参数资料
型号: LT8415IDDB#TRPBF
厂商: Linear Technology
文件页数: 7/12页
文件大小: 0K
描述: IC REG BOOST ADJ 25MA 12DFN
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: 2.5 V ~ 40 V
输入电压: 2.5 V ~ 16 V
PWM 型: 电流模式
频率 - 开关: 800kHz
电流 - 输出: 25mA
同步整流器:
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 12-WFDFN 裸露焊盘
包装: 带卷 (TR)
供应商设备封装: 12-DFN-EP(3x2)
LT8415
TIMING DIAGRAM
2V
IN1,IN2
VOLTAGE
0V
OUT1,OUT2
VOLTAGE
34V
RISE
TIME
30V
FALL
DELAY
0V
RISE
4V
FALL
OPERATION
DELAY
TIME
8415 TD
Switching Regulator
The LT8415 utilizes a variable peak current, variable off-
time control scheme to provide high ef?ciency over a wide
output current range.
The operation of the part can be better understood by
referring to the Block Diagram. The part senses the
output voltage by monitoring the internal FB node, and
servoing the FB node voltage to be equal to the FBP
pin voltage. The chip integrates an accurate high value
resistor divider (12.4MEG/0.4MEG) from the V OUT pin.
The output voltage is set by the FBP pin voltage, which
in turn is set by an external resistor divider from the V REF
pin. The FBP pin voltage can also be directly biased with
an external reference, allowing full control of the output
voltage during operation.
The Switch Control block senses the output of the ampli-
?er and adjusts the switching frequency as well as other
parameters to achieve regulation. During the start-up of
the circuit, special precautions are taken to ensure that
the inductor current remains under control.
The LT8415 also has a PMOS output disconnect switch.
The PMOS switch is turned on when the part is enabled
via the SHDN pin. When the part is in shutdown, the
PMOS switch turns off, allowing the V OUT node to go to
ground. This type of disconnect function is often required
in power supplies.
Half-Bridge
The N-channel and P-channel MOSFETs in each half-bridge
are synchronously controlled by a single input pin, and
will never turn on at the same time in typical applications,
protecting against shoot-through current. The OUT1 and
OUT2 pins are the same polarity as the IN1 and IN2 pins
respectively. When the part is disabled, both N-channel
and P-channel MOSFETs turn off, and the OUT1 and OUT2
pins will become high impedance with a 20MΩ pull down
resistor connected to ground.
8415f
7
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