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參數(shù)資料
| 型號(hào)： | LT1611 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Isolated Flyback Switching Regulator with 9V Output |
| 中文描述： | SWITCHING REGULATOR, 1400 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 263K |
| 代理商： | LT1611 |
8
LT1611
In Figure 11 (also shown on the first page), output capaci-
tor C3 is replaced by a ceramic unit. These large value
ceramic capacitors have ESR of about 2m
and result in
very low output ripple. At the 20mV/division scale, output
voltage ripple cannot be seen. Figure 12 pictures the
output and switch nodes at 200ns per division. The output
voltage ripple is approximately 1mV
P–P
. Again, good
layout is mandatory to achieve this level of performance.
OPERATIOU
Layout
The LT1611 switches current at high speed, mandating
careful attention to layout for best performance.
You will
not get advertised performance with careless layout.
Figure13
shows recommended component placement. Follow this
closely in your printed circuit layout. The cut ground
copper at D1’s cathode is essential to obtain the low noise
achieved in Figures 11 and 12’s oscillographs. Input
bypass capacitor C1 should be placed close to the LT1611
as shown. The load should connect directly to output
capacitor C2 for best load regulation. You can tie the local
ground into the system ground plane at C3’s ground
terminal.
Figure 11. Replacing C3 with 22
μ
F Ceramic Capacitor
(Taiyo Yuden JMK325BJ226MM) Improves Output
Noise. C
PL
= 1200pF Results in Best Phase Margin
V
OUT
20mV/DIV
AC COUPLED
LOAD CURRENT 150mA
100
μ
s/DIV
1611 F11
Figure 12. 22
μ
F Ceramic Capacitor at
Output Reduces Ripple to 1mV
P–P
. Proper
Layout Is Essential to Achieve Low Noise
V
OUT
5mV/DIV
AC COUPLED
SWITCH VOLTAGE
5V/DIV
LOAD = 150mA
200ns/DIV
1611 F12
Figure 13. Suggested Component Placement. Note Cut in Ground Copper at D1’s Cathode
1
2
3
5
4
C2
D1
R2
R1
L1B
C1
L1A
+
+
SHUTDOWN
1611 F13
–V
OUT
GND
V
IN
C3
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT1611CS5 | Isolated Flyback Switching Regulator with 9V Output |
| LT1613 | 1.4MHz, Single Cell DC/DC Converter in 5-Lead SOT-23 |
| LT1613CS5 | 1.4MHz, Single Cell DC/DC Converter in 5-Lead SOT-23 |
| LT1620 | Controlled Current Battery Charging(控制電流的電池充電器) |
| LT1622 | Low Input Voltage Current Mode Step-Down DC/DC Controller(低輸入電壓，電流模式步降DC/DC控制器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT-1611-401-012-XSP1 | 制造商:Carling Technologies 功能描述:LT-SERIES TOGGLE SWITCH - Bulk |
| LT1611CS5 | 制造商:Linear Technology 功能描述:Conv DC-DC Single Inv 0.9V to 10V 5-Pin TSOT-23 |
| LT1611CS5#PBF | 制造商:Linear Technology 功能描述:Conv DC-DC Single Inv 0.9V to 10V 5-Pin TSOT-23 制造商:Linear Technology 功能描述:IC INVERTING REGULATOR 5-SOT-23 制造商:Linear Technology 功能描述:IC, INVERTING REGULATOR, 5-SOT-23 制造商:Linear Technology 功能描述:IC, INVERTING REGULATOR, 5-SOT-23; Primary Input Voltage:10V; No. of Outputs:1; Output Voltage:-5V; Output Current:150mA; No. of Pins:5; Operating Temperature Min:0C; Operating Temperature Max:70C; MSL:MSL 1 - Unlimited ;RoHS Compliant: Yes |
| LT1611CS5#TR | 功能描述:IC REG INV ADJ 0.3A SOT23-5 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(biāo)準(zhǔn)包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 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:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
| LT1611CS5#TRM | 功能描述:IC REG INV ADJ 0.3A SOT23-5 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(biāo)準(zhǔn)包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 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:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
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