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MC34844A
ELECTRICAL CHARACTERISTICS
STATIC AND DYNAMIC ELECTRICAL CHARACTERISTICS
Table 11. Static and Dynamic Electrical Characteristics (continued)
Characteristics noted under conditions V IN = 12 V, V OUT = 42 V, PWM = VDC1, M/~S = VDC1, PIN & NIN = VDC1,
-40 ° C ≤ T A ≤ 105 ° C, PGND = 0 V, unless otherwise noted.
Characteristic
Symbol
Min
Typ
Max
Unit
Line Regulation
(21) -
VIN=7.0 to 28 V
I OUT /V IN
-0.2
-
0.2
%/V
Load Regulation
(21) - VLED
= 8.0 to 65 V (all Channels)
I OUT /V LED
-0.2
-
0.2
%/V
Slope compensation voltage ramp - R SLOPE = 68 k Ω
Current Sense Amplifier Gain
Current Sense Resistor
OTA Transconductance
Transconductance Sink and Source Current Capability
V SLOPE
A CSA
R SENSE
G M
I SS
-
-
-
-
-
0.49
9.0
22
200
100
-
-
-
-
-
V/ μ s
m Ω
μ S
μ A
FAIL PIN
Off-state Leakage Current - V FAIL = 5.5 V
On-state Voltage Drop - I SINK = 4.0 mA
I FAIL_LEAK
V OL
-
-
-
-
50
0.4
μ A
V
LED CHANNELS
Sink Current
I SINK
mA
ICHx Register = 255, PIN&NIN = Disabled, T A =25 °C
RISET=3.48 k Ω, 0.1%
78.4
80
81.6
Regulated minimum voltage across drivers
Pulse Width > 400 ns
Current Matching Accuracy
V MIN
I MATCH
625
-2.0
700
-
775
2.0
mV
%
I SET Pin Voltage
V SET
V
RISET=3.48 k Ω, 0.1%
LED Current Amplitude Resolution
1.0 mA < I LED < 80 mA
ILED RES
2.007
-
2.048
1.5
2.069
-
%
Off-state Leakage Current, All channels - (V CH = 45 V)
I CH_LEAK
-
-
10
μ A
PIN INPUT
Voltage to Disable PIN mode
PIN Bias Current
V PIN_DIS
I PIN
2.2
-2.0
-
-
-
2.0
V
μ A
PIN = V SET
Analog Dimming Current
ICHx Register = 255, RISET=3.48 k Ω 0.1%
I DIM_PIN
PIN = V SET /2
PIN = V SET
36
76
40
80
44
84
mA
Notes
21. Guaranteed by design
34844A
Analog Integrated Circuit Device Data
38
Freescale Semiconductor
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