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參數(shù)資料
| 型號： | PIP250M |
| 英文描述： | Integrated buck converter |
| 中文描述： | 集成的降壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 5/19頁 |
| 文件大?。?/td> | 334K |
| 代理商： | PIP250M |
Philips Semiconductors
PIP250M
Integrated buck converter
Product data
Rev. 02 — 21 February 2003
5 of 19
9397 750 10904
Koninklijke Philips Electronics N.V. 2003. All rights reserved.
7.2 Operation
7.2.1
Single supply operation
Operation of the PIP250M from a single 5 V conversion supply is shown in
Figure 3
.
The upper MOSFET gate driver stage is supplied from the CB pin. An external
bootstrap circuit, comprising D1 and the 100 nF capacitor generates a voltage on CB
of twice V
DDO
.
The control circuit supply, V
DDC
is protected from transients by a low pass filter
comprising a 10
resistor and a 1
μ
F capacitor. These components should be
placed close to the device pins.
7.2.2
Regulated output voltage
The reference voltage of the PIP250M is 0.8 V. The regulated output voltage is set
using a resistive divider as shown in
Figure 9
. The resistors should be placed as
close as possible to the FB pin. Both resistors should be less than 1 k
in order to
avoid noise coupling. The 68 nF capacitor across the upper resistor improves the
control loop stability by adding a small amount of phase margin.
7.2.3
Power on reset
The PIP250M control circuit powers up when the voltage on V
DDC
rises above the
start-up threshold voltage (typically 4.1 V). The control circuit stops operating when
the voltage on V
DDC
falls below the power-down threshold voltage (typically 3.6 V).
Once the voltage on V
DDC
is above the start-up threshold voltage, the PIP250M does
not produce pulses until the voltage on OCSET/ENABLE rises above the OCSET/
ENABLE start-up threshold voltage (typically 1.25 V).
7.2.4
Soft start
The soft start sequence prevents surge currents being drawn from the conversion
supply when the PIP250M is powered up into a high current load. The soft start
sequence is controlled by an internal digital counter. During the soft start sequence,
the reference voltage on the non inverting input of the error amplifier is increased
from zero up to the normal operating level of 0.8 V. The duration of the soft start
sequence is typically 2 ms.
Fig 3.
Single supply operation.
03ak42
10
1
μ
F
100
μ
F
100 nF
5 V
CB
VDDC
VDDO
VSSO
VSSC
VO
D1
PIP250M
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PIP250M,518 | 功能描述:IC REG BUCK SYNC ADJ 15A 68HVQFN RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標準包裝:20 系列:SIMPLE SWITCHER® 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:12V 輸入電壓:4 V ~ 60 V PWM 型:電壓模式 頻率 - 開關(guān):52kHz 電流 - 輸出:1A 同步整流器:無 工作溫度:-40°C ~ 125°C 安裝類型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 包裝:管件 供應(yīng)商設(shè)備封裝:16-DIP 其它名稱:*LM2575HVN-12LM2575HVN-12 |
| PIP26U | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Fibers can be free cut using fiber cutter |
| PIP30 | 制造商:Microsemi Corporation 功能描述:TVS SGL BI-DIR 42.5V 7.5KW 2PIN CASE 11 - Bulk 制造商:ProTek Devices 功能描述:Suppressor Assembly 30V 7.5KW |
| PIP3101-A,127 | 功能描述:MOSFET RAIL TOPFET2 RoHS:否 制造商:STMicroelectronics 晶體管極性:N-Channel 汲極/源極擊穿電壓:650 V 閘/源擊穿電壓:25 V 漏極連續(xù)電流:130 A 電阻汲極/源極 RDS（導(dǎo)通）:0.014 Ohms 配置:Single 最大工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:Max247 封裝:Tube |
| PIP3102-R | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:LOGIC LEVEL TOPFET |
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