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参数资料
| 型号： | LT3782IFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM CM 28-SSOP |
| 标准包装： | 2,000 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 533kHz |
| 占空比： | 94% |
| 电源电压： | 6 V ~ 40 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： | 28-SOIC（0.173"，4.40mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
LT3782
APPLICATIONS INFORMATION
With a 200ns one-shot timer on chip, the LT3782 provides
?exibility on the external sync pulse width. The sync pulse
threshold is about 1.2V (Figure 1).
Current Limit
Current limit is set by the 60mV threshold across SEN1P,
SEN1N for channel one and SEN2P, SEN2N for channel
two. By connecting an external resistor R S (see Block
Diagram), the current limit is set for 60mV/R S . R S should
be placed very close to the power switch with very short
traces. A low pass R C ?lter is needed across R S 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 Recti?er 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 LT3782
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 R SET 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 R SET to ground to
program V DELAY for the longer delay needed. For example,
for a switching frequency of 250kHz and delay of 150ns,
5V TO 20V
PULSE WIDTH > 200ns
5k
SYNC
VN2222
LT3782
3782 F01
Figure 1. Synchronizing with External Clock
BGATE1
SGATE1
DELAY
SET
3782 F02
Figure 2. Delay Timing
3782fg
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3791 | 制造商:LINER 制造商全称:Linear Technology 功能描述:60V 4-Switch Synchronous |
| LT3791-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:40VIN LED Converter with Internal PWM Generator Wide VIN Range: 4.5V to 40V |
| LT3791EFE#PBF | 功能描述:IC LED DRVR CONTROL 38TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:True Color PWM™ 标准包装:60 系列:- 恒定电流:- 恒定电压:- 拓扑:线性（LDO），PWM，升压（升压） 输出数:8 内部驱动器:是 类型 - 主要:背光 类型 - 次要:RGB，白色 LED 频率:500kHz ~ 1.5MHz 电源电压:4.75 V ~ 26 V 输出电压:45V 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* 工作温度:-40°C ~ 85°C |
| LT3791EFE#TRPBF | 功能描述:IC LED DRVR CONTROL 38TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:True Color PWM™ 标准包装:6,000 系列:- 恒定电流:- 恒定电压:- 拓扑:开路漏极，PWM 输出数:4 内部驱动器:是 类型 - 主要:LED 闪烁器 类型 - 次要:- 频率:400kHz 电源电压:2.3 V ~ 5.5 V 输出电压:- 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘 供应商设备封装:8-HVSON 包装:带卷 (TR) 工作温度:-40°C ~ 85°C 其它名称:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND |
| LT3791EFE-1#PBF | 制造商:Linear Technology 功能描述:LED DRVR 9V/12V/15V/18V/24V 38-Pin TSSOP EP 制造商:Linear Technology 功能描述:IC REG CTRLR BUCK BST 38TSSOP 制造商:Linear Technology 功能描述:BUCK/BOOST 4.7/60V 700KHZ 3 制造商:Linear Technology 功能描述:BUCK/BOOST, 4.7/60V, 700KHZ, 38TSSOP 制造商:Linear Technology 功能描述:PWM CONTROLLER, BUCK-BOOST, 700KHZ, 60V, TSSOP-38; Input Voltage:60V; Output Current:10A; Digital IC Case Style:TSSOP; No. of Pins:38; Frequency:700kHz; Operating Temperature Min:-40C; Operating Temperature Max:125C ;RoHS Compliant: Yes |
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