±0.2
9.2±
±0.3
15.3
(3°)
±0.1
0.10 (3°)
±0.15
15.30
±0.3
9.2
±0.2
φ1.5 Dp:
±0.2
(3°)
(2×R0.45)
Pin Assignment q VIN w SWOUT e GND r VOS t S.S Plastic Mold Package Type Flammability: 94V-0 Product Mass: Approx. 1.48g
(4.6)
2.4 (R0.3)
±0.3
±0.2
±0.2
2.0
(0.75)
4.9
0.88
±0.10
(R0.3)
2.54
0~6°
±0.1
(0.5) (1.7
±0.25
) 1 2 3 4 5
0.8 ±0.25 (1.7 )
±0.1
(1.7
±0.25
)
0.8 ±0.25 (1.7 )
(3°) 2-R0.3 10.0
±0.02
(3°)
■Block Diagram
■Reference Data
Copper Laminate Area on Glass Epoxy Board vs. thermal resistance (junction to ambient air) (Typical Value)
1
VIN
Internal power supply
SWOUT
Overcurrent protection
2
Thermal resistance (junction to ambient air) θ j-a (°C/W)
55 50 With glass epoxy board of 40 × 40 mm 45 40 35 30 0
Oscillator
Reset
Latch & driver
Comparator
Thermal protection
VOS
Error amplifier
4
4.9
±0.2
Reference voltage
200
400
600
800
1000
1200
1400
1600
1800
Copper Laminate Area (mm2)
S.S 5 3
GND
■Typical Connection Diagram
L1 VIN 1 VIN SWOUT 2 4 + D1 VOUT
SI-8000SD
C1 + S.S 5 C3 GND GND 3
VOS
C2
C1 : 50V/1000µF C2 : 50V/1000µF C3 : 0.01µF (only when soft start function is used) L1 : 150µH D1 : SPB-G56 (Sanken)
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
qSI-8000SD Series
sSI-8033SD
Power dissipation vs. Output current (typical value)
3.5 3
Power dissipation Pd (W)
Output current vs. Input voltage (typical value)
4.0
VIN 5.5V
8V
Output current IO (A)
3.5 3.0 2.5 2.0 1.5 1.0 0.5
With glass epoxy board measuring 40 × 40 mm
2.5 2 1.5 1 0.5 0 15V 20V 28V
Operable range
0
0.5
1
1.5
2
2.5
3
3.5
0
0
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20
Output current IO (A)
Input voltage VIN [V]
sSI-8050SD
Power dissipation vs. Output current (typical value)
3.5 3
Power dissipation Pd (W)
Output current vs. Input voltage (typical value)
4.0
VIN 7V
10V
Output current IO (A)
3.5 3.0 2.5 2.0 1.5 1.0 0.5
With glass epoxy board measuring 40 × 40 mm
2.5 20V 2 1.5 1 0.5 0 30V, 40V
Operable range
0
0.5
1
1.5
2
2.5
3
3.5
0
0
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20
Output current IO (A)
Input voltage VIN [V]
sPD-Ta Characteristics
3.5 3
Power dissipation PD (W)
Copper laminate aera: 40×40 mm (θ j-a : 33.3°C/W) 20×40 mm (θ j-a : 37°C/W) 20×20 mm (θ j-a : 44°C/W) 10×10 mm (θ j-a : 53°C/W)
PD=VO • IO
100 VO –1 – VF • IO 1– ηχ VIN
2.5 2 1.5 1 0.5
Find the efficiency from the efficiency curve and substitute in the percentage, because the efficiency varies depending on the input voltage and output current. VO : VIN : IO : ηχ : VF : Output voltage Input voltage Output current Efficiency Forward voltage of D1 0.4V (IO=2A) ··· SPB-G56S (Sanken)
0 –25
0
Ambient temperature Ta (°C)
25
50
75
100
125
When mounted on glass epoxy board measuring 40 × 40 mm
Thermal design for D1 must be performed separately.
Applications
Varying output voltage The output voltage can be varied in the same manner as SI-8000S. Refer of the catalog.
qSI-8000SD Series
sTypical Characteristics Examples (SI-8033SD)
Efficiency
100 90 4
3.35
Output voltage rise
Ta=25°C 5 *Load=C.C Ta=25°C
3.40
Load regulation
Ta=25°C
Output voltage VO (V)
80
Efficiency η (%)
VIN=28V 6V 15V 8V
70 60 50 40 30
3
IO=0A 1A 3A
Output voltage VO (V)
3.30
VIN=28V 15V 8V 6V
2
3.25
1
3.20
0
0.5
1.0
1.5
2.0
2.5
3.0
0 0 2 4 6 8 10 12
3.15 0 0.5 1.0 1.5 2.0 2.5 3.0
Output current IO (A)
Input voltage VIN (V)
Output current IO (A)
Overcurrent protection characteristics
5 Ta=25°C 5
Thermal protection
VIN=15V, IO=0A 90
Temperature characteristics
VIN=15V, IO=1A 3.40
Efficiency η (%) Frequency Freq (kHz)
4
4 VIN=6V 15V 28V
80
η
VO
3.35
Output voltage VO (V)
3
Output voltage VO (V)
3
70
3.30
2
2 TSD OFF 1 TSD ON
60
Freq
3.25
1
50
3.20
0 0 1 2 3 4 5 6
0 50
75
100
125
150
175
200
40 –50
–25
0
25
50
75
3.15 100
Output current IO (A)
Ambient temperature Ta (°C)
Ambient temperature Ta (°C)
Output voltage VO (V)
qSI-8000SD Series
sTypical Characteristics Example (SI-8050SD)
Efficiency
100 90 VIN=40V 8
5.10
Output voltage rise
Ta=25°C 10 *Load=C.C Ta=25°C
5.15
Load regulation
Ta=25°C
Output voltage VO (V)
80
20V
Efficiency η (%)
7V 70 60 50 40 30
10V
6 IO=0A 4
1A
Output voltage VO (V)
5.05
VIN=40V
20V
5.00
10V 7V
3A 2
4.95
0 0 0.5 1.0 1.5 2.0 2.5 3.0 0 2 4 6 8 10 12
4.90 0 0.5 1.0 1.5 2.0 2.5 3.0
Output current IO (A)
Input voltage VIN (V)
Output current IO (A)
Overcurrent protection characteristics
10 Ta=25°C 10
Thermal protection
VIN=20V, IO=0A
Temperature characteristics
100 VIN=20V, IO=1A 5.15
Efficiency η (%) Frequency Freq (kHz)
8
8
90
5.10
Output voltage VO (V)
Output voltage VO (V)
η
80 VO 5.05
6 VIN=7V 20V 40V 4
6
4 TSD OFF 2 TSD ON
70
5.00
2
60 Freq 50 –50
4.95
0 0 1 2 3 4 5 6
0 50
75
100
125
150
175
200
–25
0
25
50
75
4.90 100
Output current IO (A)
Ambient temperature Ta (°C)
Ambient temperature Ta (°C)
Output voltage VO (V)
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