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參數(shù)資料
| 型號(hào)： | EL7630ICZ |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | White LED Boost Regulator |
| 中文描述： | 0.35 A SWITCHING REGULATOR, 1900 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | ROHS COMPLIANT, SC-70, 6 PIN |
| 文件頁數(shù)： | 7/7頁 |
| 文件大?。?/td> | 223K |
| 代理商： | EL7630ICZ |
7
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Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
FN7371.0
June 28, 2005
The efficiency bench test results are shown in Figure 12. In
the test, the input voltage is 4V and 2, 3, 4, 5 and 6 LEDs are
used as the load (boost inductor L = 22μH Sumida
CDRH5D28R-220NC).
White LED Connections
One leg of LEDs connected in series will ensure brightness
uniformity. The 27V maximum output voltage specification
enables up to 6 LEDs to be placed in series.
In order to output more power to drive more LEDs, LEDs
should be in series/parallel connection. Due to the LED's
negative temperature coefficient, in each parallel branch, the
driving source should be high impedance, to balance the
LED current in each branch. One of the ways to ensure the
brightness uniformity is to add mirror current balance circuit,
built up with three transistors for the 15 LEDs series/parallel
connection application shown in Figure 13.
PCB Layout Considerations
The PCB layout is very important for the converter to
function properly. For the SC-70 6 pin package, Power
Ground and Signal Ground should be separated to ensure
the high pulse current in the power ground does not interfere
with the sensitive signals connected to Signal Ground. Both
grounds should only be connected at one point right at the
chip. The heavy current loops (V
IN
-L1-LX-PGND, and V
IN
-
L1-D1-C2-PGND) should be as short as possible. For the
TSOT 5 pin package, there is no separated GND. All return
GNDs should be connected in GND pin but with no sharing
branch. Based on the signal level on each branch, the lower
power level of the branch, the closer the branch to GND pin
in order to minimize the branch interactive.
The FB
pin is most important. The current sense resistor
R
SET
should be very close to this pin. If a long trace is
required to the LEDs, a small decoupling capacitor should be
placed at this pin.
The heat of the IC is mainly dissipated through the PGND
pin. Maximizing the copper area connected to this pin is
preferable. In addition, a solid ground plane is always helpful
for the EMI performance.
The demo board is a good example of layout based on the
principle. Please refer to the EL7630 Application Brief for the
layout.
FIGURE 12. EFFICIENCY CURVE WITH 2, 3, 4, 5 AND 6 LEDs
LOAD
55
60
65
70
75
80
85
90
0
10
20
30
LED CURRENT (mA)
22μH,V
IN
=4V
3LED
4LED
5LED
2LED
6LED
E
EL7630
C1
VDD
LX
ENAB
FB
GND
L1
D1
C2
R
SET
V
IN
2.7V~5.5V
OFF/ON
LEDs
FIGURE 13. LEDs IN SERIES/PARALLEL WITH MIRROR
CURRENT BALANCE
EL7630
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EL7630ICZ-T7 | 功能描述:LED顯示驅(qū)動(dòng)器 EL7630ICZ WHT LED BOOSTG RoHS:否 制造商:Micrel 數(shù)位數(shù)量:5 片段數(shù)量: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PLCC-44 工作電源電壓:4.75 V to 11 V 最大電源電流:10 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
| EL7630ICZ-T7A | 功能描述:LED顯示驅(qū)動(dòng)器 EL7630ICZ WHT LED BOOSTG RoHS:否 制造商:Micrel 數(shù)位數(shù)量:5 片段數(shù)量: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PLCC-44 工作電源電壓:4.75 V to 11 V 最大電源電流:10 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
| EL7630IWTZ | 制造商:Intersil Corporation 功能描述:LED DRVR 6SEGMENT 2.7V TO 5.5V 5PIN TSOT - Bulk |
| EL7630IWTZ-EVAL | 功能描述:LED 照明開發(fā)工具 EL7630IWTZ-EVAL DEMO BRD RoHS:否 制造商:Fairchild Semiconductor 產(chǎn)品:Evaluation Kits 用于:FL7732 核心: 電源電壓:120V 系列: 封裝: |
| EL7630IWTZ-T7 | 功能描述:LED顯示驅(qū)動(dòng)器 EL7630IWTZ WHT LED BOOSTG RoHS:否 制造商:Micrel 數(shù)位數(shù)量:5 片段數(shù)量: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PLCC-44 工作電源電壓:4.75 V to 11 V 最大電源電流:10 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
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