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参数资料
| 型号： | LTC3809IMSE-1#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 18/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 10-MSOP |
| 标准包装： | 50 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 600kHz |
| 占空比： | 100% |
| 电源电压： | 2.75 V ~ 9.8 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 管件 |
LTC3809-1
APPLICATIONS INFORMATION
The auxiliary output voltage V AUX is normally set, as shown
in Figure 6, by the turns ratio N of the transformer:
V AUX = (N + 1) ? V OUT
In a hard short (V OUT = 0V), the top P-channel MOSFET
is turned off and kept off until the short-circuit condition
is cleared. In this case, there is no current path from
input supply (V IN ) to either V OUT or GND, which prevents
excessive MOSFET and inductor heating.
R6
LTC3809-1
TG
V IN
L1
1:N
+
1μF
V AUX
V OUT
105
100
V REF
R5
MODE
SW
+
95
MAXIMUM
SENSE VOLTAGE
BG
C OUT
90
38091 F06
Figure 6. Auxiliary Output Loop Connection
However, if the controller goes into pulse-skipping operation
and halts switching due to a light primary load current, then
V AUX will droop. An external resistor divider from V AUX to
the MODE sets a minimum voltage V AUX(MIN) :
85
80
75
2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3.0
INPUT VOLTAGE (V)
38091 F07
Figure 7. Line Regulation of V REF and Maximum Sense Voltage
V AUX ( MIN ) = 0 . 4 V ? ? 1 +
R 5 ?
?
?
R 6 ?
?
Low Supply Voltage
Although the LTC3809-1 can function down to below 2.4V,
If V AUX drops below this value, the MODE voltage forces
temporary continuous switching operation until V AUX is
again above its minimum.
Fault Condition: Short-Circuit and Current Limit
If the LTC3809-1’s load current exceeds the short-circuit
current limit (I SC ), which is set by the short-circuit sense
threshold ( Δ V SC ) and the on resistance (R DS(ON) ) of
bottom N-channel MOSFET, the top P-channel MOSFET
is turned off and will not be turned on at the next clock
cycle unless the load current decreases below I SC . In this
case, the controller’s switching frequency is decreased
and the output is regulated by short-circuit (current limit)
the maximum allowable output current is reduced as V IN
decreases below 3V. Figure 7 shows the amount of change
as the supply is reduced down to 2.4V. Also shown is the
effect on V REF .
Minimum On-Time Considerations
Minimum on-time, t ON(MIN) is the smallest amount of time
that the LTC3809-1 is capable of turning the top P-channel
MOSFET on. It is determined by internal timing delays and
the gate charge required to turn on the top MOSFET. Low
duty cycle and high frequency applications may approach
the minimum on-time limit and care should be taken to
ensure that:
protection.
t ON ( MIN ) <
V OUT
f OSC ? V IN
38091fc
18
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