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EL7630ICZ-T7A Datasheet(PDF) 4 Page - Intersil Corporation

Part # EL7630ICZ-T7A
Description  White LED Boost Regulator
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

EL7630ICZ-T7A Datasheet(HTML) 4 Page - Intersil Corporation

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4
FN7371.0
June 28, 2005
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.
Detailed Description
EL7630 uses a constant frequency, current mode control
scheme to provide excellent line and load regulation. It
FIGURE 6. SWITCHING FREQUENCY vs TEMPERATURE
FIGURE 7. PWM DIMMING CURVE (400Hz)
Typical Performance Curves
1.2
1.22
1.24
1.26
1.28
1.3
1.32
1.34
-40
10
60
TEMPERATURE (°C)
0
4
8
12
16
20
0
20
40
60
80
100
DUTY-CYCLE (D)
22
FET
Driver
PWM Logic
Controller
Current
Sense
GM
Amplifier
1.2MHz Oscillator and Ramp
Generator
Bandgap
Reference
Generator
95mV
GM Amp
Compensation
PWM
Comparator
Vin
Enable
LX
PGND
FB
(shared with PGND
in TSOT5 package) GND
EL7630
FET
Driver
PWM Logic
Controller
Current
Sense
GM
Amplifier
1.2MHz Oscillator and Ramp
Generator
Bandgap
Reference
Generator
95mV
GM Amp
Compensation
PWM
Comparator
Vin
Enable
LX
PGND
FB
(shared with PGND
in TSOT5 package) GND
EL7630
FIGURE 8. EL7630 BLOCK DIAGRAM
EL7630


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