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| 型号： | LT3741IFE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 20TSSOP |
| 标准包装： | 74 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1.07MHz |
| 电源电压： | 6 V ~ 36 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽）裸露焊盘 |
| 包装： | 管件 |
LT3741/LT3741-1
APPLICATIONS INFORMATION
Output Current Regulation
To adjust the regulated load current, an analog voltage is
applied to the CTRL1 pin. Figure 5 shows the regulated
voltage across the sense resistor for control voltages
up to 2V. Figure 6 shows the CTRL1 voltage created by
a voltage divider from V REF to ground. When sizing the
resistor divider, please be aware that the V REF pin is current
limited to 500μA. Above 1.5V, the control voltage has no
effect on the regulated inductor current.
not leave this pin open under any condition. The RT pin
is also current limited to 60μA. See Table 4 and Figure 8
for resistor values and the corresponding switching
frequencies.
Table 4. Switching Frequency
SWITCHING FREQUENCY (MHz) R T (kΩ)
1 40.2
0.750 53.6
0.5 82.5
60
50
40
0.3
0.2
V REF
143
200
30
20
10
LT3741
CTRL1
3741 F06
R2
R1
0
0
0.5
1.0
1.5
2.0
Figure 6. Analog Control of Inductor Current
V CTRL (V)
3741 F05
Figure 5. Sense Voltage vs CTRL Voltage
V OUT
Voltage Regulation and Overvoltage Protection
LT3741
R2
The LT3741 uses the FB pin to regulate the output voltage
and to provide a high speed overvoltage lockout to avoid
high voltage conditions. The regulated output voltage
is programmed using a resistor divider from the output
and ground (Figure 7). When the output voltage exceeds
125% of the regulated voltage level (1.5V at the FB pin),
the internal overvoltage flag is set, terminating switching.
The regulated output voltage must be greater than 1.5V
and is set by the equation:
FB
R1
3741 F07
Figure 7. Output Voltage Regulation and Overvoltage Protection
Feedback Connections
1.2
1.0
V OUT = 1.21V ? 1 +
R2 ?
R1 ?
?
?
?
0.8
0.6
Programming Switching Frequency
0.4
The LT3741 has an operational switching frequency range
between 200kHz and 1MHz. This frequency is programmed
with an external resistor from the RT pin to ground. Do
0.2
0
0
50 100 150 200 250 300 350 400 450 500
R T (k )
3743 F08
Figure 8. Frequency vs R T Resistance
37411fe
16
For more information www.linear.com/LT3741
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3741IFE-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Power, Constant Current, Constant Voltage, Step-Down Controller |
| LT3741IUF#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 20-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LT3741IUF#PBF | 制造商:Linear Technology 功能描述:DC-DC CONTROLLER BUCK 1MHZ 制造商:Linear Technology 功能描述:DC-DC CONTROLLER, BUCK, 1MHZ, QFN-20 |
| LT3741IUF#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 20-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LT3741IUF-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Power, Constant Current, Constant Voltage, Step-Down Controller |
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