参数资料
型号: LTC3613IWKH#TRPBF
厂商: Linear Technology
文件页数: 21/36页
文件大小: 0K
描述: IC REG BUCK SYNC ADJ 15A 56QFN
标准包装: 2,000
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 0.6 V ~ 5.5 V
输入电压: 4.5 V ~ 24 V
PWM 型: 电流模式
频率 - 开关: 200kHz ~ 1MHz
电流 - 输出: 15A
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: 56-VFQFN 裸露焊盘
包装: 带卷 (TR)
供应商设备封装: 56-QFN 多焊盘(7x9)
LTC3613
APPLICATIONS INFORMATION
EXTERNAL
SUPPLY
V OUT
EXTERNAL
SUPPLY
V OUT
TIME
Coincident Tracking
TIME
Ratiometric Tracking
3613 F06
Figure 6. Two Different Modes of Output Tracking
EXT. V
V OUT
EXT. V
V OUT
TO
TRACK/SS
R FB2
R FB2
TO V OSNS+
TO
TRACK/SS
R1
R2
R1+ R2
0.6V
EXT. V
R FB2
TO V OSNS+
R FB1
R FB1
TO V OSNS–
R2
R FB1
TO V OSNS–
3613 F07
Coincident Tracking Setup
Ratiometric Tracking Setup
Figure 7. Setup for Coincident and Ratiometric Tracking
Phase and Frequency Synchronization
For applications that require better control of EMI and
switching noise or have special synchronization needs,
the LTC3613 can phase and frequency synchronize the
turn-on of the switching cycle to an external clock signal
applied to the MODE/PLLIN pin. The applied clock signal
needs to be within ±30% of the RT pin programmed free-
running frequency to assure proper frequency and phase
lock. The clock signal levels should generally comply to V IH
> 2V and V IL < 0.5V. The MODE/PLLIN pin has an internal
600k pull-down resistor to ensure pulse-skipping mode
if the pin is left floating.
The LTC3613 uses the voltages on SV IN and V OUT pins as
well as the RT programmed frequency to determine the
steady-state on-time as follows:
An internal PLL system adjusts this on-time dynamically
in order to maintain phase and frequency lock with the
external clock. The LTC3613 will maintain phase and fre-
quency lock under steady-state conditions for V IN , V OUT
and load current.
As shown in the previous equation, the on-time is a
function of the switching regulator’s output. This output
is measured by the V OUT pin and is used to calculate the
required on-time. Therefore, simply connecting V OUT to
the regulator’s local output point is preferable for most
applications. However, there could be applications where
the internally calculated on-time differs significantly from
the real on-time required by the application. For example,
if there are differences between the local output point and
the remotely regulated output point due to line losses, then
the internally calculated on-time will be inaccurate. Lower
t ON ≈
V OUT
V IN ? f
efficiencies in the switching regulator can also cause the
real on-time to be significantly different from the internally
3613fa
21
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