SANKEN SI

1-1-2 Switching Mode Regulator ICs
SI-8000GL Series
Compact, Separate Excitation Step-down Switching Mode Regulator ICs
■Features
■Absolute Maximum Ratings
• DIP 8 pin package
• Output current: 1.5A
• High efficiency: 86% (at VIN = 20V, lO = 1A, VO
= 5V)
• Capable of downsize a choke-coil due to IC's
high switching frequency (250kHz). (Compared with conventional Sanken devices)
• The output-voltage-variable type can vary its
output voltage from 1V to 14V because of its
low reference voltage (Vref) of 1V.
• Wide Input Voltage Range (8 to 50V)
• Output ON/OFF available
• Built-in overcurrent protection and thermal
protection circuits
Symbol
Ratings
DC Input Voltage
Parameter
VIN
53
Unit
V
Power Dissipation
PD*1
1
W
°C
Junction Temperature
Tj
+125
Storage Temperature
Tstg
–40 to +125
°C
Thermal Resistance (junction to case)
θ j-c
28
°C/W
Thermal Resistance (junction to ambient air)
θ j-a
100
°C/W
*1: Limited by thermal protection.
■Applications
• Onboard local power supplies
• OA equipment
• For stabilization of the secondary-side output voltage of switching power supplies
■Recommended Operating Conditions
Ratings
Symbol
Parameter
SI-8010GL
(8 or VO+3)*1 to 50
DC Input Voltage Range
VIN
Output Voltage Range
VO
1 to 14
Output Current Range
IO
0.02 to 1.5
Operating Junction Temperature Range
Tjop
–30 to +125
Operating Temperature Range
Top
–30 to +125
*1: The minimum value of an input voltage range is the higher of either 8V or VO+3V.
■Electrical Characteristics
(Ta=25°C)
Ratings
Parameter
Symbol
SI-8010GL (Variable type)
min.
Reference Voltage
0.97
FOSC
Conditions
Temperature Coefficient
of Reference Voltage
Overcurrent Protection
Starting Current
Quiescent Circuit Current
Circuit Current at Output OFF
40
VIN=10 to 30V, IO=1A
∆VOLOAD
10
Conditions
30
VIN=12V, IO=0.1 to 1.5A
1.6
Conditions
Iq
Conditions
7
400
VIN=12V, VON/OFF=0.3V
VSSL
0.5
Terminal Outflow
Current at Low Voltage
ISSL
50
*: Pin 2 is the CE/SS 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. CE/SS-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 C4 flows into the ON/OFF control transistor. Therefore, limit the current securely to
protect the transistor if C3 capacitance is large. The CE/SS pin is pulled up to the power
supply in the IC, so applying the external voltage is prohibited.
VSSL=0V
ICs
µA
V
µA
SI-8000GL
SI-8000GL
SI-8000GL
2 CE/SS
2 CE/SS
2 CE/SS
C4
VO. ON/OFF
68
mA
VIN=12V, IO=0A
Low Level Voltage
Conditions
mV
A
VIN=12V
Iq(OFF)
Conditions
mV
mV/°C
±0.5
∆VREF/∆Ta
IS
kHZ
VIN=12V, IO=1A
20
V
%
250
Conditions
Load Regulation
1.03
VIN=20V, IO=1A, VO=5V
∆VOLINE
Line Regulation
1.00
86
Conditions
Oscillation Frequency
max.
VIN=12V, IO=1A
Eff
Efficiency
CE/SS*
Terminal
VREF
Conditions
Unit
typ.
Soft start
C4
Soft start
+VO. ON/OFF
SI-8000GL Series
■External Dimensions (DIP8)
7
6
a
6.5±0.2
8
(Unit: mm)
5
8010GL
SK
b
Pin Assignment
1. GND
2. CE/SS
3. Reg
4. SWOUT
5. VIN
6. B.S
7. Comp
8. VREF
c
1
2
3
4
1.0+0.3
-0.05
1.5+0.3
-0.05
7.6
7.5±0.5
4.2±0.3
3.4±0.1
9.4±0.3
+0.1
0.25-0.
05
3.3±0.2
Plastic Mold Package Type
Flammability: UL 94V-0
Product Mass: Approx. 0.49 g
0.5±0.1
0.25 M
2.54
0°∼15°
0.89 TYP
■Block Diagram
■Ta-PD Characteristics
SI-8010GL
2
PD=VO • IO
1.8
UVLO
CE/SS
P.REG
Power Dissipation PD (W)
VIN
OCP
CE/SS
BS
Boot REG
TSD
DRIVE
Reg
OSC
+
PWM
LOGIC
-
SWOUT
100
VO
–1 –VF • IO 1–
ηχ
VIN
1.6
Note 1: The efficiency depends on the input voltage and the output current. Therefore, obtain the value from the efficiency graph and
substitute the percentage in the formula
above.
Note 2: Thermal design for D1 must be considered
separately.
1.4
1.2
1
θ j-a:100°C/W
0.8
0.6
0.4
0.2
0
–25
VREF
Comp
Amp
+
0
25
50
75
100
125
Ambient Temperature Ta (°C)
1V
GND
VO : Output voltage
VIN : Input voltage
IO : Output current
ηχ : Efficiency
VF : Diode D1 forward voltage
RK16···0.4V(IO=1A)
■Typical Connection Diagram
SI-8010GL
C1: 220µF/63V
C2: 470µF/25V
C3: 0.1µF
C4: 1000pF
C5: 0.1µF
C6: 0.047µF
C7: 0.1µF
6
B.S
R1
L1
C3
5
VIN
VIN
SI-8010GL
SWOUT
V0
4
2
C1
+
Reg
3
C4
GND
D1 R2
CE/SS
C7
Comp
7
C5
GND
1
VREF
+
C2
8
R3
C8
IREF
C8: 0.1µF
R1: 47Ω
L1: 47µH
D1: RK16
(Sanken)
C6
GND
R2=
(VOUT–VREF) (VOUT–1)
1
VREF
.=
=
=
(Ω), R3 =
. 500(Ω)
IREF
2×10–3
IREF
2×10–3
Diode D1
• Be sure to use a Schottky-barrier diode as D1. If other diodes like fast recovery diodes are used, IC 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 approx. 2.5 A, take care concerning heat radiation from the choke coil caused by magnetic saturation due to
overload or short-circuited load.
Capacitor C1, C2
• 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.
Resistors R2, R3
• R2 and R3 are the resistors to set the output voltage. Set their values so that IREF becomes approx. 2 mA. Obtain R2 and R3 values by the following formula above.
* To create the optimum operating conditions, place the components as close as possible to each other.
ICs
69
●SI-8000GL Series
■Example of Pattern on PC Board
SI-8010GL
C9
C6
VIN
R2
R3
+
C1
C7
C2
R1
+
GND
C3
C4
D1
L1
V0
C8
C5
Recommended Pattern
*For the optimum conditions, use one-point GND wiring centering on pin 1, and place each component as closely as possible.
■Ta-PD Characteristics
PD=VO • IO
Power Dissipation PD (W)
1.8
100
VO
–1 –VF • IO 1–
ηχ
VIN
1.6
Note 1: The efficiency depends on the input voltage and the output current. Thus, obtain the value from the efficiency
graph and substitute the percentage in the formula above.
Note 2: Thermal design for D1 must be considered separately.
1.4
1.2
θ j-a:100°C/W
1
0.8
0.6
0.4
0.2
0
–25
0
25
50
75
100
125
Ambient Temperature Ta (°C)
VO : Output voltage
VIN : Input voltage
IO : Output current
ηχ : Efficiency
VF : Diode forward voltage
RK16···0.4V(IO=1A)
■Packaging specifications
(Unit: mm)
Minimum package
Stick
Qty: 50 pcs/1 stick
Stopper (with fin)
11.6±0.2
5.7±0.2
5.0±1.0
4.2±0.15
13±0.2
505±1.0
Stopper (without fin)
50pcs
5
●SI-8000GL Series
■Typical characteristics (SI-8010GL)
Efficiency Characteristics
Output Voltage
Ta=25°C
100
VO=24V
Ta=25°C
1.03
1.0
Output Voltage VO (V)
80
IO=1.5A
1A
VO=1.8V
0.5A
IO=1.5A
60
1.02
Output Voltage VO (V)
1A
0.5A
VO=5V
Efficiency η (%)
1.2
IO=1.5A
90
70
Load Regulation
*Load=C.R Ta=25°C
0.8
IO=0.02A 1A 1.5A
0.6
0.4
0.2
1.01
VIN=8V
12V
1.00
20V
30V
0.99
0.98
1A
10
20
30
40
0
50
0
Overcurrent Protection Characteristics
10
15
20
VIN=30V 20V 12V 8V
1.0
Output Voltage VO (V)
Output Voltage VO (V)
0.8
0.6
0.4
1
2
3
Output Current IO (A)
6
0.8
0.6
TSD OFF
TSD ON
0.4
0.2
0.2
0
0
4
0
50
100
150
Ambient Temperature Ta (°C)
0.5
1.0
1.5
Temperature Characteristics
VIN=12V, IO=0.02A
1.2
1.0
0
0.97
Output Current IO (A)
Thermal Protection Characteristics
Ta=25°C
1.2
5
Input Voltage VIN (V)
Input Voltage VIN (V)
200
VIN=12V, IO=1A
300
Freq
250
200
1.015
1.01
1.005
150
1
VO
100
50
–50
0.995
η
0
50
100
Ambient Temperature Ta (°C)
0.99
150
Output Voltage VO (V)
0.5A
0
Frequency Freq (kHz) Efficiency η (%)
50