- 您现在的位置：买卖IC网 > PDF目录15273 > LTC3802EGN#TR (Linear Technology)IC REG CTRLR BUCK PWM VM 28-SSOP PDF资料下载
参数资料
| 型号： | LTC3802EGN#TR |
| 厂商： | Linear Technology |
| 文件页数： | 9/28页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 28-SSOP |
| 标准包装： | 2,500 |
| 系列： | PolyPhase® |
| PWM 型： | 电压模式 |
| 输出数： | 2 |
| 频率 - 最大： | 850kHz |
| 占空比： | 92% |
| 电源电压： | 3 V ~ 30 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： | 28-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
第1页第2页第3页第4页第5页第6页第7页第8页当前第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页
LTC3802
PI FU CTIO S
(28-Pin SSOP/32-Pin QFN Package)
FBT (Pin 8/Pin 5): Feedback Tracking Input. FBT should be
connected through a resistive divider network to V OUT1 to
set the channel 1 output slew rate. Upon power-up/-down,
the LTC3802 servos FBT and CMPIN2 to the same poten-
tial to control the output power-up/-down slew rate. To
program both outputs to have the same slew rate, dupli-
cate the CMPIN2 resistive divider at FBT. To have a
ratiometric slew rate, short FBT to CMPIN1. To disable the
tracking function, short FBT to CMPIN2.
CMPIN1 (Pin 9/Pin 6): Channel 1 Controller Comparators
Input. CMPIN1 should be connected through a resistive
divider network to V OUT1 to monitor its real time output
voltage. To improve transient response, a feedforward
capacitor can be added to the resistive divider. The power
good comparators, overvoltage comparator and Burst
reset comparators monitor this node directly. CMPIN1 is
a sensitive pin, avoid coupling noise into this pin.
COMP1 (Pin 10/Pin 7): Channel 1 Controller Error Ampli-
fier Output. The COMP1 pin is connected directly to the
channel 1 error amplifier output and the input of the line
feedforward circuit. Use an RC network between the
COMP1 pin and the FB1 pin to compensate the feedback
loop for optimum transient response. Under start-up
conditions, the potential at RUN/SS controls the slew rate
at COMP1.
FB1 (Pin 11/Pin 8): Channel 1 Controller Error Amplifier
Input. FB1 should be connected through a resistive divider
network to V OUT1 to set the channel 1 switcher output
voltage. Also, connect the channel 1 switcher loop com-
pensation network to FB1.
SGND (Pin 12/Pin 9): Signal Ground. All the internal low
power circuitry returns to the SGND pin. Connect to a low
impedance ground, separated from the PGND node. All
feedback, compensation and soft-start connections should
return to SGND. SGND and PGND should be connected
only at a single point, near the PGND pin and the negative
terminal of the V IN bypass capacitor.
FCB (Pin 13/Pin 10): Force Continuous Bar. Internally
pulled high. When FCB is shorted to GND, the controller
forces both converters to maintain continuous synchro-
nous operation regardless of load current.
EXTREF (Pin 11, QFN Package Only): External Reference.
The EXTREF pin and the internal bandgap voltage are used
as the switcher control loop’s reference in a diode OR
manner. If the potential at the EXTREF pin is less than 0.6V,
it overrides the internal reference and lowers the switcher
output voltages. If EXTREF potential is more than 1V, the
internal bandgap voltage controls both channel output
voltages. EXTREF has no effect on the PGOOD threshold.
EXTREF is internally connected to the RUN/SS pin in the
GN28 package.
RUN/SS (Pin 14/Pin 12): Run Control and Soft-Start
Input. An internal 7 μ A current source pull-up and an
external capacitor to ground at this pin sets the start-up
delaly (approximately 300ms/ μ F), the output ramp rate
and the time delay for soft current limit. Forcing this pin
below 0.8V with an open-drain/collector transistor shuts
down the device. Pulling RUN/SS high with a current
greater than 10 μ A can result in malfunctioning of tracking
during start-up. Pulling RUN/SS high with currents higher
than 50 μ A can interfere with current limit protection.
PGOOD (Pin 15/Pin 13): Open-Drain Power Good Output.
PGOOD is pulled to ground under shutdown condition or
when any switcher output voltage is not within ± 10% of its
set point .
V INFF (Pin 16/Pin 14): Line Feedforward Compensation
Input. Connects to the V IN power supply to provide line
feedforward compensation. A change in V IN immediately
modulates the input to the PWM comparator and changes
the pulse width in an inversely proportional manner, thus
bypassing the feedback loop and providing excellent tran-
sient line regulation. V INFF is a sensitive pin, an external
lowpass filter can be added to this pin to prevent noisy
signals from affecting the loop gain.
3802f
9
相关PDF资料 |
PDF描述 |
|---|---|
| VI-J5K-EW-F4 | CONVERTER MOD DC/DC 40V 100W |
| H2BXG-10108-L4-ND | JUMPER-H1501TR/A2015L/X 8" |
| VI-J5K-EW-F3 | CONVERTER MOD DC/DC 40V 100W |
| LTC3731HG#TRPBF | IC REG CTRLR BUCK PWM CM 36-SSOP |
| VI-J5K-EW-F2 | CONVERTER MOD DC/DC 40V 100W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3802EUH | 功能描述:IC REG CTRLR BUCK PWM VM 32-QFN RoHS:否 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: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 |
| LTC3802EUH#PBF | 功能描述:IC REG CTRLR BUCK PWM VM 32-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: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 |
| LTC3802EUH#TR | 功能描述:IC REG CTRLR BUCK PWM VM 32-QFN RoHS:否 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: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 |
| LTC3802EUH#TRPBF | 功能描述:IC REG CTRLR BUCK PWM VM 32-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: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 |
| LTC3803ES6 | 制造商:Linear Technology 功能描述:DC DC Cntrlr Single-OUT Flyback Controller 9.2V to 75V Input 6-Pin TSOT-23 |
发布紧急采购，3分钟左右您将得到回复。