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參數(shù)資料
| 型號： | LTC3609IWKG#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, PQCC52 |
| 封裝： | 8 X 7 MM, LEAD FREE, PLASTIC, QFN-52 |
| 文件頁數(shù)： | 7/26頁 |
| 文件大?。?/td> | 414K |
| 代理商： | LTC3609IWKG#PBF |
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LTC3609
3609fb
applicaTions inForMaTion
with changes in VIN. Tying the FCB pin below the 0.6V
threshold forces continuous synchronous operation, al-
lowing current to reverse at light loads and maintaining
high frequency operation.
In addition to providing a logic input to force continuous
operation, the FCB pin provides a means to maintain a
flyback winding output when the primary is operating
in discontinuous mode. The secondary output VOUT2 is
normally set as shown in Figure 4 by the turns ratio N
of the transformer. However, if the controller goes into
discontinuous mode and halts switching due to a light
primary load current, then VOUT2 will droop. An external
resistor divider from VOUT2 to the FCB pin sets a minimum
voltage VOUT2(MIN) below which continuous operation is
forced until VOUT2 has risen above its minimum:
VOUT2(MIN) =0.6V 1+
R4
R3
FaultConditions:CurrentLimitandFoldback
The LTC3609 has a current mode controller which inher-
ently limits the cycle-by-cycle inductor current not only
in steady-state operation but also in transient. To further
limit current in the event of a short circuit to ground, the
LTC3609 includes foldback current limiting. If the output
fallsbymorethan25%,thenthemaximumsensevoltageis
progressively lowered to about one sixth of its full value.
INTVCCRegulatorandEXTVCCConnection
An internal P-channel low dropout regulator produces the
5V supply that powers the drivers and internal circuitry
withintheLTC3609.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.
Figure4.SecondaryOutputLoopandEXTVCCConnection
CSEC
1F
VOUT2
VOUT1
COUT
CIN
IN4148
T1
1:N
+
+
3609 F04
VIN
LTC3609
SGND
26
NC
25
NC
24
VFB
23
ION
22
NC
21
SGND
20
FCB
19
ITH
18
VRNG
17
PGOOD
16
SGND
15
GND
PV
IN
1
PV
IN
2
PV
IN
3
PV
IN
4
PV
IN
5
PV
IN
6
PV
IN
7
SW
SGND
SW
8
NC
9
SGND
10
BOOST
11
RUN/SS
12
V ON
13
SGND
14
PGND
40
PGND
39
PGND
38
PGND
37
PGND
36
PGND
35
PGND
34
SW
33
INT
V CC
32
INT
V CC
31
SV
IN
30
EXT
V CC
29
NC
28
SGND
27
SW
41
SW
42
SW
43
SW
44
SW
45
SW
46
SW
47
PVIN
48
PVIN
49
PVIN
50
PVIN
51
PVIN
52
R4
OPTIONAL EXTVCC
CONNECTION
5V < VOUT2 < 7V
R3
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