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BD6142AMUV
Datasheet
● How to activate
Please be careful about the following when being activated.
- Regulator (VDC) operates after ENABLE=H. Inside circuit operates after releasing UVLO. When IC boosts after
releasing UVLO, soft start function operates. (Refer to Figure 15, 9P). Soft start circuit needs t 15 (more than 15μs) as
Figure 25. shows. Soft start operates for t soft time. Please make H width of PWM more than 15μs until soft start finishes.
- Please input PWM signal according to Figure 26. after soft start finishes.
VIN
ENABLE
VDC
UVLO
PWM
t １５
t soft
t soft
t soft
SOFT START
Over current value increases..
Figure 25. Soft start
Example) Time until soft start finishes at PWM frequency 25kHz and PWM=H time16μs
According to soft start time typ4.3ms
t soft = 16μs – 15μs = 1μs
Soft start time/ t soft /PWM frequency = 4300μs / 1μs /25kHz = 4300 / 25kHz = 172ms
At light dimming of PWM terminal (after soft start finishes)
t1
VIN
L[V]
H[V]
t2 t3
t4 t5 t3
H[V]
ENABLE
t6
VDC
t14
t7
t8
t9
t14
PWM
t10
t11
Figure 26. Input timing (after soft start)
Name
Unit
Min.
Typ.
Max.
t1
t2
t3
t4
t5
t6
t7
t8
t9
t10
t11
t12
t13
t14
t15
H
L
Power supply rising time
Power supply-ENABLE time
ENABLE rising time
ENABLE falling time
ENABLE low width
Power supply-PWM time
PWM rising time
PWM high width
PWM falling time
PWM low width
PWM frequency
ENABLE (H)->PWM (H) time
ENABLE (L)->PWM (L) time
PWM (L)->ENABLE (L) time
PWM high width (while soft start)
Operating voltage
Non operating voltage
μs
μs
μs
μs
μs
μs
μs
μs
μs
μs
μs
μs
μs
μs
μs
V
V
100
0
0
0
50
0
0
5
0
5
40
0
0
0
15
4.2
-
-
-
-
-
-
-
-
-
-
-
5000
-
-
-
-
12
-
-
-
100
100
-
-
100
-
100
-
10000
-
-
-
-
27
4.2
www.rohm.com
? 2011 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
15/30
TSZ02201-0G3G0C400340-1-2
03.Dec.2012 Rev.001
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