L6910A(2003) データシートの表示（PDF） - STMicroelectronics
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L6910A Datasheet PDF : 21 Pages
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Figure 8. Asymptotic Bode plot of Converter's gain
dB
Error Amplifier
L6910A L6910
R5/R3
ωΖ1
ωP1
ω
ωLC
ωP2
ωΖ2
Modulator Gain
ωESR
Compensation Network Gain
Error Amplifier
Closed Loop Gain
20A Demo Board Description
The demo board shows the operation of the device in a general purpose application. This evaluation board al-
lows voltage adjustability from 0.9V to 5V through the switches S2-S5 according to the reported table when the
internal 0.9V reference is used (G1 closed). Output current in excess of 20A can be reached dependently on
the kind of mosfet used: up to three SO8 mosfet may be used for both High side and Low side switches. External
reference may be used for the regulation simply leaving open G1 and the switches S2-S5. The device may also
be disabled with the switch S1. The 12V input rail supplies the device while the power conversion starts from
the 5V input rail. The device is also able to operate with a single supply voltage; in this case the jumper G2 has
to be closed and a 5V to 12V input can be directly connected to the VIN input. The four layers demo board's
copper thickness is of 70µm in order to minimize conduction losses considering the high current that the circuit
is able to deliver. Figure 9 shows the demo board's schematic circuit
Figure 9. 20A Demo Board Schematic
VIN
GNDIN
VCC
GNDCC
Ref
IN
GNDRef
IN
F1
L1
G2
R7
C14
C16
C17
C21
R6
R1
D1
BOOT
12
VCC
15
OCSET
C13
3
UGATE
11
C15
GND
SS
OSC
EAREF
10
7
U1 14
4 L6910 13
2
9
8
1
5
6
PHASE
LGATE
PGND
PGOOD
VREF
C19 R5
S1
S2
R10
S3
R11
S4
R12
S5
R13
C18
G1
C1 -C3
Q1 -3
Q4 -6
L2
D2
C4 -11
C12
R3
R4
C20
Vout
0.9
1.2
1.5
1.8
2.5
3.3
5.0
S2 S3 S4 S5
Open Open Ope n Open
ON Open Open Open
Open ON Open Open
ON ON Open Open
Open Open ON Open
Open Open Open ON
Open Open ON ON
VOUT
R2
GNDOU T
PWRGD
+Vref
GNDref
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