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參數(shù)資料
| 型號： | LTC1775CGN |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Quadruple 2-Input Positive-NAND Gate 14-TVSOP -40 to 85 |
| 中文描述： | 2 A SWITCHING CONTROLLER, 165 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SSOP-16 |
| 文件頁數(shù)： | 14/24頁 |
| 文件大?。?/td> | 289K |
| 代理商： | LTC1775CGN |
14
LTC1775
EXTV
CC
Connection
The LTC1775 contains an internal P-channel MOSFET
switch connected between the EXTV
CC
and INTV
CC
pins.
Whenever the EXTV
CC
pin is above 4.7V the internal 5.2V
regulator shuts off, the switch closes and INTV
CC
power is
supplied via EXTV
CC
until EXTV
CC
drops below 4.5V. This
allows the MOSFET gate drive and control power to be
derived from the output or other external source during
normal operation. When the output is out of regulation
(start-up, short circuit) power is supplied from the internal
regulator. Do not apply greater than 7V to the EXTV
CC
pin
and ensure that EXTV
CC
≤
V
IN
.
Significant efficiency gains can be realized by powering
INTV
CC
from the output, since the V
IN
current supplying
the driver and control currents will be scaled by a factor of
Duty Cycle/Efficiency. For 5V regulators this simply means
connecting the EXTV
CC
pin directly to V
OUT
. However, for
3.3V and other lower voltage regulators, additional cir-
cuitry is required to derive INTV
CC
power from the output.
The following list summarizes the four possible connec-
tions for EXTV
CC
:
1. EXTV
CC
left open (or grounded). This will cause INTV
CC
to be powered from the internal 5.2V regulator resulting
in a low current efficiency penalty of up to 10% at high
input voltages.
2. EXTV
CC
connected directly to V
OUT
. This is the normal
connection for a 5V regulator and provides the highest
efficiency.
D1
6.8V
R1
1775 F06
Q1
EXTV
CC
V
IN
Figure 6. EXTV
CC
Power Supplied from V
IN
3. EXTV
CC
connected to an output-derived boost network.
For 3.3V and other low voltage regulators, efficiency
gains can still be realized by connecting EXTV
CC
to an
output-derived voltage which has been boosted to
greater than 4.7V. This can be done with either an
inductive boost winding as shown in Figure 5a or a
capacitive charge pump as shown in Figure 5b.
4. EXTV
CC
connected to an external supply. If an external
supply is available in the 5V to 7V range (EXTV
CC
< V
IN
),
it may be used to power EXTV
CC
.
Figure 6 shows how one can easily generate a suitable
EXTV
CC
voltage from V
IN
. This circuit still derives the gate
drive current from V
IN
, but it removes the power dissipa-
tion from the LTC1775 internal regulator and increases the
gate drive voltage.
Figure 5a: Secondary Output Loop and EXTV
CC
Connection
Figure 5b: Capacitive Charge Pump for EXTV
CC
V
IN
TK
LTC1775
EXTV
CC
SGND
FCB
TG
SW
OPTIONAL
EXTV
CC
CONNECTION
5V < V
SEC
< 7V
R3
R4
1775 F05a
T1
1:N
BG
PGND
+
C
SEC
1
μ
F
V
OUT
V
SEC
V
IN
+
C
IN
1N4148
+
C
OUT
V
IN
TK
LTC1775
EXTV
CC
V
PUMP
≈
2(V
OUT
– V
D
) < 7V
TG
SW
1775 F05b
L1
BG
PGND
+
C
OUT
V
OUT
BAT85
BAT85
BAT85
VN2222LL
V
IN
+
C
IN
+
1
μ
F
0.22
μ
F
Note that R
DS(ON)
also varies with the gate drive level. If
gate drives other than the 5.2V INTV
CC
are used, this must
be accounted for when selecting the MOSFET R
DS(ON)
.
Particular care should be taken with applications where
EXTV
CC
is connected to the output. When the output
APPLICATIOU
W
U
U
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