Typical operating characteristics, Electrical characteristics (continued) – Rainbow Electronics MAX17127 User Manual
Page 5
_______________________________________________________________________________________ 5
MAX17127
Six-String WLED Driver with Integrated
Step-Up Converter
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1. V
IN
= 12V, C
COMP
= 0.51nF, C
COUT
= 4.7µF, R
COMP
= 82.5kΩ, R
ISET
= 180kΩ, R
FSLCT
= 100kΩ, L = 10µH,
T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
Note 1: Specifications are guaranteed by design, not production tested.
Typical Operating Characteristics
(Circuit of Figure 1. V
IN
= 12V, T
A
= +25NC, unless otherwise noted.)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
FB_ Minimum On-Time
400
700
ns
FAULT PROTECTION
OVP Threshold Voltage
Rising edge, typical hysteresis = 90mV
1.23
1.27
V
FB_ Overvoltage Threshold
7
9
V
FB_ Open Threshold Voltage
130
280
mV
FB_ Check LED Source Current
0.4
1.3
mA
FB_ Check LED Time
0.7
1.3
ms
Overcurrent Fault Timer
Latch-off timer
88
168
µs
PWM CONTROL
PWM Input On-Time
400
ns
PWM Input Frequency Range
0.1
25
kHz
BOOST CONVERTER EFFICIENCY vs. INPUT VOLTAGE (V
S
)
(V
OUT
= 32V, I
OUT
= 120mA, BRIGHTNESS = 100%)
MAX17127 toc01
INPUT VOLTAGE (V)
EFFICIENCY (%)
23
20
17
14
11
8
80
82
84
86
88
90
92
78
5
26
BOOST CONVERTER EFFICIENCY vs. BRIGHTNESS
(V
S
= 2V, V
OUT
= 32V, I
OUT
= 120mA AT 100%)
MAX17127 toc02
BRIGHTNESS (%)
EFFICIENCY (%)
80
60
40
20
60
70
80
90
50
0
100