- 您现在的位置：买卖IC网 > PDF目录67758 > LTC3809IMSE-1 (LINEAR TECHNOLOGY CORP) 1 A SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, PDSO10 PDF资料下载
参数资料
| 型号： | LTC3809IMSE-1 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | PLASTIC, MSOP-10 |
| 文件页数： | 10/24页 |
| 文件大小： | 256K |
| 代理商： | LTC3809IMSE-1 |
LTC3809-1
18
38091fc
The auxiliary output voltage VAUX is normally set, as shown
in Figure 6, by the turns ratio N of the transformer:
VAUX = (N + 1) VOUT
APPLICATIONS INFORMATION
In a hard short (VOUT = 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 (VIN) to either VOUT or GND, which prevents
excessive MOSFET and inductor heating.
Figure 6. Auxiliary Output Loop Connection
VAUX
VOUT
COUT
VIN
LTC3809-1
+
R6
R5
1μF
L1
1:N
MODE
BG
SW
TG
38091 F06
However,ifthecontrollergoesintopulse-skippingoperation
and halts switching due to a light primary load current, then
VAUX will droop. An external resistor divider from VAUX to
the MODE sets a minimum voltage VAUX(MIN):
VV
R
AUX MIN
()
.
=+
04
1
6
5
If VAUX drops below this value, the MODE voltage forces
temporary continuous switching operation until VAUX 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 (ISC), which is set by the short-circuit sense
threshold (
ΔVSC) and the on resistance (RDS(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 ISC. In this
case, the controller’s switching frequency is decreased
and the output is regulated by short-circuit (current limit)
protection.
Figure 7. Line Regulation of VREF and Maximum Sense Voltage
INPUT VOLTAGE (V)
75
NORMALIZED
VOL
TAGE
OR
CURRENT
(%)
85
95
105
80
90
100
2.2
2.4
2.6
2.8
38091 F07
3.0
2.1
2.0
2.3
2.5
2.7
2.9
VREF
MAXIMUM
SENSE VOLTAGE
Low Supply Voltage
Although the LTC3809-1 can function down to below 2.4V,
the maximum allowable output current is reduced as VIN
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 VREF.
Minimum On-Time Considerations
Minimum on-time, tON(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:
t
V
fV
ON MIN
OUT
OSC
IN
()
<
相关PDF资料 |
PDF描述 |
|---|---|
| LTC3809IDD-1 | 1 A SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, PQCC10 |
| LTC3810HUH-5#TR | SWITCHING CONTROLLER, PQCC32 |
| LTC3810HUH-5 | SWITCHING CONTROLLER, PQCC32 |
| LTC3852EUDD#PBF | 0.05 A SWITCHING CONTROLLER, 810 kHz SWITCHING FREQ-MAX, PQCC24 |
| LTC3852IUDD#TRPBF | 0.05 A SWITCHING CONTROLLER, 810 kHz SWITCHING FREQ-MAX, PQCC24 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3809IMSE-1#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 10-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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 ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3809IMSE-1#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 10-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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 ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3810EG#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 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:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
| LTC3810EG#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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 ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3810EUH-5#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 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 ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
发布紧急采购，3分钟左右您将得到回复。