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EL7630 데이터시트 PDF




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부품번호 EL7630 기능
기능 White LED Boost Regulator
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EL7630 데이터시트, 핀배열, 회로
®
Data Sheet
February 22, 2006
EL7630
FN7371.1
White LED Boost Regulator
The EL7630 represents a high efficiency, constant frequency
PWM regulator for use in white LED driving applications.
With efficiencies up to 86%, the EL7630 operates at 1.35MHz
switching frequency while operating from an input voltage of
between 2.7V and 5.5V. The maximum output voltage of 27V
enables the EL7630 to drive up to 6 LEDs in series. It is also
possible to use the EL7630 to drive LEDs in series/parallel
combination for applications requiring up to 15 LEDs.
Available in the 6 Ld SC-70 and the 5 Ld TSOT packages, the
EL7630 features the same pinout as competitive products
but offers higher efficiency, constant frequency operation. It
is specified for operation over the -40°C to +85°C ambient
temperature range.
Pinouts
EL7630
(6 LD SC-70)
TOP VIEW
www.DataSheet4U.com
LX 1
GND 2
FB 3
6 VIN
5 PGND
4 ENAB
EL7630
(5 LD TSOT)
TOP VIEW
LX 1
GND 2
FB 3
5 VIN
4 ENAB
Features
• Up to 6 LEDs in series
• 27V maximum output
• 2.7V to 5.5V input
• Up to 86% efficient
• 1.35MHz constant frequency
• Enable/PWM dimming control
• Pb-free plus anneal available (RoHS compliant)
Applications
• LED backlighting
• Cell phones
• PDAs
• Handheld devices
Ordering Information
PART NUMBER PART TAPE & PACKAGE PKG.
(See Note) MARKING REEL (Pb-free) DWG. #
EL7630ICZ-T7 BCA
7” 6 Ld SC-70 P6.049
(3K pcs)
EL7630ICZ-T7A BCA
7” 6 Ld SC-70 P6.049
(250 pcs)
EL7630IWTZ-T7 BAAC
7” 5 Ld TSOT MDP0049
(3K pcs)
EL7630IWTZ-T7A BAAC
7” 5 Ld TSOT MDP0049
(250 pcs)
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100%
matte tin plate termination finish, which are RoHS compliant and
compatible with both SnPb and Pb-free soldering operations. Intersil
Pb-free products are MSL classified at Pb-free peak reflow
temperatures that meet or exceed the Pb-free requirements of
IPC/JEDEC J STD-020.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2006. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.




EL7630 pdf, 반도체, 판매, 대치품
Typical Performance Curves
EL7630
Block Diagram
22
20
16
12
8
4
0
0 20 40 60 80 100
DUTY-CYCLE (D)
FIGURE 6. PWM DIMMING CURVE (400Hz)
Vin
1.2MHz Oscillator and Ramp
Generator
Enable
EL7630
LX
PWM
Comparator
PWM Logic
Controller
FET
Driver
Current
Sense
GM Amp
Compensation
GM
Amplifier
95mV
(shared with PGND
in TSOT5 package) GND
PGND
Bandgap
Reference
Generator
FB
FIGURE 7. EL7630 BLOCK DIAGRAM
Pin Functions
LX (Pin 1) - Switching Pin. Connect to inductor and diode.
GND (Pin 2) - Ground Pin. Connect to local ground.
FB (Pin 3) - Feedback Pin. Connect to the cathode of lowest
LED and the sense resistor.
ENAB (Pin 4) - Enable Pin. Connect to enable signal to
turn-on or off the device.
PGND (Pin 5, SC-70 Package) - Ground Pin. Connect to
Pin 2 and to local ground.
VIN (Pin5/Pin6 SC-70 Package) - Input Supply Pin.
Connect to the input supply voltage.
4 FN7371.1
February 22, 2006

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EL7630 전자부품, 판매, 대치품
EL7630
The efficiency bench test results are shown in Figure 11. 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).
90
22µH,VIN=4V
85
80 2LED
75 5LED
4LED
70
6LED
65
3LED
60
55
0
10 20
LED CURRENT (mA)
30
FIGURE 11. EFFICIENCY CURVE WITH 2, 3, 4, 5 AND 6 LEDs
LOAD
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 12.
D1
L1
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 (VIN-L1-LX-PGND, and VIN-
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
RSET 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.
VIN
2.7V~5.5V
C1
OFF/ON
VDD LX
EL7630
EENNAABB FFBB
GND
RSET
C2
LEDs
FIGURE 12. LEDs IN SERIES/PARALLEL WITH MIRROR
CURRENT BALANCE
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.
Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality
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
7 FN7371.1
February 22, 2006

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부품번호상세설명 및 기능제조사
EL7630

White LED Boost Regulator

Intersil Corporation
Intersil Corporation

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