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参数资料
| 型号： | LM5046SQ |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 540 kHz SWITCHING FREQ-MAX, QCC28 |
| 封装： | 5 X 5 MM, LLP-28 |
| 文件页数： | 22/32页 |
| 文件大小： | 888K |
| 代理商： | LM5046SQ |
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FIGURE 25. Using a Low Side Gate Driver to Augment Gate Drive Strength
Printed Circuit Board Layout
The LM5046 current sense and PWM comparators are very
fast and respond to short duration noise pulses. The compo-
nents at the CS, COMP, SLOPE, RAMP, SS, SSSR, RES,
UVLO, OVP, RD1, RD2, and RT pins should be physically
close as possible to the IC, thereby minimizing noise pickup
on the PC board trace inductance. Eliminating or minimizing
via’s in these critical connections are essential. Layout con-
sideration is critical for the current sense filter. If a current
sense transformer is used, both leads of the transformer sec-
ondary should be routed to the sense filter components and
to the IC pins. The ground side of the transformer should be
connected via a dedicated PC board trace to the AGND pin,
rather than through the ground plane. If the current sense cir-
cuit employs a sense resistor in the drive transistor source,
low inductance resistors should be used. In this case, all the
noise sensitive, low-current ground trace should be connect-
ed in common near the IC, and then a single connection made
to the power ground (sense resistor ground point).
The gate drive outputs of the LM5046 should have short, di-
rect paths to the power MOSFETs in order to minimize in-
ductance in the PC board. The boot-strap capacitors required
for the high side gate drivers should be located very close to
the IC and connected directly to the BST and HS pins. The
VCC and REF capacitors should also be placed close to their
respective pins with short trace inductance. Low ESR and
ESL ceramic capacitors are recommended for the boot-strap,
VCC and the REF capacitors. The two ground pins (AGND,
PGND) must be connected together directly underneath the
IC with a short, direct connection, to avoid jitter due to relative
ground bounce.
Application Circuit Example
The following schematic shows an example of a 100W phase-
shifted full-bridge converter controlled by LM5046. The oper-
ating input voltage range is 36V to 75V, and the output voltage
is 3.3V. The output current capability is 30 Amps. The con-
verter is configured for current mode control with external
slope compensation. An auxiliary winding is used to raise the
VCC voltage to reduce the controller power dissipation.
29
www.national.com
LM5046
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM5046SQ/NOPB | 功能描述:电流型 PWM 控制器 Phase-Shifted Full- Bridge PWM Cntrlr RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| LM5046SQX | 制造商:TI 制造商全称:Texas Instruments 功能描述:LM5046 Phase-Shifted Full-Bridge PWM Controller with Integrated MOSFET Drivers |
| LM5046SQX/NOPB | 功能描述:IC PWM CTRLR FULL BRIDG 28LLP RoHS:是 类别:集成电路 (IC) >> PMIC - AC-DC 转换器，离线开关 系列:PowerWise® 标准包装:1 系列:FPS™ 输出隔离:隔离 频率范围:61kHz ~ 73kHz 输入电压:8 V ~ 26 V 输出电压:650V 功率（瓦特）:12W 工作温度:-40°C ~ 115°C 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-MDIP 包装:Digi-Reel® 其它名称:FSL206MRBNFSDKR |
| LM505 | 制造商:LM TECHNOLOGIES 功能描述:ADAPTER BLUETOOTH NANO EDR 40M USB 制造商:LM TECHNOLOGIES 功能描述:BLUETOOTH ADAPTER, USB, BCM2045, EDR 制造商:LM TECHNOLOGIES 功能描述:BLUETOOTH ADAPTER, USB, BCM2045, 40M, EDR; Data Rate:2.166Mbps; Operating Temperature Min:-20C; Operating Temperature Max:75C; Operating Frequency Range:2.402GHz to 2.48GHz; Operating Temperature Range:-20C to +75C ;RoHS Compliant: Yes |
| LM5050-1 | 制造商:TI 制造商全称:Texas Instruments 功能描述:High Side OR-ing FET Controller |
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