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ELECTRICAL CHARACTERISTICS
STATIC AND DYNAMIC ELECTRICAL CHARACTERISTICS
Table 3. Static and Dynamic Electrical Characteristics (continued)
Characteristics noted under conditions V IN = 12 V, V OUT = 35 V, I LED = 30 mA, f S = 600 kHz, f PWM = 600 Hz - 40 ° C ≤ T A ≤
85 ° C, unless otherwise noted. Typical values noted reflect the approximate parameter means at T A = 25°C under nominal
conditions, unless otherwise noted.
Characteristic
Symbol
Min
Typ
Max
Unit
BOOST (CONTINUED)
Line Regulation
I LED /V IN
%/V
V IN = 7.0 V to 21 V, I CH = 30 mA
Load Regulation
V LED = 24 V to 40 V (all Channels), I CH = 30 mA
I LED /V LED
-0.2
-0.2
-
-
0.2
0.2
%/V
Minimum Duty Cycle
Maximum Duty Cycle
D MIN
D MAX
-
88
10
90
15
-
%
%
OVP Internally Fixed Value
V OVP_INT
V
(no external voltage resistor divider)
OVP Programming Range (9)
(set through an external resistor divider)
V OVP_EXT
56
15
60
-
64
60
V
OVP Reference Voltage
OVP Sink Current
V REF_OVP
I SINK_OVP
6.3
-
6.9
0.2
7.5
-
V
μ A
Switching Frequency
f S
kHz
34845, 34845C
34845A
34845B, 34845D
540
1080
270
600
1200
300
660
1320
330
Soft Start Time (Fs=600 kHz, 100% PWM duty)
Soft Start VOUT Overshoot (Fs=600 kHz, 100% PWM duty)
Boost Switch Rise Time
Boost Switch Fall Time
Current sense Amplifier Gain
OTA Transconductance
Transconductance Sink and Source Current Capability
t SS
SS_ VOUT
BOOST_t R
BOOST_t F
A CSA
G M
I SS
-
-
-
-
-
-
-
3.0
-
8.0
6.0
9.0
200
100
-
OVP
-
-
-
-
-
ms
V
ns
ns
μ S
μ A
Slope Compensation
V SLOPE
V/ μ s
34845, 34845C
34845A
34945B, 34845D
-
-
-
0.52
0.73
0.22
-
-
-
LED DRIVER
LED Driver Sink Current
I LED
mA
R ISET = 51 k Ω 0.1%, PWM = 3.3 V
R ISET = 5.1 k Ω 0.1%, PWM = 3.3 V
ISET Pin Voltage
R ISET = 5.1 k Ω 0.1%
Regulated Minimum Voltage Across LED Drivers
Pulse Width > 400ns
LED Current Channel to Channel Tolerance
10 mA ≤ I LED ≤ 30 mA
3.0 mA ≤ I LED < 10 mA
V ISET
V MIN
I TOLERANCE
2.88
29.4
2.011
0.675
-2.0
-4.0
3.0
30
2.043
0.75
-
-
3.12
30.6
2.074
0.825
2.0
4.0
V
V
%
34845
Analog Integrated Circuit Device Data
6
Freescale Semiconductor
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