EL7630
Typical Performance Curves
22
20
16
12
8
4
0
0
20
40
60
80
100
DUTY-CYCLE (D)
FIGURE 6. PWM DIMMING CURVE (400Hz)
Block Diagram
Vin
1.2MHz Oscillator and Ramp
Enable
EL7630
Generator
LX
PWM
Comparator
PWM Logic
Controller
FET
Driver
Current
Sense
PGND
GM Amp
Compensation
GM
Amplifier
95mV
Bandgap
Reference
FB
(shared with PGND
in TSOT5 package) GND
Generator
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.
4
PGND (Pin 5, SC-70 Package) - Ground Pin. Connect to
Pin 2 and to local ground.
V IN (Pin5/Pin6 SC-70 Package) - Input Supply Pin.
Connect to the input supply voltage.
FN7371.1
February 22, 2006
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