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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
PWM GENERATOR
PWM Frequency Range (25)
fPWM S
110
-
27000
Hz
M/~S = Low (Slave Mode)
PWM Frequency
M/~S = High (Master Mode)
fPWM M
FPWM Register = 768
FPWM Register = 192,000
25000
103
27000
110
29000
112
Hz
PWM dimming resolution
t fPWM
-
0.39
-
%
PWM PIN (DIRECT PWM CONTROL)
Input PWM Pin Minimum Pulse (25)
Input PWM Frequency Range
t PWM_IN
fPWM
150
110
-
-
-
27000
ns
Hz
PHASE LOCK LOOP
CK Slave Mode Frequency Lock Range (24)
fCK S
110
-
27000
Hz
M/~S = Low (Slave Mode)
CK Slave Mode Input Jitter (25)
fCK S_JITTER
-
-
0.1
%
M/~S = Low (Slave Mode)
Slave Mode Acquisition Time
M/~S = Low (Slave Mode)
T S_ACQ
FPWM S =27 kHz
FPWM S =110 Hz
-
-
50
2000
-
-
ms
ms
CK Frequency (Master Mode)
fCK MASTER
FPWM Register = 768
FPWM Register = 192,000
25000
103
27000
110
29000
112
Hz
I 2 C/SM BUS PHYSICAL LAYER [SCK, SDA]
Interface Frequency Range
f SCK
400
kHz
SM Bus Power-on-Reset Time
SM Bus Shut down mode Timeout
t RST
t SHUTDOWN
-
-
100
30
-
-
ms
ms
Output fall
time (25)
t F
40
-
160
ns
10 ρ F < C L < 400 ρ F
Output rise time (25)
t R
20
-
80
ns
10 ρ F<C L <400 ρ F
LOGIC OUTPUT (CK)
Output Rise and Fall time
t R /t F
-
25
-
ns
C L <100 ρ F
LED CHANNELS
Channels Rise and Fall Time (25)
t R /t F
-
23
50
ns
Notes
24. Special considerations should be made for frequencies between 110 Hz to 1.0 KHz. Please refer to Functional Device Operation for
further details.
25. Guaranteed by design
34844A
Analog Integrated Circuit Device Data
Freescale Semiconductor
41
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