S-8327 Seiko, S-8327 Datasheet - Page 23

• Manufacturer Part Number: S-8327
• Description: (S-8323 / S-8327) SMALL PACKAGE PWM CONTROL STEP-UP SWITCHING REGULATOR
• Manufacturer: Seiko

SMALL PACKAGE PWM CONTROL STEP-UP SWITCHING REGULATOR
S-8323/8327 Series
Output
Voltage
V
22
OUT
5. Voltage Inverting Type DC/DC Converter
6. Power Supply for GaAs and MR Head
(V)
-3.05
-3.03
-3.01
-2.99
-2.97
-2.95
Set R
The following are an application negative power supply circuit for GaAs and MR head, and its characteristics when 3V
(3V ±10%) and 5V (5V±10%) are used for the applied power. Set V
The Start circuit is not needed because the power is supplied from V
When V
connect V
the efficiency to be improved. On the other hand, the switching loss of the Tr becomes large and consequently the
efficiency will be worsend. Select R
(a)Output Current - Output Voltage
0.01
b
to 60
CC
is -2 V, - 3 V and - 5 V, use the S-8323D20MC, the S-8323D30MC and the S-8323D50MC respectively. Always
OUT
V
V
Output Current I
IN
IN
to GND without attaching R
or more and R
0.1
+
-
C
+
-
C
IN
IN
1.
R
OUT
E
E
to 6 k
750
R
(mA)
2SA1362/Toshiba
E
R
V
V
Tr
E
b
DD
DD
CONT
to ensure high efficiency under operating conditions.
CONT
or less. The larger R
10.
R
2k
Figure 24
S-8323D30
b
A
S-8323D
, R
VIN=2.7V
VIN=3.0V
VIN=4.5V
VIN=5.0V
A
B
.
Seiko Instruments Inc.
Figure 23
100.
Efficiency
V
V
V
V
Figure 25
(%)
OUT
OUT
SS
SS
CD54/100 H
E
, the smaller the reactive current through R
MA720
100
SD
(b)Output Current - Efficiency
80
60
40
20
0
0.01
IN
DD
to 9V-|V
to the IC. Set V
C
OUT
V
Output Current I
CC
R
R
VIN=2.7V
VIN=3.0V
VIN=4.5V
VIN=5.0V
CC
-
A
+
B
| or less.
0.1
F93
47 F
-3V
-
+
C
IN
OUT
to 9V-|V
OUT
V
1.
CC
CC
| or less.
(mA)
E
10.
and R
b
, allowing
100.