el7630 Intersil Corporation, el7630 Datasheet - Page 4

• Manufacturer Part Number: el7630
• Description: White Led Boost Regulator
• Manufacturer: Intersil Corporation

Typical Performance Curves
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
1.2MHz Oscillator and Ramp
1.2MHz Oscillator and Ramp
Comparator
Comparator
20
16
12
22
FIGURE 6. PWM DIMMING CURVE (400Hz)
8
4
0
PWM
PWM
in TSOT5 package) GND
in TSOT5 package) GND
FIGURE 7. EL7630 BLOCK DIAGRAM
(shared with PGND
(shared with PGND
0
GM Amp
GM Amp
Compensation
Compensation
Generator
Generator
Vin
Vin
20
PWM Logic
PWM Logic
EL7630
Controller
Controller
DUTY-CYCLE (D)
40
Amplifier
Amplifier
GM
GM
Enable
Enable
PGND (Pin 5, SC-70 Package) - Ground Pin. Connect to
Pin 2 and to local ground.
V
Connect to the input supply voltage.
60
IN
95mV
95mV
Current
Current
Sense
Sense
(Pin5/Pin6 SC-70 Package) - Input Supply Pin.
Driver
Driver
FET
FET
80
EL7630
EL7630
Reference
Reference
Generator
Generator
Bandgap
Bandgap
100
PGND
PGND
FB
FB
LX
LX
February 22, 2006
FN7371.1