- 您现在的位置：买卖IC网 > PDF目录15310 > LT1950EGN#TR (Linear Technology)IC REG CTRLR PWM CM 16-SSOP PDF资料下载
参数资料
| 型号： | LT1950EGN#TR |
| 厂商： | Linear Technology |
| 文件页数： | 12/20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
APPLICATIO S I FOR ATIO
N-channel power MOSFET even though V IN voltage is very
low. High GATE drive voltage reduces MOSFET R DS(ON) ,
improves efficiency and increases the range of MOSFETs
that can be selected. A small switching regulator at the
BOOST pin, with fixed current limit and fixed off time,
generates the V IN2 supply. With an external inductor
connected between the BOOST pin and V IN (see Figure 5),
the BOOST pin will draw current until approximately
125mA is reached, turn off for 0.5 μ s and then turn back on.
The cycle is repeated for as long as the switcher is enabled.
By using a diode connected from BOOST to V IN2 and a
capacitor from V IN2 to ground, energy from the external
inductor is transferred to the V IN2 capacitor during the off-
time of the internal switcher. An auxiliary boost converter
is realized providing a supply to the V IN2 pin. The typical
inductor current, V IN2 voltage and BOOST pin voltage
waveforms are shown in Figure 5. When V IN2 reaches 11V,
the internal switcher is disabled. Since V IN2 supplies the
output driver of the LT1950, switching at the GATE pin will
eventually discharge the V IN2 capacitor until V IN2 reaches
a lower level of approximately 10V. At this level the internal
switcher is re-enabled and switches until V IN2 returns to
12
11V. This hysteretic (burst mode) operation for the inter-
nal switcher minimizes power dissipation from V IN .
The V REF output is a 2.5V reference supplying most of the
LT1950 control circuitry. It is available for external use
with maximum current capability of 2.5mA. The pin should
be bypassed to ground using a 0.1 μ F capacitor. Internal
undervoltage lockout thresholds for V IN and V IN2 of ap-
proximately 2.6V and 6.8V respectively must be exceeded
before V REF becomes active.
Programming Oscillator Frequency
The oscillator frequency of the LT1950 is programmed
using an external resistor connected between the R OSC pin
and ground. Figure 6 shows typical f OSC vs R OSC resistor
values. The LT1950 is programmable for a free-running
oscillator frequency in the range of 100kHz to 500kHz.
Stray capacitance and potential noise pickup on the R OSC
pin should be minimized by placing the R OSC resistor as
close as possible to the R OSC pin and keeping the area of
the R OSC node as small as possible. The ground side of the
R OSC resistor should be returned directly to the GND
(analog ground) pin.
500
(V)
10
0.25
(A)
0
0.25
(A)
V IN2
I D1
I L1
MIN
3V
V IN
BOOST
LT1950
V IN2
L1
D1
450
400
350
300
250
(V)
0
15
BOOST
C1
200
150
0
5 μ s/DIV
1950 F05
100
50 100 150 200 250 300 350 400 450 500
R OSC (k ? )
1950 F06
Figure 5. V IN2 Generation Using the BOOST Pin
Figure 6. Oscillator Frequency (f OSC ) vs R OSC
1950fa
12
相关PDF资料 |
PDF描述 |
|---|---|
| ASC05DRYI-S93 | CONN EDGECARD 10POS DIP .100 SLD |
| LTC3866EUF#TRPBF | IC REG CTRLR BUCK PWM CM 24-QFN |
| LT3759HMSE#PBF | IC REG CTRLR BST INV PWM 12-MSOP |
| LT1725CGN#TR | IC REG CTRLR FLYBK ISO CM 16SSOP |
| UCA2V330MHD1TN | CAP ALUM 33UF 350V 20% RADIAL |
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 |
发布紧急采购，3分钟左右您将得到回复。