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參數(shù)資料
| 型號： | LT3641IUFD#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3.4 A DUAL SWITCHING CONTROLLER, 2350 kHz SWITCHING FREQ-MAX, PQCC28 |
| 封裝： | 4 X 5 MM, LEAD FREE, PLASTIC, MO-220, QFN-28 |
| 文件頁數(shù)： | 5/28頁 |
| 文件大?。?/td> | 416K |
| 代理商： | LT3641IUFD#PBF |
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LT3641
13
3641f
Figure 1. Lower Switching Frequency Occurs in High
Voltage Channel When Required On-Time Is Below 50ns
The high voltage nonsynchronous channel operates from
the VIN pin. The minimum VIN voltage to regulate output
voltage is:
VIN(MIN) =
VOUT1 + VD
DCMAX
VD + VCE
Where VDistheforwardvoltagedropofthecatchdiode,VCE
is the voltage drop of the internal NPN power switch, and
DCMAX is the maximum duty cycle (refer to the Switching
Frequency section). If VIN is below the calculated minimum
voltage, output will lose regulation.
The maximum VIN should not exceed the absolute
maximum rating. For xed frequency operation, the
maximum VIN is:
VIN(MAX) =
VOUT1 + VD
DCMIN
VD + VCE
Note that the high voltage buck will still regulate at an
input voltage that exceeds VIN(MAX) (up to 42V). It will
continue to regulate through transients up to 55V for one
second. Note that the switching frequency will be reduced
once the on-time required to satisfy the above equation is
below 50ns (Figure 1).
VIN2 Voltage Range
The low voltage synchronous channel operates from
the VIN2 pin. The VIN2 pin can be connected to either an
independent voltage supply or the high voltage channel
output for a two-stage power regulator. The VIN2 voltage
range is 2.3V ~ 5.5V
The minimum VIN2 voltage to regulate output voltage at
full frequency is:
VIN2(MIN) ≈
VOUT2
DCMAX
Where DCMAXisthemaximumdutycycle(refertoSwitching
Frequency section). If VIN2isbelowthecalculatedminimum
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 VIN2 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 VIN2 for xed frequency operation is:
VIN2(MAX) ≈
VOUT2
DCMIN
Where DCMIN is the minimum duty cycle (refer to the
Switching Frequency section). For voltage that exceeds
VIN2(MAX) (up to 5.5V), the low voltage channel exhi-
bits pulse-skipping behavior, and the output ripple will
increase.
Inductor Selection
Inductor selection involves inductance, saturation current,
series resistance (DCR) and magnetic loss.
The inductance for the high voltage channel is:
L1
= 1.7
VOUT1 + VD
fS
APPLICATIONS INFORMATION
200ns/DIV
SW1
10V/DIV
IL1
0.5A/DIV
3641 F01
VIN = 30V
VOUT1 = 3.3V/0.2A
RT SET = 2MHz
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