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參數(shù)資料
| 型號(hào)： | LT3407-2 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Dual Synchronous,400mA/800mA, 2.25MHz Step-Down DC/DC Regulator |
| 中文描述： | 雙同步，400mA/800mA，2.25MHz降壓直流/直流穩(wěn)壓器 |
| 文件頁數(shù)： | 6/16頁 |
| 文件大?。?/td> | 239K |
| 代理商： | LT3407-2 |
LTC3548
6
3548f
The LTC3548 uses a constant frequency, current mode
architecture. The operating frequency is set at 2.25MHz
and can be synchronized to an external oscillator. Both
channels share the same clock and run in-phase. To suit
a variety of applications, the selectable Mode pin allows
the user to choose between low noise and high efficiency.
The output voltage is set by an external divider returned to
the V
FB
pins. An error amplfier compares the divided
output voltage with a reference voltage of 0.6V and adjusts
the peak inductor current accordingly. An undervoltage
comparator will pull the POR output low if the output
voltage is not above –8.5% of the reference voltage. The
POR output will go high after 262,144 clock cycles (about
117ms) of achieving regulation.
OPERATIOU
BLOCK DIAGRA
1
2
9
10
8
3
4
11
5
–
+
–
+
–
+
–
+
EA
UVDET
OVDET
0.6V
7
0.65V
0.55V
–
+
0.35V
UV
OV
I
TH
SWITCHING
LOGIC
AND
BLANKING
CIRCUIT
S
R
Q
Q
LRS
BURST
–
+
I
COMP
I
RCMP
THRU
BURST
SLOPE
COMP
EN
SLEEP
POR
COUNTER
0.6V REF
OSC
OSC
REGULATOR 2 (IDENTICAL TO REGULATOR 1)
PGOOD1
PGOOD2
SHUTDOWN
V
IN
V
IN
V
IN
6
REGULATOR 1
SW1
GND
POR
GND
SW2
5
MODE/SYNC
V
FB1
RUN1
RUN2
V
FB2
3548 BD
Main Control Loop
During normal operation, the top power switch (P-channel
MOSFET) is turned on at the beginning of a clock cycle
when the V
FB
voltage is below the the reference voltage.
The current into the inductor and the load increases until
the current limit is reached. The switch turns off and
energy stored in the inductor flows through the bottom
switch (N-channel MOSFET) into the load until the next
clock cycle.
The peak inductor current is controlled by the internally
compensated I
TH
voltage, which is the output of the error
amplifier.This amplifier compares the V
FB
pin to the 0.6V
reference. When the load current increases, the V
FB
volt-
age decreases slightly below the reference. This
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PDF描述 |
|---|---|
| LTC3548 | 12-Bit To 24-Bit Registered Bus Exchanger With 3-State Outputs 56-SSOP -40 to 85 |
| LTC3548EMSE | Dual Synchronous,400mA/800mA, 2.25MHz Step-Down DC/DC Regulator |
| LTC3701EGN | 2-Phase, Low Input Voltage, Dual Step-Down DC/DC Controller |
| LTC3701 | 16-Bit Universal Bus Driver With 3-State Outputs 48-SSOP -40 to 85 |
| LTC3708 | No RSENSE Low EMI, Synchronous DC/DC Controller with Output Tracking |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT340Z | 制造商:SEOUL 制造商全稱:Seoul Semiconductor 功能描述:GREEN OVAL LAMP LED |
| LT341 | 制造商:SEOUL 制造商全稱:Seoul Semiconductor 功能描述:BLUE OVAL LAMP LED |
| LT3412G | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Optoelectronic |
| LT341BC | 制造商:Datak Corporation 功能描述: |
| LT341L | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Optoelectronic |
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