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參數(shù)資料
| 型號： | LT1375 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 抗輻射高效，5安培開關(guān)穩(wěn)壓器 |
| 文件頁數(shù)： | 4/28頁 |
| 文件大?。?/td> | 232K |
| 代理商： | LT1375 |
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4
LT1375/LT1376
Kool M
μ
is a registered trademark of Magnetics, Inc.
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
A
= 25
°
C. T
J
= 25
°
C, V
IN
= 15V, V
C
= 1.5V, boost open, switch open,
unless otherwise noted.
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
Gain is measured with a V
C
swing equal to 200mV above the low
clamp level to 200mV below the upper clamp level.
Note 3:
Minimum input voltage is not measured directly, but is guaranteed
by other tests. It is defined as the voltage where internal bias lines are still
regulated so that the reference voltage and oscillator frequency remain
constant. Actual minimum input voltage to maintain a regulated output will
depend on output voltage and load current. See Applications Information.
Note 4:
This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the internal power switch.
Note 5:
Boost current is the current flowing into the BOOST pin with the
pin held 5V above input voltage. It flows only during switch-on time.
Note 6:
Input supply current is the bias current drawn by the input pin
when the BIAS pin is held at 5V with switching disabled. Output supply
current is the current drawn by the BIAS pin when the bias pin is held at
5V. Total input referred supply current is calculated by summing input
supply current (I
SI
) with a fraction of output supply current (I
SO
):
I
TOT
= I
SI
+ (I
SO
)(V
OUT
/V
IN
)(1.15)
With V
IN
= 15V, V
OUT
= 5V, I
SI
= 0.9mA, I
SO
= 3.6mA, I
TOT
= 2.28mA.
For the LT1375, quiescent current is equal to:
I
TOT
= I
SI
+ I
SO
(1.15)
because the BIAS pin is internally connected to V
IN
.
Note 7:
Switch-on resistance is calculated by dividing V
IN
to V
SW
voltage
by the forced current (1.5A). See Typical Performance Characteristics for
the graph of switch voltage at other currents.
Note 8:
Transconductance and voltage gain refer to the internal amplifier
exclusive of the voltage divider. To calculate gain and transconductance
refer to sense pin on fixed voltage parts. Divide values shown by the ratio
V
OUT
/2.42.
The
G
denotes specifications which apply over the full operating
PARAMETER
Shutdown Thresholds
CONDITIONS
V
C
Open
MIN
0.15
0.25
0.15
0.25
TYP
0.37
0.45
0.37
0.45
MAX
0.60
0.60
0.70
0.70
UNITS
Device Shutting Down
Device Starting Up
G
G
V
V
V
V
V
C
Open
LT1375HV/LT1376HV Device Shutting Down
LT1375HV/LT1376HV Device Starting Up
G
G
Minimum Synchronizing Amplitude (LT1375 Only)
Synchronizing Range (LT1375 Only)
SYNC Pin Input Resistance
V
IN
= 5V
G
1.5
2.2
900
V
580
kHz
k
40
INDUCTANCE (
μ
H)
0
5
C
C
1.0
0.1
0.01
0.001
10
15
20
20
12
8
4
2
1.2
0.8
0.4
0.2
0.12
0.08
0.04
0.02
25
1375/76 G01
TYPE 52
POWDERED IRON
Kool M
μ
PERMALLOY
μ
= 125
V
OUT
= 5V, V
IN
= 10V, I
OUT
= 1A
CORE LOSS IS
INDEPENDENT OF LOAD
CURRENT UNTIL LOAD CURRENT FALLS
LOW ENOUGH FOR CIRCUIT TO GO INTO
DISCONTINUOUS MODE
Inductor Core Loss
TYPICAL PERFOR
M
A
CE CHARACTERISTICS
U
DUTY CYCLE (%)
0
S
2.5
2.0
1.5
1.0
0.5
0
80
1375/76 G08
20
40
60
100
TYPICAL
GUARANTEED MINIMUM
Switch Peak Current Limit
JUNCTION TEMPERATURE (
°
C)
–50
2.44
2.43
2.42
2.41
2.40
100
1375/76 G09
–25
0
25
50
75
125
F
C
μ
A
2.0
1.5
1.0
0.5
0
VOLTAGE
CURRENT
Feedback Pin Voltage and Current
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