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參數(shù)資料
| 型號： | LT3741EUF#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 1070 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封裝： | 4 X 4 MM, LEAD FREE, PLASTIC, MO-220WGGD-1, QFN-20 |
| 文件頁數(shù)： | 8/24頁 |
| 文件大?。?/td> | 243K |
| 代理商： | LT3741EUF#TRPBF |
LT3741
16
3741fb
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 VREF to ground. When sizing the
resistor divider, please be aware that the VREF pin is current
limited to 500μA. Above 1.5V, the control voltage has no
effect on the regulated inductor current.
APPLICATIONS INFORMATION
LT3741
VREF
R2
R1
3741 F06
CTRL1
Figure 5. Sense Voltage vs CTRL Voltage
Figure 6. Analog Control of Inductor Current
VCTRL (V)
0
V
SENSE
+ –
V
SENSE
– (mV)
10
20
30
40
50
60
0.5
1.0
1.5
3741 F05
2.0
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)
RT (kΩ)
1
40.2
0.750
53.6
0.5
82.5
0.3
143
0.2
200
Figure 7. Output Voltage Regulation and Overvoltage Protection
Feedback Connections
LT3741
R2
VOUT
R1
3741 F07
FB
RT (kΩ)
0
FREQUENCY
(MHz)
0.4
0.8
1.2
0.2
0.6
1.0
100
200
300
400
3743 F08
500
50
0
150
250
350
450
Figure 8. Frequency vs RT Resistance
Voltage Regulation and Overvoltage Protection
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 ag is set, terminating switching.
The regulated output voltage must be greater than 1.5V
and is set by the equation:
V
OUT = 1.21V 1+
R2
R1
Programming Switching Frequency
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
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT3741IFE#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 20TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LT3741IFE#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 20TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LT3741IFE-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Power, Constant Current, Constant Voltage, Step-Down Controller |
| LT3741IFE-TRPBF | 制造商:LINER 制造商全稱: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 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
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