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參數(shù)資料
| 型號： | LTC1753CG |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Isolated Flyback Switching Regulator with 9V Output |
| 中文描述： | SWITCHING CONTROLLER, 350 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | 0.209 INCH, PLASTIC, SSOP-20 |
| 文件頁數(shù)： | 3/24頁 |
| 文件大?。?/td> | 269K |
| 代理商： | LTC1753CG |
3
LTC1753
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
When I
FB
is taken below GND, it will be clamped by an internal diode.
This pin can handle input currents greater than 100mA below GND without
latchup. In the positive direction, it is not clamped to V
CC
or PV
CC
.
Note 3:
All currents into device pins are positive; all currents out of the
device pins are negative. All voltages are referenced to ground unless
otherwise specified.
Note 4:
The Power Good and FAULT trip thresholds are tested at the 1.8V
output voltage code. The Power Good and FAULT trip thresholds are
guaranteed by design for all other output voltage codes to the same
specification.
Note 5:
The LTC1753 goes into the shutdown mode if VID0 to VID4 are
floating. Due to the internal pull-up resistors, there will be an additional
0.25mA/pin if any of the VID0 to VID4 pins are pulled low.
Note 6
: Supply current in normal operation is dominated by the current
needed to charge and discharge the external FET gates. This will vary with
SYMBOL
G
ERR
g
mERR
BW
ERR
I
IMAX
I
SS
I
SSIL
PARAMETER
Error Amplifier Open-Loop DC Gain
Error Amplifier Transconductance
Error Amplifier –3dB Bandwidth
I
MAX
Sink Current
Soft-Start Source Current
Maximum Soft-Start Sink Current
Under Current Limit
Soft-Start Sink Current Under Hard
Current Limit
Hard Current Limit Hold Time
Power Good Response Time
↑
Power Good Response Time
↓
FAULT Response Time
Overtemperature Driver Disable
Driver Rise and Fall Time
Driver Nonoverlap Time
VID0 to VID4 Input High Voltage
VID0 to VID4 Input Low Voltage
SENSE Input Resistance
VID0 to VID4 Internal Pull-Up
Resistance
Digital Output Sink Current
CONDITIONS
(Note 7)
(Note 7)
COMP = Open (Note 11)
V
IMAX
= V
CC
V
SS
= 0V, V
IMAX
= 0V, V
IFB
= V
CC
V
SENSE
= V
OUT
, V
IMAX
= V
CC
, V
IFB
= 0V
(Notes 8, 9), V
SS
= V
CC
V
SENSE
= 0V, V
IMAX
= V
CC
, V
IFB
= 0V
MIN
40
0.9
TYP
54
1.6
400
190
–12
60
MAX
UNITS
G
dB
G
2.3
millimho
kHz
μ
A
μ
A
μ
A
G
150
–16
30
230
–8
150
G
G
I
SSHIL
G
20
45
mA
t
SSHIL
t
PWRGD
t
PWRBAD
t
FAULT
V
OTDD
V
SHDN
t
r
, t
f
t
NOL
V
IH
V
IL
R
SENSE
R
VID
V
SENSE
= 0V, V
IMAX
= 4V, V
IFB
↓
from 5V
V
SENSE
↑
from 0V to Rated V
OUT
V
SENSE
↓
from Rated V
OUT
to 0V
V
SENSE
↑
from Rated V
OUT
to V
CC
OUTEN
↓
, VID0 to VID4 = 0 (Note 10) (Figure 3)
OUTEN
↓
, VID0 to VID4 = 0 (Note 10) (Figure 3)
(Figure 4)
(Figure 4)
500
1
500
500
1.7
μ
s
ms
μ
s
μ
s
G
0.5
200
200
1.6
2
G
1000
1000
1.8
0.8
150
G
G
V
V
G
G
90
100
ns
ns
V
V
k
k
G
30
2
G
G
0.8
108
20
G
10
I
SINK
G
10
mA
the LTC1753 operating frequency, supply voltage and the external FETs
used.
Note 7:
The open-loop DC gain and transconductance from the SENSE pin to
COMP pin will be (G
ERR
)(1.26/3.3) and (g
mERR
)(1.26/3.3) respectively.
Note 8:
The current limiting amplifier can sink but cannot source current.
Under normal (not current limited) operation, the output current will be zero.
Note 9:
Under typical soft current limit, the net soft-start discharge current
will be 60
μ
A (I
SSIL
) + [–12
μ
A(I
SS
)]
48
μ
A. The soft-start sink-to-source
current ratio is designed to be 5:1.
Note 10:
When VID0 to VID4 are all HIGH, the LTC1753 will be forced to
shut down internally. The OUTEN trip voltages are guaranteed by design for
all other input codes.
Note 11:
This parameter is guaranteed by design and correlation and is not
tested in production.
ELECTRICAL CHARACTERISTICS
The
G
denotes specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25
°
C.
V
CC
= 5V, PV
CC
= 12V, unless otherwise noted. (Note 3)
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