BD8166EFV Rohm, BD8166EFV Datasheet - Page 14

• Manufacturer Part Number: BD8166EFV
• Description: 12V Input Multi-channel System Power Supply IC
• Manufacturer: Rohm

●Gate Shading Setting Method
●I/O Equivalent Circuit Diagram
BD81666EFV
© 2009 ROHM Co., Ltd. All rights reserved.
www.rohm.com
2. SW2 3. SW2 38. SW1 39. SW1
7. COMP2 33. COMP1
13. SS3 30. SS4
16. Vo2GS
26. COM
The IG input signal allows the high-level and low-level control of the positive-side gate voltage. The slope of output can be
set by the external RC. The recommended resistance set value is 200 Ω to 5.1 k Ω and the recommended capacitor set
value is 0.001 µF to 0.1 µF. The aggravation of efficiency may be caused if settings outside this range are made.
Vo2GS
Determine ∆V by referring to the following value. The following calculation equation is used for ∆V.
∆V =
Vcc
Fig.38 Gate Shading Timing Chart
Vo2
Δ V
VR
Vo2GS
VREF29
20Ω
20Ω
tWL
Vcc
10kΩ
Vcc
PVcc
Vo2
tLH
(1 - exp (-
tWH
CR
tW
8. FB2 12. FB3 25. FB4 32. FB1
4. BOOT2 37. BOOT1
14. IG
18. C1L 19. C2L 24. C3
27. V- 28. V+
))
[V]
L
H
H
L
SW
Fig. 40
14/17
VREF29
1kΩ
Vcc
TIMING STANDARD VALUE
Vo2GS“H” to “L”
Voltage difference
Vo2GS“L” to “H”
Time
PARAMETER
IG “ L ” Time
IG “ H ” Time
Vo1
REG
IC
SYMBOL
tWH
tWL
tLH
∆V
Fig. 39
Shading
Control
Gate
MIN
6. SS2 9. SCP 34. SS1
11. FOULT
15. GSOUT
22. VGH
35. VREG
1
1
LIMIT
TYP
18
10
0.1
2
GSOUT
Vo2GS
Vo2
R
Vcc
Vo2
MAX
C
From positive-side charge
pump
—
—
10k
50Ω
Technical Note
2009.07 - Rev.B
PVcc
Gate driver
UNIT
μs
μs
μs
V
BOOT
CONDITION
tWL = 2 us
R = 500 *
V = 10 V*