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参数资料
| 型号： | LT3412AEFE#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 3 A SWITCHING REGULATOR, 4 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | 4.4 MM, LEAD FREE, PLASTIC, TSSOP-16 |
| 文件页数： | 19/20页 |
| 文件大小： | 267K |
| 代理商： | LT3412AEFE#PBF |
LTC3412A
8
3412afb
Main Control Loop
The LTC3412A is a monolithic, constant-frequency, cur-
rent-mode step-down DC/DC converter. During normal
operation, the internal top power switch (P-channel
MOSFET) is turned on at the beginning of each clock cycle.
Current in the inductor increases until the current com-
parator trips and turns off the top power MOSFET. The
peak inductor current at which the current comparator
shuts off the top power switch is controlled by the voltage
on the ITH pin. The error amplifier adjusts the voltage on
the ITH pin by comparing the feedback signal from a
resistor divider on the VFB pin with an internal 0.8V
reference. When the load current increases, it causes a
reduction in the feedback voltage relative to the reference.
The error amplifier raises the ITH voltage until the average
inductor current matches the new load current. When the
top power MOSFET shuts off, the synchronous power
switch (N-channel MOSFET) turns on until either the
bottom current limit is reached or the beginning of the next
clock cycle. The bottom current limit is set at –1.3A for
forced continuous mode and 0A for Burst Mode operation.
OPERATIO
U
–
+
2
7
4
–
+
–
+
0.74V
ERROR
AMPLIFIER
SYNC/MODE
BURST
COMPARATOR
BCLAMP
NMOS
CURRENT
COMPARATOR
PMOS CURRENT
COMPARATOR
REVERSE
CURRENT
COMPARATOR
0.86V
RUN
RUN/SS
15
13
12
14
11
SW
P-CH
N-CH
10
PGOOD
3
ITH
VFB
0.8V
5
RT
6
SYNC/MODE
3412 FBD
16
PVIN
9
8
SGND
1
SVIN
SLOPE
COMPENSATION
VOLTAGE
REFERENCE
OSCILLATOR
LOGIC
SLOPE
COMPENSATION
RECOVERY
–
+
–
+
–
PGND
+
–
FUNCTIONAL BLOCK DIAGRA
UU
W
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