- 您现在的位置：买卖IC网 > PDF目录44572 > LM5046SQ (NATIONAL SEMICONDUCTOR CORP) SWITCHING CONTROLLER, 540 kHz SWITCHING FREQ-MAX, QCC28 PDF资料下载
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： | 27/32页 |
| 文件大小： | 888K |
| 代理商： | LM5046SQ |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页当前第27页第28页第29页第30页第31页第32页
Pin Descriptions
TSSOP
Pin
LLP Pin
Name
Description
Application Information
1
25
UVLO
Line Under-Voltage Lockout
An external voltage divider from the power source sets the
shutdown and standby comparator levels. When UVLO reaches
the 0.4V threshold the VCC and REF regulators are enabled. At
the 1.25V threshold, the SS pin is released and the controller
enters the active mode. Hysteresis is set by an internal current
sink that pulls 20A from the external resistor divider.
2
26
OVP/OTP Over Voltage Protection
An external voltage divider from the input power supply sets the
shutdown level during an over-voltage condition. Alternatively, an
external NTC thermistor voltage divider can be used to set the
shutdown temperature. The threshold is 1.25V. Hysteresis is set
by an internal current that sources 20 A of current into the
external resistor divider.
3
27
RAMP
Input to PWM Comparator
Modulation ramp for the PWM comparator. This ramp can be a
signal representative of the primary current (current mode) or
proportional to the input voltage (feed-forward voltage mode).
This pin is reset to GND at the end of every cycle.
4
28
CS
Current Sense Input
If CS exceeds 750mV the PWM output pulse will be terminated,
entering cycle-by-cycle current limit. An internal switch holds CS
low for 40nS after either output switches high to blank leading
edge transients.
5
1
SLOPE
Slope Compensation Current
A ramping current source from 0 to 100A is provided for slope
compensation in current mode control. This pin can be connected
through an appropriate resistor to the CS pin to provide slope
compensation. If slope compensation is not required, SLOPE
must be tied to ground.
6
2
COMP
Input to the Pulse Width Modulator An external opto-coupler connected to the COMP pin sources
current into an internal NPN current mirror. The PWM duty cycle
is at maximum with zero input current, while 1mA reduces the
duty cycle to zero. The current mirror improves the frequency
response by reducing the AC voltage across the opto-coupler.
7
3
REF
Output of a 5V reference
Maximum output current is 15mA. Locally decouple with a 0.1F
capacitor.
8
4
RT/SYNC Oscillator Frequency Control and
Frequency Synchronization
The resistance connected between RT and AGND sets the
oscillator frequency. Synchronization is achieved by AC coupling
a pulse to the RT/SYNC pin that raises the voltage at least 1.5V
above the 2V nominal bias level.
9
5
AGND
Analog Ground
Connect directly to the Power Ground.
10
6
RD1
Passive to Active Delay
The resistance connected between RD1 and AGND sets the
delay from the falling edge of HO1/SR1 or LO1/SR2 and the rising
edge of LO1 or HO1 respectively.
11
7
RD2
Active to Passive Delay
The resistance connected between RD2 and AGND sets the
delay from the falling edge of LO2 or HO2 and the rising edge of
HO2 or LO2 respectively.
12
8
RES
Restart Timer
Whenever the CS pin exceeds the 750mV cycle-by-cycle current
limit threshold, 30A current is sourced into the RES capacitor for
the remainder of the PWM cycle. If the RES capacitor voltage
reaches 1.0V, the SS capacitor is discharged to disable the HO1,
HO2, LO1, LO2 and SR1, SR2 outputs. The SS pin is held low
until the voltage on the RES capacitor has been ramped between
2V and 4V eight times by 10A charge and 5A discharge
currents. After the delay sequence, the SS capacitor is released
to initiate a normal start-up sequence.
www.national.com
4
LM5046
相关PDF资料 |
PDF描述 |
|---|---|
| LM5046MHX | SWITCHING CONTROLLER, 540 kHz SWITCHING FREQ-MAX, PDSO28 |
| LM5067SDX-2 | 2-CHANNEL POWER SUPPLY SUPPORT CKT, DSO10 |
| LM5067SD-2 | 2-CHANNEL POWER SUPPLY SUPPORT CKT, DSO10 |
| LM555H | PULSE; RECTANGULAR, TIMER, MBCY8 |
| LM555H/883B | PULSE; RECTANGULAR, TIMER, MBCY8 |
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 |
发布紧急采购，3分钟左右您将得到回复。