SI-8000GL Series
sExternal
Dimensions (DIP8)
6.5±0.2
(Unit: mm)
8
a
7
6
8010GL
b
c
5
SK
1
2
3
4
9.4±0.3
3.4±0.1
4.2±0.3
1.0
+0.3
-0.05
1.5
+0.3
-0.05
7.5±0.5
7.6
+0.1
0.25
-0.05
0.5±0.1
2.54
0.89 TYP
3.3±0.2
Pin Assignment
1. GND
2. CE/SS
3. Reg
4. SW
OUT
5. V
IN
6. B.S
7. C
omp
8. V
REF
0.25
M
0°∼15°
sBlock
Diagram
SI-8010GL
sT
a
-P
D
Characteristics
2
1.8
P
D
=V
O
• I
O
100
V
O
–1 –V
F
• I
O
1–
ηχ
V
IN
Power Dissipation P
D
(W)
V
IN
1.6
1.4
1.2
θ
j-a:100°C/W
UVLO
CE/SS
CE/SS
P.REG
OCP
BS
Boot REG
TSD
1
0.8
0.6
0.4
0.2
DRIVE
Reg
OSC
+
-
PWM
LOGIC
SW
OUT
Note 1: The efficiency depends on the input volt-
age and the output current. Therefore, ob-
tain the value from the efficiency graph and
substitute the percentage in the formula
above.
Note 2: Thermal design for D
1
must be considered
separately.
25
50
75
100
125
V
REF
Comp
-
Amp
+
0
–25
0
Ambient Temperature T
a
(°C)
1V
GND
V
O
: Output voltage
V
IN
: Input voltage
I
O
: Output current
ηχ
: Efficiency
V
F
: Diode D
1
forward voltage
RK16···0.4V(I
O
=1A)
sTypical
Connection Diagram
SI-8010GL
6
B.S
5
R1
L1
C3
V
IN
2
C1
V
IN
CE/SS
C7
SI-8010GL
Comp
7
C5
C6
SW
OUT
4
D1 R2
C9
V
0
+
Reg
3
C4
GND
1
V
REF
+
C2
C8
8
R3
I
REF
C1: 220
µ
F/63V
C2: 470
µ
F/25V
C3: 0.1
µ
F
C4: 1000pF
C5: 0.1
µ
F
C6: 0.047
µ
F
C7: 0.1
µ
F
R2=
C8: 0.1
µ
F
C9: 6800pF
R1: 47Ω
L1: 47
µ
H
D1: RK16
(Sanken)
GND
GND
Diode D
1
• Be sure to use a Schottky-barrier diode as D
1
. 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 L
1
• 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 C
1
, C
2
• As large ripple currents flow through C
1
and C
2
, use high-frequency and low-impedance capacitors aiming for switching-mode-power-supply use. Especially
when the impedance of C
2
is high, the switching waveform may become abnormal at low temperatures. For C
2
, 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 R
2
, R
3
• R
2
and R
3
are the resistors to set the output voltage. Set their values so that I
REF
becomes approx. 2 mA. Obtain R
2
and R
3
values by the following formula above.
* To create the optimum operating conditions, place the components as close as possible to each other.
V
REF
(V
OUT
–V
REF
) (V
OUT
–1)
1
.
= 500(Ω)
=
(Ω), R3 =
=
.
–3
–3
2×10
I
REF
2×10
I
REF
ICs
67
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