參數(shù)資料
型號: LTC1779
廠商: Linear Technology Corporation
英文描述: 250mA Low Dropout Current Mode Step-Down DC/DC Converter in SOT-23(2.5V輸出,250mA電流模式,低壓差,步降DC/DC變換器(SOT-23封裝))
中文描述: 250mA的低壓差電流模式降壓DC / DC轉(zhuǎn)換器采用SOT - 23(2.5V的輸出,250mA的電流模式,低壓差,步降直流/直流變換器(采用SOT - 23封裝))
文件頁數(shù): 4/12頁
文件大小: 174K
代理商: LTC1779
4
LTC1779
(Refer to Functional Diagram)
Main Control Loop
The LTC1779 is a constant frequency current mode switch-
ing regulator. During normal operation, the internal
P-channel power MOSFET is turned on each cycle when
the oscillator sets the RS latch (RS1) and turned off when
the current comparator (ICMP) resets the latch. The peak
inductor current at which ICMP resets the RS latch is
controlled by the voltage on the I
TH
/RUN pin, which is the
output of the error amplifier EAMP. An external resistive
divider connected between V
OUT
and ground allows the
EAMP to receive an output feedback voltage V
FB
. When the
load current increases, it causes a slight decrease in V
FB
relative to the 0.8V reference, which in turn causes the
I
TH
/RUN voltage to increase until the average inductor
current matches the new load current.
The main control loop is shut down by pulling the I
TH
/RUN
pin low. Releasing I
TH
/RUN allows an internal 0.5
μ
A
current source to charge up the external compensation
network. When the I
TH
/RUN pin reaches 325mV, the main
control loop is enabled with the I
TH
/RUN voltage then
pulled up to its zero current level of approximately 0.7V.
As the external compensation network continues to charge
SWITCHING
LOGIC AND
BLANKING
CIRCUIT
OVERTEMP
DETECT
+
+
+
0.15V
0.5
μ
A
0.3V
SLEEP
OVP
SHORT-CIRCUIT
DETECT
BURST
CMP
SHDN
1.2V
UV
1779FD
V
REF
+
60mV
V
REF
0.8V
V
IN
RS1
R
VOLTAGE
REFERENCE
SLOPE
COMP
ICMP
S
Q
FREQ
FOLDBACK
OSC
SENSE
V
IN
5
2
4
+
EAMP
V
FB
3
+
SW
6
V
IN
2
1
×
24
×
I
TH
/RUN
V
IN
0.325V
V
0.8V
1
+
SHDN
CMP
0.3V
GND
+
UNDERVOLTAGE
LOCKOUT
V
IN
FU
W
OPERATIOU
相關(guān)PDF資料
PDF描述
LTC1798CS8 Micropower Low Dropout References(可調(diào)輸出,微功耗,低壓差穩(wěn)壓器)
LTC1798CS8-5 Micropower Low Dropout References(5V輸出,微功耗,低壓差穩(wěn)壓器)
LTC1798CS8-2.5 Micropower Low Dropout References(2.5V輸出,微功耗,低壓差穩(wěn)壓器)
LTC1798CS8-3 Micropower Low Dropout References(3V輸出,微功耗,低壓差穩(wěn)壓器)
LTC1798CS8-4.1 Micropower Low Dropout References(4.1V輸出,微功耗,低壓差穩(wěn)壓器)
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