BD6062GU_11 ROHM [Rohm], BD6062GU_11 Datasheet - Page 11

• Manufacturer Part Number: BD6062GU_11
• Description: Chopper type for Flash
• Manufacturer: ROHM [Rohm]

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BD6062GU
7) Soft start
BD6062GU has soft start function.
Soft start function will prevent the big peak current from IC and coil.
The detail of soft start is as follows.
8) Soft Current Limiter
BD6062GU has Soft Current Limiter function.
Soft current limiter function will change the value of current gradually.
It has four steps. And the steps are as follows;
Peak current of BD6062GU depends on only soft current limiter.
Switching frequency or VBAT voltage does not affect Peak current of BD6062GU.
9) Thermal shut down
BD6062GU has a thermal shut down function.
It works above 175℃, and while, IC will change the status from active to inactive.
When the temperature will be under 175℃, IC will return to normal operation.
4Step of soft current limiter
Current Limit “H (peak)
Current Limit “L (peak)
Current Limit
Action
Time
ERRAMP
(DC)
EN
VOUT
A
B (dashed)
C
0A* always
0~500us
1.125A
0.675A
Start
B
A
Fig.32 Soft start Diagram and Timing
duty width increase little by little
500~700us
2nd step
1.75A
1.05A
0.5A
OSC
11/15
R
S
Q
Q
Q
700~800us
3rd step
C
2.375A
1.425A
1A
PGND
SW
L
800~900us
4th step
1.5A
3.0A
1.8A
VOUT
Normal
900us~
3.625A
2.175A
2A
Technical Note
2011.05 - Rev.B