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參數(shù)資料
| 型號： | LTC3610IWP |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, PQCC64 |
| 封裝： | 9 X 9 MM, PLASTIC, QFN-64 |
| 文件頁數(shù)： | 6/24頁 |
| 文件大?。?/td> | 388K |
| 代理商： | LTC3610IWP |
LTC3610
3610ff
applications inForMation
INTVCCRegulatorandEXTVCCConnection
An internal P-channel low dropout regulator produces the
5V supply that powers the drivers and internal circuitry
withintheLTC3610.TheINTVCCpincansupplyupto50mA
RMS and must be bypassed to ground with a minimum of
4.7F tantalum or ceramic capacitor. Good bypassing is
necessary to supply the high transient currents required
by the MOSFET gate drivers.
The EXTVCC pin can be used to provide MOSFET gate drive
and control power from the output or another external
source during normal operation. Whenever the EXTVCC
pin is above 4.7V the internal 5V regulator is shut off and
an internal 50mA P-channel switch connects the EXTVCC
pin to INTVCC. INTVCC power is supplied from EXTVCC
until this pin drops below 4.5V. Do not apply more than
7V to the EXTVCC pin and ensure that EXTVCC ≤ VIN. The
following list summarizes the possible connections for
EXTVCC:
1. EXTVCC grounded. INTVCC is always powered from the
internal 5V regulator.
2. EXTVCCconnectedtoanexternalsupply.Ahighefficiency
supply compatible with the MOSFET gate drive require-
ments (typically 5V) can improve overall efficiency.
3. EXTVCC connected to an output derived boost network.
The low voltage output can be boosted using a charge
pump or flyback winding to greater than 4.7V. The
system will start-up using the internal linear regulator
until the boosted output supply is available.
Soft-StartandLatchoffwiththeRUN/SSPin
TheRUN/SSpinprovidesameanstoshutdowntheLTC3610
as well as a timer for soft-start and overcurrent latchoff.
Pulling the RUN/SS pin below 0.8V puts the LTC3610 into
a low quiescent current shutdown (IQ < 30A). Releasing
the pin allows an internal 1.2A current source to charge
up the external timing capacitor CSS. If RUN/SS has been
pulled all the way to ground, there is a delay before start-
ing of about:
tDELAY =
1.5V
1.2
A
CSS = 1.3s/F
(
)CSS
Figure4.SecondaryOutputLoopandEXTVCCConnection
LTC3610
SGND
48
SGND
47
SGND
46
SGND
45
EXTVCC
44
VFB
43
SGND
42
ION
41
R4
SGND
40
FCB
39
ITH
38
VRNG
37
PGOOD
36
VON
35
SGND
34
SGND
GND
33
PV
IN
17
PV
IN
18
PV
IN
19
PV
IN
20
PV
IN
21
PV
IN
22
PV
IN
23
PV
IN
24
PV
IN
25
SW
26
NC
27
SGND
28
BOOST
29
RUN/SS
30
SGND
31
SGND
32
PGND
64
PGND
63
PGND
62
PGND
61
PGND
60
PGND
59
PGND
58
PGND
57
PGND
56
SW
55
INT
V CC
54
INT
V CC
53
SV
IN
52
SV
IN
51
SGND
50
SGND
49
PGND
1
PGND
2
PGND
3
SW
4
SW
5
SW
6
SW
7
SW
8
SW
9
SW
10
SW
11
PVIN
VIN
12
PVIN
13
PVIN
14
PVIN
15
PVIN
16
3610 F04
CSEC
1F
VOUT2
VOUT1
COUT
CIN
IN4148
OPTIONAL EXTVCC
CONNECTION
5V < VOUT2 < 7V
T1
1:N
R3
+
+
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