参数资料
| 型号： | LT1935ES5#TRM |
| 厂商： | Linear Technology |
| 文件页数： | 4/8页 |
| 文件大小： | 0K |
| 描述： | IC REG BST FLYBK SEPIC TSOT23-5 |
| 标准包装： | 500 |
| 类型： | 升压（升压），回扫，Sepic |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.27 V ~ 38 V |
| 输入电压： | 2.3 V ~ 16 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.2MHz |
| 电流 - 输出： | 2A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-5 细型，TSOT-23-5 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | TSOT-23-5 |
| 其它名称： | LT1935ES5 LT1935ES5-ND |
LT1935
PI FU CTIO S
SW (Pin 1): Switch Pin. Connect inductor/diode here.
Minimize trace area at this pin to reduce EMI.
GND (Pin 2): Ground. Tie directly to local ground plane.
FB (Pin 3): Feedback Pin. Reference voltage is 1.265V.
Connect resistive divider tap here. Minimize trace area at
FB. Set V OUT according to V OUT = 1.265V(1 + R1/R2).
BLOCK DIAGRA
SHDN (Pin 4): Shutdown Pin. Tie to 1.8V or more to enable
device. Ground to shut down. This pin also provides a soft-
start function; see Applications Information section.
V IN (Pin 5): Input Supply Pin. Must be locally bypassed.
V IN 5
1.265V
REFERENCE
+
COMPARATOR
1 SW
A1
DRIVER
FB 3
–
R C
A2
R
Q
Q1
SHDN 4
C C
S
+
V OUT
R1 (EXTERNAL)
Σ
RAMP
GENERATOR
x15
–
0.01 ?
FB
R2 (EXTERNAL)
1.2MHz
OSCILLATOR
2 GND
1935 BD
Figure 2. Block Diagram
OPERATIO
The LT1935 uses a constant frequency, current mode
control scheme to provide excellent line and load regula-
tion.Operationcanbebestunderstoodbyreferringtothe
Block Diagram in Figure 2. At the start of each oscillator
cycle, the SR latch is set, turning on the power switch Q1.
A voltage proportional to the switch current is added to a
stabilizing ramp and the resulting sum is fed into the
positive terminal of the PWM comparator, A2. When this
voltage exceeds the level at the negative input of A2, the
SR latch is reset, turning off the power switch. The level
is simply an amplified version of the difference between
the feedback voltage and the reference voltage of 1.265V.
In this manner, the error amplifier sets the correct peak
current level to keep the output in regulation. If the error
amplifier’s output increases, more current is delivered to
the output; if it decreases, less current is delivered. A
clamp on the output of A1 (not shown) limits the switch
current to 3A. A1’s output is also clamped to the voltage
on the SHDN pin, providing a soft-start function by con-
trolling the peak switch current during start-up.
at the negative input of A2 is set by error amplifier A1, and
1935f
4
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相关代理商/技术参数 |
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| LT1935ES5TRMPBF | 制造商:Linear Technology 功能描述:DC-DC Converter Step-Up 2.3-16V TSOT23-5 |
| LT1936 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Monolithic Dual Tracking 3A Step-Down Switching |
| LT1936EMS8E | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 3.6V to 36V 8-Pin MSOP EP 制造商:Linear Technology 功能描述:SP-SWREG/Monolithic, 36V, 1.4A, 500kHz. Step-Down in MS8E |
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