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| 型号： | LT1795ISW#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/12页 |
| 文件大小： | 0K |
| 描述： | IC AMP CURR FEEDBACK DUAL 20SOIC |
| 标准包装： | 1,000 |
| 放大器类型： | 电流反馈 |
| 电路数： | 2 |
| 转换速率： | 900 V/µs |
| -3db带宽： | 65MHz |
| 电流 - 输入偏压： | 10µA |
| 电压 - 输入偏移： | 3000µV |
| 电流 - 电源： | 29mA |
| 电流 - 输出 / 通道： | 1A |
| 电压 - 电源，单路/双路(±)： | ±5 V ~ 15 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 20-SO |
| 包装： | 带卷 (TR) |
8
LT1795
1795fa
APPLICATIO S I FOR ATIO
WU
U
Figure 5. Setting Amplifier Supply Current
Level with ON/OFF Control, Version 1
Figure 6. Setting Multiple Amplifier Supply
Current Levels with ON/OFF Control, Version 2
10 SHDN
INTERNAL
LOGIC THRESHOLD
~1.4V
RSHDN
V+
11 SHDNREF
1795 F05
RB
10k
Q1
OFF
(0V)
ON
(3.3V/5V)
Q1: 2N3904 OR EQUIVALENT
10 SHDN
RPULLUP
>500k
RSHDN2
V+
11 SHDNREF
1795 F06
RB2
10k
Q1B
ON
OFF
RB1
10k
Q1A
ON
OFF
Q1A, Q1B: ROHM IMX1 or FMG4A (W/INTERNAL RB)
RSHDN1
(3.3V/5V)
(0V)
Figure 7. Setting Amplifier Supply Current Level
with ON/OFF Control, Version 3
10
SHDN
REXT
11
SHDNREF
1795 F07
ON
OFF
ISY
CONTROL
INTERNAL
LOGIC THRESHOLD
~ 1.4V
IPROG 0.5mA
FOR REXT = 0
(SEE SHDN PIN
CURRENT vs
VOLTAGE
CHARACTERISTIC)
(3.3V/5V)
(0V)
IPROG
Figure 8. Partial Shutdown
10
SHDN
R1
R2
11
SHDNREF
1795 F08
ON
OFF
ISY
CONTROL
INTERNAL
LOGIC THRESHOLD
~ 1.4V
(3.3V/5V)
(0V)
VCC
Figure 8 illustrates a partial shutdown with direct logic
control. By keeping the output stage slightly biased on, the
output impedance remains low, preserving the line termi-
nation. The design equations are:
R
V
II
R
VV
I
H
S
ON
S
OFF
CC
SHDN
H
S
ON
S
OFF
S
OFF
1
115
2
115
= () ()
=
()
(
) () ()
+
()
–
/
–
where
VH = Logic High Level
(IS)ON = Supply Current Fully On
(IS)OFF = Supply Current Partially On
VSHDN = Shutdown Pin Voltage ≈1.4V
VCC = Positive Supply Voltage
THERMAL CONSIDERATIONS
The LT1795 contains a thermal shutdown feature that
protects against excessive internal (junction) temperature.
If the junction temperature of the device exceeds the
protection threshold, the device will begin cycling between
normal operation and an off state. The cycling is not
harmful to the part. The thermal cycling occurs at a slow
rate, typically 10ms to several seconds, which depends on
the power dissipation and the thermal time constants of the
package and heat sinking. Raising the ambient tempera-
quiescent current to 33mA with VS = ±15V. If ON/OFF
control is desired in addition to reduced quiescent current,
then the circuits in Figures 5 to 7 can be employed.
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