S1F78100Y2A Epson Electronics America, Inc., S1F78100Y2A Datasheet - Page 142
S1F78100Y2A
Manufacturer Part Number
S1F78100Y2A
Description
High Precision Voltage Regulators
Manufacturer
Epson Electronics America, Inc.
Datasheet
1.S1F78100Y2A.pdf
(258 pages)
- Current page: 142 of 258
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PACKAGE MARKINGS
The markings on S1F79100Y series device packages
use the following abbreviations.
Note
The reflow furnace temperature profile requirements
must be satisfied during package reflow. Avoid solder-
ing on surface mount package (including SOT89) as it
causes a quick temperature change of package and a
device damage.
FUNCTIONAL DESCRIPTIONS
Basic Operation
The S1F79100Y series uses a 3-pin series regulator
feedback loop. An operational amplifier compares
V
with V
transistor gate bias to equalize the voltages and com-
pensate for fluctuations in V
The following equation shows the relationship between
V
V
S1F70000 Series
Technical Manual
Output voltage code
Voltage regulator code
REG
O
O
and V
= — — — — — V
V
I
R
from the voltage divider formed by R
REF
1
Parameter
R
+ R
REF
1
. The amplifier output adjusts the output
.
2
V
REF
REF
–
+
I
.
Code Description
B
D
P
N
R
V
R
REG
1
2
Negative
Positive
5 V
3 V
1
GND
V
and R
O
EPSON
2
,
Marking locations
Internal Circuits
Reference voltage generator
The offset structure used in all three transistors results
in a high breakdown voltage that ensures a stable refer-
ence voltage output over a wide range of input voltages.
V
SS
Voltage regulator
code
V
1
Enhancement
Depletion
Depletion
S1F79100Y Series
mode
mode
mode
V
REF
Output voltage
code
3–35
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