参数资料
| 型号： | LT1534IS#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 2A 16SOIC |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.5 V ~ 35 V |
| 输入电压： | 2.7 V ~ 23 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 200kHz ~ 250kHz |
| 电流 - 输出： | 2A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-SOIC |
LT1534/LT1534-1
BLOCK DIAGRA
SHDN
V IN
PGND
COL
COL
V C
LDO REGULATOR
+
NEGATIVE
OUTPUT
–
FEEDBACK
AMP
INTERNAL V CC
+
DRIVER
NFB
100k
50k
–
SLEW CONTROL
R VSL
FB
g m
COMP
R CSL
ERROR
AMP
1.25V
+
S
FF
Q
R
R T
OSCILLATOR
C T
SYNC
GND
1534 BD
OPERATIO
In noise sensitive applications, switching regulators tend
to be ruled out as a power supply option due to their
propensity for generating unwanted noise. When switch-
ing supplies are required due to efficiency or input/output
voltage constraints, great pains must be taken to work
around the noise generated by a typical supply. These
steps may include precise synchronization of the power
supply oscillator to an external clock, synchronizing the
rest of the circuit to the power supply oscillator, or halting
power supply switching during noise sensitive operations.
The LT1534 greatly simplifies the task of eliminating
supply noise by enabling the design of an inherently low
noise switching regulator power supply.
The LT1534 is a fixed frequency, current mode switching
regulator with unique circuitry to control the voltage and
current slew rates of the output switch. Slew control
capability provides much greater control over power sup-
ply components that can create conducted and radiated
electromagnetic interference. The current mode control
provides excellent AC and DC line regulation and simplifies
loop compensation.
Current Mode Control
A switching cycle begins with an oscillator discharge pulse
which resets the RS flip-flop, turning on the output driver
(refer to Block Diagram). The switch current is sensed
across an internal resistor and the resulting voltage is
amplified and compared to the output of the error amplifier
(V C pin). The driver is turned off once the output of the
current sense amplifier exceeds the voltage on the V C pin.
Internal slope compensation is provided to ensure stabil-
ity under high duty cycle conditions.
Output regulation is obtained using the error amp to set
the switch current trip point. The error amp is a transcon-
ductance amplifier that integrates the difference between
the feedback output voltage and an internal 1.25V refer-
ence. The output of the error amp adjusts the switch
current trip point to provide the required load current at
the desired regulated output voltage. This method of
controlling current rather than voltage provides faster
input transient response, cycle by cycle current limiting
for better output switch protection and greater ease in
compensating the feedback loop.
The V C pin serves three different purposes. It is used for
loop compensation, current limit adjustment and soft
starting. During normal operation the V C voltage will be
between 0.2V and 1.33V. An external clamp may be used
for lowering the current limit. A capacitor coupled to an
external clamp can be used for soft starting.
7
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相关代理商/技术参数 |
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| LT1537 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Advanced Low Power 5V RS232 Transceiver with Small Capacitors |
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| LT1537CG | 功能描述:IC TXRX 5V RS232 LOW-PWR 28-SSOP RoHS:否 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:27 系列:- 类型:收发器 驱动器/接收器数:3/3 规程:RS232，RS485 电源电压:4.75 V ~ 5.25 V 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC 包装:管件 |
| LT1537CG#PBF | 功能描述:IC TXRX 5V RS232 LOW-PWR 28-SSOP RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:27 系列:- 类型:收发器 驱动器/接收器数:3/3 规程:RS232，RS485 电源电压:4.75 V ~ 5.25 V 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC 包装:管件 |
| LT1537CG#TR | 功能描述:IC TXRX RS232 5V LP CAPS 28SSOP RoHS:否 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:27 系列:- 类型:收发器 驱动器/接收器数:3/3 规程:RS232，RS485 电源电压:4.75 V ~ 5.25 V 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC 包装:管件 |
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