L6910 データシートの表示（PDF） - STMicroelectronics
部品番号
コンポーネント説明
メーカー
L6910 Datasheet PDF : 29 Pages
| |||
Figure 11. Asymptotic Bode Plot of Converter's Gain
dB
Error Amplifier
L6910 - L6910A
R5/R3
ωΖ1
ωP1
ω
ωLC
ωP2
ωΖ2
Modulator Gain
ωESR
Compensation Network Gain
Error Amplifier
Closed Loop Gain
5 15A 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 VCC input rail supplies the device while the power conversion starts from
the VIN 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.The PGOOD signal is used as a logic level and it's been pulled up to VIN because there's no
other appropriate voltage available on the demo board. In case of input voltage higher than 7V (PGOOD Pin
Maximum Absolute Rating) a 5V reference is required. Figure 12 shows the demo board's schematic circuit
Figure 12. 15A Demo Board Schematic
VIN
GNDIN
F1
G2
L1
R7
C14
C13
VCC
GNDCC
REFIN
GNDREFIN
+VREF
GNDREF
R6
C17
C16 G1
D1
VCC
C15
GND
EAREF
BOOT
15
12
7
8
OCSET
3
VREF
1
C12
UGATE
11
PHASE
10
LGATE
14
PGND
13
PGOOD
9
Q1-3
Q4-6
SS
4
C21
OSC
2
R1
5
6
COMP
VFB
C19
R5
R3
C20
S1
C18
R4
S2
R10
S3
R11
S4
SR12
S5
SR13
D03IN1513
C1-C3
L2
C4-
D2
11
R8
R9
VOUT
R2
GNDOUT
PWRGD
C22
VOUT S2 S3 S4 S5
0.9 Open Open Open Open
1.2 ON Open Open Open
1.5 Open ON Open Open
1.8 ON ON Open Open
2.5 Open Open ON Open
3.3 Open Open Open ON
5.0 Open Open ON ON
11/29
Share Link: 