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参数资料
| 型号： | LM5046MHX |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 540 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封装： | TSSOP-28 |
| 文件页数： | 28/32页 |
| 文件大小： | 888K |
| 代理商： | LM5046MHX |
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TSSOP
Pin
LLP Pin
Name
Description
Application Information
13
9
SS
Soft-Start Input
An internal 20A current source charges the SS pin during start-
up. The input to the PWM comparator gradually rises as the SS
capacitor charges to steadily increase the PWM duty cycle.
Pulling the SS pin to a voltage below 200mV stops PWM pulses
at HO1,2 and LO1,2 and turns off the synchronous rectifier FETs
to a low state.
14
10
SSSR
Secondary Side Soft-Start
An external capacitor and an internal 20A current source set the
soft-start ramp for the synchronous rectifiers. The SSSR
capacitor charge-up is enabled after the first output pulse and
SS>2V and Icomp <800A
15
11
SSOFF
Soft-Stop Disable
When SS OFF pin is connected to the AGND, the LM5046 soft-
stops in the event of a VIN UVLO and Hiccup mode current limit
condition. If the SSOFF pin is connected to REF pin, the controller
hard-stops on any fault condition. Refer Table 1 for more details.
19
15
SR2
Synchronous Rectifier Driver
Control output for synchronous rectifier gate. Capable of peak
sourcing 100mA and sinking 400mA.
21
17
VCC
Output of Start-Up Regulator
The output voltage of the start-up regulator is initially regulated to
9.5V. Once the secondary side soft-start (SSSR pin) reaches 1V,
the VCC output is reduced to 7.7V. If an auxiliary winding raises
the voltage on this pin above the regulation set-point, the internal
start-up regulator will shutdown, thus reducing the IC power
dissipation.
22
18
PGND
Power Ground
Connect directly to Analog Ground
23, 20
19, 16
LO1, LO2 Low Side Output Driver
Alternating output of the PWM gate driver. Capable of 1.5A peak
source and 2A peak sink current.
24
20
SR1
Synchronous Rectifier Driver
Control output for synchronous rectifier gate. Capable of peak
sourcing 100mA and sinking 400mA.
25, 18
21, 14
BST1,2
Gate Drive Bootstrap
Bootstrap capacitors connected between BST1,2 and SW1,2
provide bias supply for the high side HO1,2 gate drivers. External
diodes are required between VCC and BST1,2 to charge the
bootstrap capacitors when SW1,2 are low.
26, 17
22, 13
HO1,2
High Side Output Driver
High side PWM outputs capable of driving the upper MOSFET of
the bridge with 1.5A peak source and 2A peak sink current.
27, 16
23, 12
HS1,2
Switch Node
Common connection of the high side FET source, low side FET
drain and transformer primary winding.
28
24
VIN
Input Power Source
Input to the Start-up Regulator. Operating input range is 14V to
100V. For power sources outside of this range, the LM5046 can
be biased directly at VCC by an external regulator.
5
www.national.com
LM5046
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM5046MHX/NOPB | 功能描述:电流型 PWM 控制器 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 |
| LM5046SQ | 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 |
| 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 |
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