BD9540EFV Datasheet, PDF (3/18 Pages) Rohm – 2ch Switching Regulators for Desktop PC

BD9540EFV
Technical Note
●Block Diagram
VIN
VOUT1
VOUT1
4
Thermal TSD
Protection
EN1/UVLO
TSD/OVP
23 ^VIN
5VReg
22
5VReg
5VReg
VIN
BOOT1
1
28
HG1
EN1
FB1
5
5VReg
21
VCC
Soft
Start
SS1
H³Reg^TM
Controller
Block
REF1
SS1
-⁺⁺ _UVLO
ILIM1
SCP
TSD
RQ
S
SW1
1.02 +
FB1 ^-
OVP1
Driver
OCP ^Circuit
5VReg
27
SW1
LG1
26
OVP
25
PGND1
EN1
24
ILIM1
Logic Input
EN1 ³
EN2 ¹²
Reference ^REF2
Block
BG
UVLO
SCP
OVP
Delay
+ REF1×0.7
- _FB1
+ REF2×0.7
- _FB2
VOUT2
CTL1 ⁸
CTL2 ⁹
VOUT2
11
EN2
10
FB2
DAC
REF1
EN2/UVLO
TSD/OVP
Soft
Start
7
GND
SS2
REF2
SS2
-⁺⁺
UVLO
ILIM2
SCP
TSD
OVP2
EN2
0.90 +
FB2 -
5VReg
VIN
BOOT2
14
VIN
H³Reg^TM
Controller
Block
RQ
S
SW2
OCP
Driver
Circuit
5VReg
HG2
15
SW2
16
LG2
17
20
TEST
19
ILIM2
OVP
18
PGND2
VOUT1
VOUT2
●Pin Configuration
BOOT1 1
NC 2
EN1 3
VOUT1 4
FB1 5
NC 6
GND 7
CTL1 8
CTL2 ₉
FB2 10
VOUT2 ¹¹
EN2 12
NC 13
BOOT2 14
BD9540EFV
28 HG1
27 SW1
26 LG1
25 PGND1
24 ILIM1
23 V_IN
22 5VReg
21 VCC
20 TEST
19 ILIM2
18 PGND2
17 LG2
16 ^SW2
15 HG2
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3/17
2009.04 - Rev.B