Typical Performance Characteristics - Analog Devices LINEAR LTM 8005 Manual

TYPICAL PERFORMANCE CHARACTERISTICS

LED Current vs CTRL1
2.0
1.6
1.2
0.8
0.4
0
0 0.25 0.50 0.75
CTRL1 VOLTAGE (V)
V
REF
2.5
VREF vs Load Current
2.0
1.5
1.0
0.5
0
0
Demonstration Circuit DC2257A
Output Current Ripple 34V at 1.2A
LED, 12V
CURRENT RIPPLE
50mA/DIV
LED Current vs CTRL2
2.0
1.6
1.2
0.8
0.4
0
1 1.25 1.50 0 0.25
8005 G01
vs Load
45 90 135 180
LOAD CURRENT (µA)
8005 G04
IN
8005 G06
1µs/DIV
For more information
T = 25°C, unless otherwise noted.
A
0.50 0.75 1 1.25 1.50
CTRL2 VOLTAGE (V)
8005 G02
Switching Frequency
vs SS Voltage
350
R = 23.2k
T
280
210
140
70
0
0 0.3 0.6
V
SS
DC2257A Conducted EMI with and
without Spread Spectrum Enabled
100
SPREAD SPECTRUM DISABLED
SPREAD SPECTRUM ENABLED
80
C
RAMP
60
41
21
1
0.1 1.1 2.1
FREQUENCY (MHz)
www.analog.com
LTM8005
LED Current vs FB
(CTRL1 = CTRL2 = V
REF
2.0
1.5
1.0
0.5
0
0 0.3 0.6 0.9
V (V)
FB
0.9 1.2 1.5
(V)
8005 G05
= 22nF
3.0 4.0 5.0
8005 G07
)
1.2 1.5
8005 G03
Rev. B
5