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參數(shù)資料
| 型號(hào)： | LTC1980 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | RS-232 |
| 英文描述： | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| 中文描述： | 5V的高速RS - 232收發(fā)器與0.1uF電容 |
| 文件頁數(shù)： | 7/16頁 |
| 文件大?。?/td> | 463K |
| 代理商： | LTC1980 |
LTC1980
7
1980i
REG (Pin 15):
Bidirectional Regulator Mode Control Pin. A
pull-up resistor is required between this pin and V
BIAS2
.
This pin is open when charging normally, has a weak pull-
down (approximately 5
μ
A) when conditioning the battery
and a strong pull-down when in regulator mode. Pulling
this pin low forces the IC into regulator mode.
MODE (Pin 16):
Selects different operating modes in both
charger and DC/DC converter configurations. Also en-
ables and disables Burst Mode operation. See Mode Pin
Operation table in Application section.
TIMER (Pin 17):
A timing capacitor on this pin determines
the normal charge time for charge termination.
C(
μ
F) = 0.25 Time (Hours)
V
BAT
(Pin 18):
This pin connects to the positive terminal of
the battery and the battery side of the power converter.
V
BIAS2
(Pin 19):
Internally Generated Voltage. Bypass this
pin with a 1
μ
F or larger ceramic capacitor (or other low
ESR capacitor). Do not connect any load to this pin.
GND (Pin 20):
Signal Ground. This pin should Kelvin-
connect to the current sense resistor (R
SENSE
).
I
SENSE
(Pin 21):
Current Sense Input Pin. Connects inter-
nally to a current amplifier and zero current comparator.
This pin should Kelvin-connect to the current sense resis-
tor (R
SENSE
) .
CAOUT (Pin 22):
Current Amplifier Output. A program
resistor connects between this pin and PROGT (Pin 2) to
set the charge current (in constant-current mode).
OVP (Pin 23):
Overvoltage Protection. This pin connects
to the tap on an optional external voltage divider con-
nected across the battery. This allows nonstandard float
voltages to be used for the battery charger. Overvoltage,
restart and undervoltage thresholds will also be affected
by the external voltage division ratio. To use this pin,
BATT1 (Pin 9) must float.
SS (Pin 24):
Soft-Start. A capacitor between this pin and
ground sets the battery charge ramp rate. Battery charge
current is very low the moment after the converter switches
from DC/DC converter (regulator) mode to battery charger
mode then ramps up to final battery charge current from
there. This insures that the wall adapter is not loaded down
with a large inrush current that could prevent correct
battery charger operation.
The same capacitor, which sets the soft-start ramp rate,
also sets the compensation for the battery float voltage
control loop.
PIU
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