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参数资料
| 型号： | LT3782AIUFD |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, PQCC28 |
| 封装： | 4 X 5 MM, PLASTIC, MO-220, QFN-28 |
| 文件页数： | 20/20页 |
| 文件大小： | 233K |
| 代理商： | LT3782AIUFD |
LT3782A
9
3782af
With a 200ns one-shot timer on chip, the LT3782A provides
exibility on the external sync pulse width. The sync pulse
threshold is about 1.2V (Figure 1). This pin can be oated
when the sync function is not used.
Current Limit
Current limit is set by the 63mV threshold across SEN1P,
SEN1N for channel one and SEN2P, SEN2N for channel
two. By connecting an external resistor RS (see Block
Diagram), the current limit is set for 63mV/RS. RS should
be placed very close to the power switch with very short
traces. A low pass RC lter is needed across RS to lter out
the switching spikes. Good Kelvin sensing is required for
accurate current limit. The input bypass capacitor ground
should be at the same ground point of the current sense
resistor to minimize the ground current path.
Synchronous Rectier Switches
For high output voltage applications, the power loss of the
catch diodes are relatively small because of high duty cycle.
If diodes power loss or heat is a concern, the LT3782A
provides PWM signals through SGATE1 and SGATE2 pins
to drive external MOSFET drivers for synchronous recti-
er operation. Note that SGATE drives the top switch and
BGATE drives the bottom switch. To avoid cross conduction
between top and bottom switches, the BGATE turn-on is
delayed 100ns (when DELAY pin is tied to RSET pin) from
SGATE turn-off (see Figure 2). If a longer delay is needed
to compensate for the propagation delay of external gate
driver, a resistor divider can be used from RSET to ground to
program VDELAY for the longer delay needed. For example,
for a switching frequency of 250kHz and delay of 150ns,
Figure 1. Synchronizing with External Clock
Figure 2. Delay Timing
5V TO 20V
VN2222
PULSE WIDTH > 200ns
5k
SYNC
3782A F01
LT3782A
3782A F02
DELAY
BGATE1
SGATE1
SET
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3782AIUFD#PBF | 功能描述:IC REG CTRLR BST PWM CM 28-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 |
| LT3782AIUFD#TRPBF | 功能描述:IC REG CTRLR BST PWM CM 28-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 |
| LT3782AIUFD-PB | 制造商:LINER 制造商全称:Linear Technology 功能描述:2-Phase Step-Up DC/DC Controller |
| LT3782AIUFD-TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:2-Phase Step-Up DC/DC Controller |
| LT3782EFE | 制造商:Linear Technology 功能描述:DC DC Cntrlr Single-OUT Synchronous Step Up Controller 6V to 40V Input 28-Pin TSSOP EP |
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