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参数资料
| 型号： | LTC3810IG#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO28 |
| 封装： | 5.30 MM, PLASTIC, SSOP-28 |
| 文件页数： | 14/36页 |
| 文件大小： | 495K |
| 代理商： | LTC3810IG#TR |
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LTC3810
21
3810fb
is typically much higher than 14V a separate supply for
the IC power (INTVCC) and driver power (DRVCC) must
be used. The LTC3810 has integrated bias supply control
circuitry that allows the IC/driver supply to be easily
generated from VIN and/or VOUT with minimal external
components. There are four ways to do this as shown in
the simplied schematics of Figure 4 and explained in the
following sections.
Using the Linear Regulator for INTVCC/DRVCC Supply
In Mode 1, a small external SOT23 MOSFET, controlled by
the NDRV pin, is used to generate a 10V start-up supply
from VIN. The small SOT23 package can be used because
the NMOS is on continuously only during the brief start-up
period. As soon as the output voltage reaches 6.7V, the
LTC3810 turns off the external NMOS and the LTC3810
regulates the 10V supply from the EXTVCC pin (connected
to VOUT or a VOUT derived boost network) through an
internal low dropout regulator. For this mode to work
properly, EXTVCC must be in the range 6.7V < EXTVCC <
15V. If VOUT < 6.7V, a charge pump or extra winding can
be used to raise EXTVCC to the proper voltage, or alter-
natively, Mode 2 should be used as explained later in this
section. If VOUT is shorted or otherwise goes below the
minimum 6.5V threshold, the MOSFET connected to VIN
is turned back on to maintain the 10V supply. However if
the output cannot be brought up within a timeout period,
the drivers are turned off to prevent the SOT23 MOSFET
from overheating. Soft-start cycles are then attempted at
low duty cycle intervals to try to bring the output back up
(see Figure 10). This fault timeout operation is enabled
by choosing the choosing RNDRV such that the resistor
current INDRV is greater than 270μA by using the follow-
ing formulas:
RNDRV
PMOSFET(MAX) /ICC VTH
270
μA
where
ICC =(f) QG(TOP) + QG(BOTTOM)
()+3mA
and VTH is the threshold voltage of the MOSFET.
The value of RNDRV also affects the VIN(MIN) as
follows:
VIN(MIN) = VINTVCC(MIN) + (40μA) RNDRV +VT
(1)
where VINTVCC(MIN) is normally 6V for driving 60V to 100V
MOSFETs. If minimum VIN is not low enough, consider
reducing RNDRV and/or using a darlington NPN instead of
an NMOS to reduce VT to ~1.4V.
When using RNDRV equal to the computed value, the
LTC3810 will enable the low duty cycle soft-start retries
only when the desired maximum power dissipation,
PMOSFET(MAX), in the MOSFET is exceeded and leave the
drivers on continuously otherwise. The shutoff/restart
times are a function of the TRACK/SS capacitor value.
Figure 10. Fault Timeout Operation
APPLICATIONS INFORMATION
SS/TRACK
VOUT
TG/BG
FAULT TIMEOUT
ENABLED
EXTVCC UV THRESHOLD
DRIVER OFF THRESHOLD
DRIVER POWER
FROM VIN
SHORT-CIRCUIT EVENT
START-UP INTO SHORT-CIRCUIT
START-UP
DRIVER POWER
FROM VOUT
DRIVER POWER
FROM VIN
ISS/TRACK = 1.4 A (SOURCE)
ISS/TRACK = 0.1 A (SINK)
3810 F10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3810IUH-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: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) |
| LTC3810IUH-5#TRPBF | 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: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) |
| LTC3811EG#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 36-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 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) |
| LTC3811EG#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 36-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 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) |
| LTC3811EUHF#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 38-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 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) |
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