ISL97678IRZ Просмотр технического описания (PDF) - Intersil
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ISL97678IRZ Datasheet PDF : 18 Pages
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ISL97678
Electrical Specifications
All specifications below are characterized at TA = -40°C to +85°C; VIN = 12V, /SHUT = 5V,
ISET = 36kΩ, unless otherwise noted. Boldface limits apply over the operating
temperature range, -40°C to +85°C. (Continued)
PARAMETER
DESCRIPTION
CONDITION
MIN
MAX
(Note 7) TYP (Note 7) UNIT
VISET
ILEDmax
Voltage at ISET Pin
Maximum LED Current per Channel
PWM GENERATOR
LED config = 8P10S
with VF = 3.4V and
VIN = 11V
1.18 1.21 1.24
V
50
mA
FPWM
Dimming Range
VFSW
FPWMI
Generated PWM Frequency
PWM Dimming Duty Cycle Limits (Note 9)
fSW Voltage
PWMI Input Frequency Range (Note 9)
RFPWM = 330kΩ
RFPWM = 3.3kΩ
fPWM ≤ 30kHz
RFSW = 33kΩ
180
200
220
Hz
18
20
22
kHz
0.4
100
%
1.18 1.21 1.24
V
200
20k
Hz
VFPWM
VFPWM Voltage
RFPWM = 3.3kΩ
1.18 1.21 1.25
V
NOTES:
7. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established
by characterization and are not production tested.
8. At maximum VIN of 26V, minimum VOUT is 28V. Minimum VOUT can be lower at lower VIN
9. Limits established by characterization and are not production tested.
Typical Performance Curves
100
95
50mA
8P11S
fSW = 600kHz
0°C
90
85
-40°C
+85°C
+25°C
80
75
70
0
5
10
15
20
25
30
VIN (V)
FIGURE 3. EFFICIENCY vs VIN vs TEMPERATURE AT
50mA
100
95
20mA
8P11S
fSW = 600kHz
90 0°C
85
+85°C
-40°C
80
75
+25°C
70
0
5
10
15
20
25
30
VIN (V)
FIGURE 4. EFFICIENCY vs VIN vs TEMPERATURE AT
20mA
7
FN6998.1
November 5, 2009
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