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參數(shù)資料
| 型號： | LT1871EMS-7 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 30/32頁 |
| 文件大?。?/td> | 461K |
| 代理商： | LT1871EMS-7 |
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LTC1871-7
7
18717fc
PIN FUNCTIONS
MODE/SYNC (Pin 5): This input controls the operating
mode of the converter and allows for synchronizing the
operating frequency to an external clock. If the MODE/
SYNC pin is connected to ground, Burst Mode operation
is enabled. If the MODE/SYNC pin is connected to INTVCC,
or if an external logic-level synchronization signal is ap-
plied to this input, Burst Mode operation is disabled and
the IC operates in a continuous mode.
GND (Pin 6): Ground Pin.
GATE (Pin 7): Gate Driver Output.
INTVCC (Pin 8): The Internal 7V Regulator Output. The
gate driver and control circuits are powered from this
voltage. Decouple this pin locally to the IC ground with
a minimum of 4.7μF low ESR tantalum or ceramic ca-
pacitor. This 7V regulator has an undervoltage lockout
circuit with 5.6V and 4.6V rising and falling thresholds,
respectively.
VIN (Pin 9): Main Supply Pin. Must be closely decoupled
to ground.
SENSE (Pin 10): The Current Sense Input for the Control
Loop. Connect this pin to a resistor in the source of the
power MOSFET. Alternatively, the SENSE pin may be con-
nected to the drain of the power MOSFET, in applications
where the maximum VDS is less than 36V. Internal leading
edge blanking is provided for both sensing methods.
BLOCK DIAGRAM
–
+
–
+
1.230V
85mV
OV
50k
EA
UV
TO
START-UP
CONTROL
BURST
COMPARATOR
S
R
Q
LOGIC
PWM LATCH
CURRENT
COMPARATOR
0.30V
1.230V
7V
–
+
5.6V UP
4.6V DOWN
1.230V
SLOPE
1.230V
ILOOP
FB
ITH
–
+
gm
3
MODE/SYNC
5
FREQ
4
2
INTVCC
8
LDO
V-TO-I
OSC
V-TO-I
SLOPE
COMPENSATION
BIAS AND
START-UP
CONTROL
VIN
BIAS
VREF
IOSC
RLOOP
–
+
–
+
C1
SENSE
10
GND
18717 BD
6
GATE
INTVCC
GND
7
VIN
1.248V
9
RUN
C2
1
0.6V
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1871EMS-7-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Input Voltage,Current Mode Boost, Flyback and SEPIC Controller |
| LT1871EMS-7-TR | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Input Voltage,Current Mode Boost, Flyback and SEPIC Controller |
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