- 您现在的位置：买卖IC网 > PDF目录69004 > LM25119PSQX (NATIONAL SEMICONDUCTOR CORP) DUAL SWITCHING CONTROLLER, QCC32 PDF资料下载
参数资料
| 型号： | LM25119PSQX |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, QCC32 |
| 封装： | 5 X 5 MM, LLP-32 |
| 文件页数： | 18/24页 |
| 文件大小： | 694K |
| 代理商： | LM25119PSQX |
Pin Descriptions
Pin
Name
Description
1
VCC1
Bias supply pin. Locally decouple to PGND1 using a low ESR/ESL capacitor located as close to
controller as possible.
2
LO1
Low side MOSFET gate drive output. Connect to the gate of the channel1 low-side synchronous
MOSFET through a short, low inductance path.
3
PGND1
Power ground return pin for low side MOSFET gate driver. Connect directly to the low side of the
channel1 current sense resistor.
4
CSG1
Kelvin ground connection to the external current sense resistor. Connect directly to the low side of
the channel1 current sense resistor.
5
CS1
Current sense amplifier input. Connect to the high side of the channel1 current sense resistor.
6
RAMP1
PWM ramp signal. An external resistor and capacitor connected between the SW1 pin, the RAMP1
pin and the AGND pin sets the channel1 PWM ramp slope. Proper selection of component values
produces a RAMP1 signal that emulates the current in the buck inductor.
7
SS1
An external capacitor and an internal 10A current source set the ramp rate of the channel1 error
amp reference. The SS1 pin is held low when VCC1 or VCC2 < 4V, UVLO < 1.25V or during thermal
shutdown.
8
VCCDIS
Optional input that disables the internal VCC regulators when external biasing is supplied. If VCCDIS
>1.25V, the internal VCC regulators are disabled. The externally supplied bias should be coupled to
the VCC pins through a diode. VCCDIS has a 500k
pull-down resistor to ground to enable the VCC
regulators when the pin is left floating. The pull-down resistor can be overridden by pulling VCCDIS
above 1.25V with a resistor divider connected to the external bias supply.
9
FB1
Feedback input and inverting input of the channel1 internal error amplifier. A resistor divider from the
channel1 output to this pin sets the output voltage level. The regulation threshold at the FB1 pin is
0.8V.
10
COMP1
Output of the channel1 internal error amplifier. The loop compensation network should be connected
between this pin and the FB1 pin.
11
EN2
If the EN2 pin is low, channel2 will be disabled. Channel1 and all other functions remain active. The
EN2 has a 50k
pull-up resistor to enable channel2 when the pin is left floating.
12
AGND
Analog ground. Return for the internal 0.8V voltage reference and analog circuits.
13
RT
The internal oscillator is set with a single resistor between RT and AGND. The recommended
maximum oscillator frequency is 1.5MHz which corresponds to a maximum switching frequency of
750kHz for either channel. The internal oscillator can be synchronized to an external clock by
coupling a positive pulse into RT through a small coupling capacitor.
14
RES
The restart timer pin for an external capacitor that configures the hiccup mode current limiting. A
capacitor on the RES pin determines the time the controller will remain off before automatically
restarting in hiccup mode. The two regulator channels operate independently. One channel may
operate in normal mode while the other is in hiccup mode overload protection. The hiccup mode
commences when either channel experiences 256 consecutive PWM cycles with cycle-by-cycle
current limiting. After this occurs, a 10A current source charges the RES pin capacitor to the 1.25V
threshold which restarts the overloaded channel.
15
COMP2
Output of the channel2 internal error amplifier. The loop compensation network should be connected
between this pin and the FB2 pin.
16
FB2
Feedback input and inverting input of the channel2 internal error amplifier. A resistor divider from the
channel2 output to this pin sets the output voltage level. The regulation threshold at the FB2 pin is
0.8V.
17
DEMB
Logic input that enables diode emulation when in the low state. In diode emulation mode, the low
side MOSFET is latched off for the remainder of the PWM cycle when the buck inductor current
reverses direction (current flow from output to ground). When DEMB is high, diode emulation is
disabled allowing current to flow in either direction through the low side MOSFET. A 50k
pull-down
resistor internal to the LM25119 holds DEMB pin low and enables diode emulation if the pin is left
floating.
18
SS2
An external capacitor and an internal 10A current source set the ramp rate of the channel2 error
amp reference. The SS2 pin is held low when VCC1 or VCC2 < 4V, UVLO < 1.25V or during thermal
shutdown.
3
www.national.com
LM25119
相关PDF资料 |
PDF描述 |
|---|---|
| LM25119PSQE | DUAL SWITCHING CONTROLLER, QCC32 |
| LM25119PSQ | DUAL SWITCHING CONTROLLER, QCC32 |
| LM2576TV-ADJ | 3 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSFM5 |
| LM2623ALDX/NOPB | 2.2 A SWITCHING REGULATOR, 2000 kHz SWITCHING FREQ-MAX, DSO14 |
| LM2651-1.8MWC | 2.6 A SWITCHING REGULATOR, 345 kHz SWITCHING FREQ-MAX, UUC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LM25119PSQX/NOPB | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| LM25119QPSQ/NOPB | 制造商:Texas Instruments 功能描述: 制造商:Texas Instruments 功能描述:IC REG CTRLR BUCK PWM CM 32-LLP 制造商:Texas Instruments 功能描述:LM25119QPSQ/NOPB |
| LM25119QPSQX/NOPB | 制造商:Texas Instruments 功能描述:IC REG CTRLR BUCK PWM CM 32-LLP 制造商:Texas Instruments 功能描述:Dual Synchronous Buck Controller |
| LM2512 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Mobile Pixel Link Level 0, 24-Bit RGB Display Interface Serializer with Dithering and Look Up Table Option |
| LM-2512 | 制造商:ROHM 制造商全称:Rohm 功能描述:16 x 32 matrix display |
发布紧急采购，3分钟左右您将得到回复。