参数资料
型号: LT3641EFE#TRPBF
厂商: Linear Technology
文件页数: 13/28页
文件大小: 0K
描述: IC REG BUCK SYNC ADJ DL 28TSSOP
标准包装: 2,500
类型: 降压(降压)
输出类型: 可调式
输出数: 2
输出电压: 可调至 1.265V,可调至 0.6V
输入电压: 2.5 V ~ 42 V
PWM 型: 电流模式,混合
频率 - 开关: 500kHz ~ 2MHz
电流 - 输出: 1.3A,1.1A
同步整流器: 两者兼有
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 28-SOIC(0.173",4.40mm 宽)裸露焊盘
包装: 带卷 (TR)
供应商设备封装: 28-TSSOP 裸露焊盘
LT3641
APPLICATIONS INFORMATION
The high voltage nonsynchronous channel operates from
the V IN pin. The minimum V IN voltage to regulate output
voltage is:
V IN2 Voltage Range
The low voltage synchronous channel operates from
the V IN2 pin. The V IN2 pin can be connected to either an
V IN(MIN) = ? OUT1
? V + V D ?
? DC MAX ? ?
? V D + V CE
independent voltage supply or the high voltage channel
output for a two-stage power regulator. The V IN2 voltage
range is 2.3V ~ 5.5V
V IN2(MIN) ≈
V IN(MAX) = ? OUT1
? ? ? V D + V CE
WhereV D istheforwardvoltagedropofthecatchdiode,V CE
is the voltage drop of the internal NPN power switch, and
DC MAX is the maximum duty cycle (refer to the Switching
Frequency section). If V IN is below the calculated minimum
voltage, output will lose regulation.
The maximum V IN should not exceed the absolute
maximum rating. For ?xed frequency operation, the
maximum V IN is:
? V + V D ?
? DC MIN
Note that the high voltage buck will still regulate at an
input voltage that exceeds V IN(MAX) (up to 42V). It will
continue to regulate through transients up to 55V for one
The minimum V IN2 voltage to regulate output voltage at
full frequency is:
V OUT2
DC MAX
Where DC MAX is the maximum duty cycle (refer to Switching
Frequency section). If V IN2 is below the calculated minimum
voltage, the low voltage channel starts to skip oscillator
clock. In this case, the low voltage channel switching
frequency will no longer be the programmed frequency.
As the V IN2 voltage further decreases, the top MOSFET
will remain on 100% duty cycle. In the case, the output
starts to fall out of regulation.
The maximum V IN2 for ?xed frequency operation is:
second. Note that the switching frequency will be reduced
once the on-time required to satisfy the above equation is
below 50ns (Figure 1).
V IN2(MAX) ≈
V OUT2
DC MIN
Where DC MIN is the minimum duty cycle (refer to the
Switching Frequency section). For voltage that exceeds
V IN2(MAX) (up to 5.5V), the low voltage channel exhi-
bits pulse-skipping behavior, and the output ripple will
SW1
10V/DIV
I L1
increase.
Inductor Selection
0.5A/DIV
Inductor selection involves inductance, saturation current,
200ns/DIV
3641 F01
series resistance (DCR) and magnetic loss.
V IN = 30V
V OUT1 = 3.3V/0.2A
R T SET = 2MHz
The inductance for the high voltage channel is:
Figure 1. Lower Switching Frequency Occurs in High
Voltage Channel When Required On-Time Is Below 50ns
L1 = 1.7 ?
V OUT1 + V D
f S
3641fa
13
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