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参数资料
| 型号： | PT5802C |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 18 A SWITCHING REGULATOR, 350 kHz SWITCHING FREQ-MAX, SMA18 |
| 封装： | SMD-18 |
| 文件页数： | 9/13页 |
| 文件大小： | 228K |
| 代理商： | PT5802C |
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
Startup of the PT5800 & PT5810 Series ISRs
with Back-Feeding Source (Pre-Bias Capability)
In complex digital systems an external voltage can
sometimes be present at the output of the regulator
during power up. For example, this voltage may be
backfed through a dual-supply logic component such as
an FPGA or ASIC. Another path might be via a clamp
diode (to a lower supply voltage) as part of a power-up
sequencing implementation.
Although the PT5800 (5-V input) and PT5810 (3.3-V
input) series of regulators will sink current under steady-
state operating conditions, they will not do so during
startup 1 as long as certain conditions are maintained 2.
This feature allows these regulators to start up while an
external voltage is simultaneously applied to the output.
Figure 2-1 is an application schematic that demonstrates
this capability. The waveforms in Figure 2-2 show the
behavior of the circuit as input power is applied. Note
that the plot of the regulator output current (Io) is approxi-
mately zero up to the timestamp ‘A’, even though a voltage
is initially backfed to the output via the 3.3-V input supply
and diodes D1 & D2. The regulator sources current 3 when
it begins raising the output above the back-fed voltage to
its nominal regulation value.
Notes
1. Startup includes both the application of a valid input
source voltage, or the removal of a ground signal from
the Inhibit* control (pin 2) with a valid input source
applied. The output of the regulator is effectively off
(tri-state), during the period that the Inhibit* control is
held low.
Vin (1V/Div)
Vo (1V/Div)
Io (5A/Div)
HORIZ SCALE 5ms/Div
A
Figure 2-2; Power-up Waveforms with Back-Feeding Source
Figure 2-1; Schematic Demonstrating Startup into Pre-Bias Capability
PT5812
14–17
9–13
5–7
V
IN
V
OUT
GND
C
out
+
C
IN
+
(3.3VDC)
COM
V
IN
V
O (2.5V)
8
18
Sense(+)
Sense(–)
D
2
I
o
D
1
2. To ensure that the regulator does not sink current, the
input voltage must always be greater or equal to the
output voltage throughout the power-up and power-down
sequence.
3. If an external source backfeeding the regulator’s output
is greater than the nominal regulation voltage, the output
will begin sinking current at the end of its soft-start
power-up sequence. If this current exceeds the rated
output, the module could be overstressed.
PT5800 & PT5810 Series
相关PDF资料 |
PDF描述 |
|---|---|
| PT5801N | 18 A SWITCHING REGULATOR, 350 kHz SWITCHING FREQ-MAX, SMA18 |
| PT5801A | 18 A SWITCHING REGULATOR, 350 kHz SWITCHING FREQ-MAX, SMA18 |
| PT5822A | 16 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, MSMA18 |
| PT5826A | 16 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, MSMA18 |
| PT5823C | 16 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, MSMA18 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| PT5802N | 功能描述:开关变换器、稳压器与控制器 2.5V 18-A 5-V Input Adj Step-Down ISR RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| PT5803 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:18-A 5-V Input Adjustable Integrated Switching Regulator |
| PT5803A | 功能描述:REG 1.8V 18A 4.5/5.5VIN HORZ RoHS:否 类别:电源 - 板载 >> DC DC Converters 系列:PT5800 设计资源:Maxi/Mini/Micro Design Guide, Appl Manual 标准包装:1 系列:Maxi 类型:隔离 输出数:1 电压 - 输入（最小）:43V 电压 - 输入（最大）:110V Voltage - Output 1:15V Voltage - Output 2:- Voltage - Output 3:- 电流 - 输出（最大）:* 电源（瓦） - 制造商系列:400W 电压 - 隔离:* 特点:* 安装类型:通孔 封装/外壳:模块 尺寸/尺寸:4.60" L x 2.20" W x 0.54" H（116.8mm x 55.9mm x 13.7mm） 包装:散装 工作温度:-55°C ~ 100°C 效率:* 电源（瓦特）- 最大:* |
| PT5803C | 功能描述:DC/DC转换器 1.8V 18-A 5-V Input Adj Step-Down ISR RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
| PT5803N | 功能描述:开关变换器、稳压器与控制器 1.8V 18-A 5-V Input Adj Step-Down ISR RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
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