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參數(shù)資料
| 型號： | LM5046SQ |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 540 kHz SWITCHING FREQ-MAX, QCC28 |
| 封裝： | 5 X 5 MM, LLP-28 |
| 文件頁數(shù)： | 28/32頁 |
| 文件大?。?/td> | 888K |
| 代理商： | LM5046SQ |
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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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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LM5046SQ/NOPB | 功能描述:電流型 PWM 控制器 Phase-Shifted Full- Bridge PWM Cntrlr RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| LM5046SQX | 制造商:TI 制造商全稱: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 類別:集成電路 (IC) >> PMIC - AC-DC 轉(zhuǎn)換器，離線開關 系列:PowerWise® 標準包裝:1 系列:FPS™ 輸出隔離:隔離 頻率范圍:61kHz ~ 73kHz 輸入電壓:8 V ~ 26 V 輸出電壓:650V 功率（瓦特）:12W 工作溫度:-40°C ~ 115°C 封裝/外殼:8-DIP（0.300"，7.62mm） 供應商設備封裝:8-MDIP 包裝:Digi-Reel® 其它名稱: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 制造商全稱:Texas Instruments 功能描述:High Side OR-ing FET Controller |
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