S1F78100Y2A Epson Electronics America, Inc., S1F78100Y2A Datasheet - Page 68

• Manufacturer Part Number: S1F78100Y2A
• Description: High Precision Voltage Regulators
• Manufacturer: Epson Electronics America, Inc.

Table 2.6 Setup of reference voltage and temperature coefficient
Notes: 1. The reference voltage is given at Ta = 25 C.
The temperature coefficient (C
cient (C
Notes on TC1 and TC2 pin replacement:
Voltage Regulator Circuit
The voltage regulator circuit regulates a voltage entered
in the V
series voltage regulation. As shown in Figure 2.5, the
V
short as possible except for larger time boosting by us-
ing external diodes.
As shown by equation (1), any output voltage can be set
by the ratio of external division resistors R1 and R2.
The sum of division resistance is recommended to be
S1F70000 Series
Technical Manual
Reference Voltage Circuit
The S1F76540 has a built-in reference voltage circuit
for voltage regulation. The regulated voltage (ex-
plained in the next “voltage regulator circuit” section) is
set depending on the division ratio between this refer-
Mode
RI
• When replacing the TC1 and TC2 pins after power-on, always select the power-off mode (P
C
C
C
C
and replace them by each other.
and V
T0
T1
T2
T3
T
RI
) means that the |V
2. The reference voltage and temperature coefficient of the chip products may vary depending
O
pin and can output any voltage. It uses the
pins must be short-circuited by a jumper as
(High = V
on the moldings used on each chip. Use these chips only after the temperature test.
(Low = V
High
High
TC1
Low
Low
C
T
=
DD
I
)
) (High = V
| V
REF
(Low = V
T
REF
| value decreases when the temperature rises.
) is defined by the following equation. The negative sign of the temperature coeffi-
High
High
TC2
Low
Low
(50 C) | – | V
50 C – 0 C
DD
I
)
)
–1.55
–1.70
–1.90
–2.15
Min.
REF
Reference voltage,
(0 C) |
EPSON
V
REF
Typ.
–1.5
–1.5
–1.5
–1.5
small as possible to avoid an external noise interfer-
ence. As the current consumed by division resistors
(equation (2)) flows, the 100
mended to use.
The temperature coefficient of the regulated voltage is
equal to the temperature coefficient of the reference
voltage that is explained in the “reference voltage cir-
cuit” section.
ence voltage and the external resistance. The reference
voltage can be used to change the temperature coeffi-
cient at pins TC1 and TC2. One of four states can be
selected as listed on Table 2.6.
(V)
| V
REF
–1.45
–1.30
–1.10
–0.85
Max.
100
(25 C) |
–0.07
–0.25
–0.45
–0.75
Temperature coefficient,
Min.
C
S1F76540 Series
T
to 1M
–0.04
–0.15
–0.35
–0.55
Typ.
(%/ C)
OFF1
= P
are recom-
OFF2
–0.07
–0.20
–0.30
Max.
0
2–25
= V
I
)