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参数资料
| 型号： | LT1950EGN#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR PWM CM 16-SSOP |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 560kHz |
| 占空比： | 97% |
| 电源电压： | 3 V ~ 25 V |
| 降压： | 无 |
| 升压： | 是 |
| 回扫： | 是 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
LT1950
TYPICAL PERFOR A CE CHARACTERISTICS
BOOST Switch Off Time vs
Temperature
Maximum Duty Cycle vs
V SEC Voltage
GATE Clamp Voltage vs
Temperature
700
600
100
90
80
MAX DUTY CYCLE = (105/V SEC )%
1.25V < V SEC < 2.8V
T A = 25 ° C
16
15
14
70
500
60
13
400
300
50
40
30
12
11
10
–50 –25
0
25
50
75
100
125
0.8
1.2
1.6 2.0 2.4
2.8
3.2
–50 –25
0
25
50
75
100
125
TEMPERATURE ( ° C)
PI FU CTIO S
1950 G16
V SEC VOLTAGE (V)
1950 G17
TEMPERATURE ( ° C)
1950 G18
COMP (Pin 1): The COMP pin is the output of the error
amplifier. The error amplifier is a true op amp which allows
the use of an RC network to be connected between the
Comp and FB pins to compensate the feedback loop for
optimum transient response. The peak switch current in
the external MOSFET will be proportional to the voltage on
the COMP pin. Typical operating voltage range for this pin
is 1V to 2.5V.
FB (Pin 2): The FB pin is the inverting input to the error
amplifier. The output voltage is set with a resistor divider.
The error amplifier adjusts the peak switch current to
maintain the FB pin voltage at the value of the internal
reference voltage of 1.23V.
R OSC (Pin 3): A resistor from the R OSC pin to ground
programs the operating frequency of the LT1950. Operat-
ing frequency range is 100kHz to 500kHz. Nominal voltage
on the R OSC pin is 1V.
SYNC (Pin 4): The SYNC pin is used to synchronize the
internal oscillator to an external clock signal. The pin is
directly logic compatible and can be driven with any signal
with a duty cycle of 10% to 90%. If the SYNC function is
not used the pin can be left open circuit or connected to
ground.
SLOPE (Pin 5): The SLOPE pin is used to adjust the
amount of slope compensation. Leaving the pin open
circuit results in a default level of slope compensation. The
amount of slope compensation can be adjusted above this
default level by connecting a resistor from the SLOPE pin
to the V REF pin.
V REF (Pin 6): The V REF pin is the output of an internal 2.5V
reference. This pin is capable of sourcing up to 2.5mA for
external use. It is recommended that the V REF pin is
bypassed to ground with a 0.1 μ F ceramic capacitor.
SHDN (Pin 7): The SHDN pin is used to put the device into
a low power shutdown state. In shutdown the V IN supply
current drops to 5 μ A. The SHDN pin has an accurate
threshold of 1.32V which can be used to program an
undervoltage lockout threshold. Input current levels on
the SHDN pin can be used to program hysteresis into the
undervoltage lockout levels.
GND (Pin 8): The GND pin is the analog ground for the
internal circuitry of the LT1950. Sensitive circuitry such as
the feedback divider, frequency setting resistor, reference
bypass capacitor should be tied directly to this pin. See the
Applications Information section for recommendations
on ground connections.
1950fa
6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1950IGN | 功能描述:IC REG CTRLR PWM CM 16-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LT1950IGN#PBF | 功能描述:IC REG CTRLR PWM CM 16-SSOP 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:2,000 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:1MHz 占空比:50% 电源电压:9 V ~ 10 V 降压:无 升压:是 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:8-TSSOP（0.173"，4.40mm 宽） 包装:带卷 (TR) |
| LT1950IGN#TR | 功能描述:IC REG CTRLR PWM CM 16-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LT1950IGN#TRPBF | 功能描述:IC REG CTRLR PWM CM 16-SSOP 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:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LT1952 | 制造商:LINER 制造商全称:Linear Technology 功能描述:2-Phase Step-Up DC/DC Controller |
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