EL1848IWTZT7A INTERSIL [Intersil Corporation], EL1848IWTZT7A Datasheet - Page 4

• Manufacturer Part Number: EL1848IWTZT7A
• Description: White LED Step-Up Regulator
• Manufacturer: INTERSIL [Intersil Corporation]

Block Diagram
Typical Performance Curves
All performance curves and waveforms are taken with C
series; unless otherwise specified.
1.05
1.04
1.03
1.02
1.01
FIGURE 1. SWITCHING FREQUENCY vs V
1
2.5
SIGNAL
3
PWM
2.6V TO
C
V
5.5V
3.5
COMP
4.7µF
0.1µF
CNTL
C
IN
4
V
IN
COMP
4
CNTL
(V)
4.5
GENERATOR
REFERENCE
617K
50K
5
IN
1
= 4.7µF, C
5.5
OSCILLATOR
START-UP
CONTROL
ERROR AMP
V
I-SENSE
BOOST
1MHz
IN
+
+
+
EL1848
2
+
= 1µF, C
-
OVER-VOLTAGE
PROTECTION
3
= 0.1µF, L = 33µF, V
SHUTDOWN
THERMAL
LOGIC
PWM
3.5
2.5
1.5
0.5
3
2
1
0
2.5
FIGURE 2. QUIESCENT CURRENT
V
WHITE LEDs DISCONNECTED
CNTL
V
LX
PGND
C
SGND
4.5
OUT
S
=0V, 0.1V
IN
I(LED)
= 3.3V, V
L
33µH
6.5
V
CNTL
IN
8.5
5Ω
(V)
= 1V, R
10.5
C
1µF
OUT
1
= 5Ω, 3 LEDs in a
12.5
14.5