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參數(shù)資料
| 型號： | LTC1473L |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Dual General Purpose LinCMOS(TM) Differential Comparator 8-SOIC -40 to 125 |
| 中文描述： | 雙低電壓PowerPathTM開關(guān)驅(qū)動(dòng)器 |
| 文件頁數(shù)： | 7/16頁 |
| 文件大小： | 211K |
| 代理商： | LTC1473L |
LTC 1473L
7
OPERATIOU
The LTC1473L is responsible for low-loss switching and
isolation for a dual supply system, where during a power
backup situation, a battery pack can be connected or
disconnected seamlessly. Smooth switching between in-
put power sources is accomplished with the help of
low-loss N-channel switches. They are driven by special
gate drive circuitry which limits the inrush current in and
out of the battery packs and the system power supply
capacitors.
All N-Channel Switching
The LTC1473L drives external back-to-back N-channel
MOSFET switches to direct power from two sources: the
primary battery and the secondary battery, or a battery and
a DC power supply. (N-channel MOSFET switches are
more cost effective and provide lower voltage drops than
their P-channel counterparts.)
Gate Drive (V
GG
) Power Supply
The gate drive for the low-loss N-channel switches is
supplied by an internal micropower boost regulator which
is regulated at approximately 8.5V above V
+
, up to 20V
maximum. In a DC supply and backup battery system, the
LTC1473L V
+
pin is diode ORed through two external
Schottky diodes connected to the two main power sources,
DCIN and BAT1. Thus, V
GG
is regulated at 8.5V above the
higher power source and will provide the overdrive
required to fully enhance the MOSFET switches.
For maximum efficiency the input to the boost regulator
inductor is connected to V
+
as shown in Figure 1. C1
provides filtering to the input of the 1mH switched induc-
tor, L1, which is housed in a small surface mount package.
An internal diode directs the current from the 1mH induc-
tor to the V
GG
output capacitor C2.
Inrush and Short-Circuit Current Limiting
The LTC1473L uses an adaptive inrush current limiting
scheme to reduce current flowing in and out of the battery
and the following system’s input capacitor during switch-
over transitions. The voltage across a single small valued
resistor, R
SENSE
, is measured to ascertain the instanta-
neous current flowing through either of the two switch
pairs, SW A1/B1 and SW A2/B2, during the transitions.
Figure 2 shows a block diagram of a switch driver pair, SW
A1/B1. A bidirectional current sensing and limiting circuit
determines when the voltage drop across R
SENSE
reaches
±
200mV. The gate-to-source voltage, V
GS
, of the appro-
priate switch is limited during the transition period until
the inrush current subsides.
This scheme allows capacitors and MOSFET switches of
differing sizes and current ratings to be used in the same
system without circuit modifications.
Figure 1. V
GG
Switching Regulator
Figure 2. SW A1/B1 Inrush Current Limiting
BAT1
DCIN
V
+
SW
GND
1473 F01
V
GG
L1
1mH
C1
1
μ
F
25V
C2
1
μ
F
25V
TO GATE
DRIVERS
(8.5V + V
+
)
LTC1473L
V
GG
SWITCHING
REGULATOR
V
SENSE+
V
SENSE–
GA1
GB1
SAB1
SW A1
SW B1
R
SENSE
1473 F02
BAT1
+
OUTPUT
LOAD
C
OUT
V
GG
LTC1473L
6V
6V
±
200mV
THRESHOLD
SW A/B
GATE
DRIVERS
BIDIRECTIONAL
INRUSH CURRENT
SENSING AND
LIMITING
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