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參數資料
| 型號： | NCP1423DMR2 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩壓器 |
| 英文描述： | 400 mA Sync−Rect PFM Step−Up DC−DC Converter with True−Cutoff and Ring−Killer |
| 中文描述： | 1.2 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | MICRO PACKAGE, 10 PIN |
| 文件頁數： | 12/13頁 |
| 文件大小： | 163K |
| 代理商： | NCP1423DMR2 |
NCP1423
http://onsemi.com
12
General Design Procedures
Switching mode converter design is important. Suitable
choice an inductor and capacitor value can make the
converter has an optimum performance. Below a simple
method base on the most basic first order equations to
estimate the inductor and capacitor values for NCP1423
operate in Continuous Conduction Mode (CCM) is
introduced. The component value set can be used as a
starting point to finetune the circuit operation. By all
means, detail bench testing is needed to get the best
performance out of the circuit.
Design Parameters:
For one cells supply application
V
IN
= 1.1 V to 1.5 V, Typical 1.3 V
V
OUT
= 3.3 V
I
OUT
= 150 mA (200 mA max)
V
LB
= 1.0 V
V
OUTRIPPLE
= 30 mV
pp
at I
OUT
= 150 mA
Calculate the feedback network:
Select R2 = 100 k
VOUT
VFB
R1
R2
1
R1
100 k
3.3 V
0.5 V
1
560 k
Calculate the Low Battery Detect divider:
V
LB0
= 1.0 V
Select R4 = 100 k
R3
R4
VLB0
VLB1
1
R3
100 k
1.0 V
0.5 V
1
100 k
Determine the steady state duty ratio, D for typical V
IN
,
operation will be optimized around this point:
VOUT
VIN
1
1
D
D
1
VIN
VOUT
1
1.3 V
3.3 V
0.606
Determine the average inductor current, I
LAVG
at
maximum I
OUT
:
IOUT
1
D
1
Assume the efficiency = 85%
Determine the peak inductor ripple current, I
RIPPLEP
and
calculate the inductor value:
Assume I
RIPPLEP
is 40% of I
LAVG
, the inductance of the
power inductor can be calculated as in below:
I
RIPPLEP
= 0.40 x 381 mA / = 179 mA
VIN
tON
2 IRIPPLE
P
A standard value of 5.6 H is selected for initial trial.
Determine the output voltage ripple, V
OUTRIPPLE
and
calculate the output capacitor value:
V
OUTRIPPLE
= 30 mV
PP
at I
OUT
= 150 mA
IOUT
VOUT
RIPPLE
where t
ON
= 1.4 S and ESR
COUT
= 0.1 ,
From above calculation, you need at least 14 F in order
to achieve the specified ripple level at conditions stated.
Practically, a one level larger capacitor will be used to
accommodate factors not taken into account in the
calculations. Therefore, a capacitor value of 22 F is
selected. The NCP1423 is internal compensated for most
applications. But in case additional compensation is
required, the capacitor C1 can be used as external
compensation adjustment to improve system dynamics.
ILAVG
150 mA
0.606
381 mA
L
1.3 V
2 (179 mA)
1.4 S
5.0 H
COUT
tON
IOUT
ESRCOUT
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| NCP1423DMR2G | 功能描述:直流/直流開關轉換器 800mA PFM Boost w/Ring Killer RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| NCP1423EVB | 功能描述:電源管理IC開發工具 ANA NCP1423 EVAL BOARD RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| NCP1442FR4 | 功能描述:IC REG MULTI CONFIG POWERFLEX7 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩壓器 - DC DC 開關穩壓器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數:1 輸出電壓:3.3V 輸入電壓:4.5 V ~ 24 V PWM 型:- 頻率 - 開關:- 電流 - 輸出:125mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 包裝:Digi-Reel® 供應商設備封裝:SOT-6 其它名稱:MAX1836EUT33#TG16DKR |
| NCP1442T | 功能描述:IC REG MULTI CONFIG ADJ TO220-7 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩壓器 - DC DC 開關穩壓器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數:1 輸出電壓:3.3V 輸入電壓:4.5 V ~ 24 V PWM 型:- 頻率 - 開關:- 電流 - 輸出:125mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 包裝:Digi-Reel® 供應商設備封裝:SOT-6 其它名稱:MAX1836EUT33#TG16DKR |
| NCP1442TG | 制造商:ON Semiconductor 功能描述:CONV DC-DC SGL-OUT NON-INV/INV/STEP UP/STEP DOWN 7PIN TO-220 - Rail/Tube |
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