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參數(shù)資料
| 型號(hào)： | LTC1478CS |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 外設(shè)及接口 |
| 英文描述： | Low-Power LinCMOS(TM) Dual Comparator 8-CDIP -55 to 125 |
| 中文描述： | 2.4 A BUF OR INV BASED PRPHL DRVR, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SOP-16 |
| 文件頁(yè)數(shù)： | 5/8頁(yè) |
| 文件大小： | 224K |
| 代理商： | LTC1478CS |
5
LTC1477/LTC1478
OPERATIO
Input TTL-CMOS Converter
The LTC1477 enable input is designed to accommodate a
wide range of 3V and 5V logic families. The input threshold
voltage is approximately 1.4V with 100mV of hysteresis.
The input enables the bias generator, the gate charge
pump and the protection circuitry. Therefore, when the
enable input is turned off, the entire circuit is powered
down and the supply current drops below 1
μ
A.
U
(LTC1477 or single channel of LTC1478)
Ramped Switch Control
The LTC1477 gate charge pump includes circuitry which
ramps the NMOS switch on slowly (1ms typical rise time)
but turns it off much more quickly (typically 20
μ
s).
Bias, Oscillator and Gate Charge Pump
When the switch is enabled, a bias current generator and
high frequency oscillator are turned on. The on-chip
capacitive charge pump generates approximately 12V of
gate drive for the internal low R
DS(ON)
NMOS switch from
the power supply. No external 12V supply is required to
switch the output.
Switch Protection
Two levels of protection are designed into the power
switch in the LTC1477. The switch is protected against
accidental short circuits with a current limit circuit which
limits the output current to typically 2A when the output is
shorted to ground. The LTC1477 also has thermal shut-
down set at approximately 130
°
C which limits the power
dissipation to safe levels.
LTC1478 Operation
The LTC1478 dual protected switch can be thought of as
two independent LTC1477 single protected switches. The
input supply voltages may be rom separate power sources.
The ground connection, however, is common to both
channels and must be connected to the same potential.
(LTC1477 or single channel of LTC1478)
BLOCK DIAGRA
M
W
APPLICATIO
S I
FOR
ATIO
U
Tailoring I
LIMIT
and R
DS(ON)
for Load Requirements
The LTC1477 is designed to current limit at approximately
2A during a short circuit with all the V
IN
pins connected to
the input power supply. It is possible however, to reduce
this current by selectively disconnecting two of the four
power supply pins (V
IN2
and V
IN3
). Table 1 lists the effects
of disconnecting these pins on R
DS(ON)
and short-circuit
current limit
W
U
U
Table 1. Effects of Disconnecting V
IN2
and V
IN3
ALL V
IN
PINS
CONNECTED
R
DS(ON)
0.07
I
LIMIT
2A
Note: 5V Operation
V
IN3
V
IN2
AND V
IN3
DISCONNECTED
0.12
0.85A
DISCONNECTED
0.09
1.5A
Note that there is an inverse relationship between output
current limit and switch resistance. This allows the tailor-
TTL-TO-CMOS
CONVERTER
OSCILLATOR
AND BIAS
CHARGE
PUMP
GATE CHARGE
AND
DISCHARGE
CONTROL LOGIC
CURRENT LIMIT
AND THERMAL
SHUTDOWN
EN
V
INS
V
IN1
V
IN2
V
IN3
V
OUT
LTC1477/1478 BD01
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