ISL97678IRZ Просмотр технического описания (PDF) - Renesas Electronics
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ISL97678IRZ Datasheet PDF : 17 Pages
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ISL97678
Electrical Specifications All specifications below are characterized at TA = -40°C to +85°C; VIN = 12V, EN = 5V, RSET = 36kΩ, unless
otherwise noted. Boldface limits apply over the operating temperature range, -40°C to +85°C. (Continued)
PARAMETER
DESCRIPTION
TEST CONDITIONS
MIN
MAX
(Note 7)
TYP
(Note 7) UNITS
ILEDmax
Maximum LED Current per Channel
PWM GENERATOR
LED config = 8P10S with
VF = 3.4V and VIN = 11V
50
mA
FPWM
Generated PWM Frequency
Dimming Range
FPWMI
PWM Dimming Duty Cycle Limits (Note 9)
PWMI Input Frequency Range (Note 9)
RFPWM = 330kΩ
RFPWM = 3.3kΩ
fPWM 30kHz
180
200
220
Hz
18
20
22
kHz
0.4
100
%
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.
10. Varies within range specified by VHEADROOM_RANGE.
Typical Performance Curves
100
50mA
8P11S
95 fSW = 600kHz
0°C
90
85
+85°C
-40°C
80
+25°C
100 20mA
8P11S
95 fSW = 600kHz
90 0°C
85
+85°C
80
-40°C
75
70
0
5
10
15
20
25
30
VIN (V)
FIGURE 4. EFFICIENCY vs VIN vs TEMPERATURE AT 50mA
75
+25°C
70 0
5
10
15
20
25
30
VIN (V)
FIGURE 5. EFFICIENCY vs VIN vs TEMPERATURE AT 20mA
100
95
8P10S
90
85
80
12V/50mA
75
70
65
60
24V/50mA
55
50
45
40
35
30
0
10
20
30
40
50
ILED (mA)
FIGURE 6. EFFICIENCY vs ILED
FN6998 Rev.3.00
Sep 8, 2017
95
94
93
92
91
90
89
88
87
86
85
84
400
50mA
8P11S
24V
12V
600
800 1k
1.2k 1.4k 1.6k
SWITCHING FREQUENCY (Hz)
FIGURE 7. EFFICIENCY vs SWITCHING FREQUENCY
Page 7 of 17
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