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参数资料
| 型号： | LTC3609EWKG#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/26页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 6A 52QFN |
| 标准包装： | 2,000 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 36 V |
| 输入电压： | 4 V ~ 32 V |
| PWM 型： | 电流模式 |
| 电流 - 输出： | 6A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 52-VFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 52-QFN（7x8）裸露焊盘 |
LTC3609
APPLICATIONS INFORMATION
V OUT2(MIN) = 0.6V ? 1 +
R3 ?
with changes in V IN . 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 V OUT2 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 V OUT2 will droop. An external
resistor divider from V OUT2 to the FCB pin sets a minimum
voltage V OUT2(MIN) below which continuous operation is
forced until V OUT2 has risen above its minimum:
? R4 ?
?
?
Fault Conditions: Current Limit and Foldback
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
falls by more than 25%, then the maximum sense voltage is
progressively lowered to about one sixth of its full value.
INTV CC Regulator and EXTV CC Connection
An internal P-channel low dropout regulator produces the
5V supply that powers the drivers and internal circuitry
within the LTC3609. The INTV CC pin can supply up to 50mA
RMS and must be bypassed to ground with a minimum of
4.7μF tantalum or ceramic capacitor. Good bypassing is
necessary to supply the high transient currents required
by the MOSFET gate drivers.
+
V OUT2
C SEC
1μF
IN4148
GND
SW
40 39 38 37 36 35 34 33 32 31 30 29 28 27
V OUT1
C OUT
+
T1
1:N
C IN
+
V IN
41
42
43
44
45
46
47
48
49
50
51
52
SW
SW
SW
SW
SW
SW
SW
PV IN
PV IN
PV IN
PV IN
PV IN
1
2
3
4
5
6
LTC3609
8
7
9 10 11 12 13 14
SGND
NC
NC
V FB
I ON
NC
SGND
FCB
I TH
V RNG
PGOOD
SGND
26
25
24
23
22
21
20
19
18
17
16
15
R4
OPTIONAL EXTV CC
CONNECTION
5V < V OUT2 < 7V
R3
3609 F04
SW
SGND
Figure 4. Secondary Output Loop and EXTV CC Connection
3609fb
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