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参数资料
| 型号： | L6918DTR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封装： | SO-28 |
| 文件页数： | 22/35页 |
| 文件大小： | 431K |
| 代理商： | L6918DTR |
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L6918 L6918A
Figure 20. Power supply configuration
Two main configurations can be distinguished: Single Supply (VCC =VIN = 12V) and Double Supply (VCC = 12V
VIN = 5V or different).
– Single Supply: In this case JP6 has to be completely shorted. The device is supplied with the same rail
that is used for the conversion. With an additional zener diode DZ1 a lower voltage can be derived to
supply the mosfets driver if Logic level mosfet are used. In this case JP1 must be left open so that the
HS driver is supplied with VIN-VDZ1 through BOOTx and JP2 must be shorted to the left to use VIN or to
the right to use VIN-VDZ1 to supply the LS driver through VCCDR pin. Otherwise, JP1 must be shorted
and JP2 can be freely shorted in one of the two positions.
– Double Supply: In this case VCC supply directly the controller (12V) while VIN supplies the HS drains
for the power conversion. This last one can start indifferently from the 5V bus (Typ.) or from other buses
allowing maximum flexibility in the power conversion. Supply for the mosfet driver can be programmed
through the jumpers JP1, JP2 and JP6 as previously illustrated. JP6 selects now V
CC or VIN depending
on the requirements.
Some examples are reported in the following Figures 21 and 22.
Figure 21. Jumpers configuration: Double Supply
Vin
GNDin
DZ1
JP2
JP1
Vcc
GNDcc
JP6
To Vcc pin
To HS Drains (Power Input)
To BOOTx (HS Driver Supp ly)
To VCCDR pin (LS Driver Supply)
Vin = 5V
GNDin
DZ1
JP2
JP1
Vcc = 12V
GNDcc
JP6
Vcc = 12V
HS Drains = 5V
HS Supply = 5V
VCCDR (LS Supply) = 5V
Vin = 5V
GNDin
DZ1
JP2
JP1
Vcc = 12V
GNDcc
JP6
Vcc = 12V
HS Drains = 5V
HS Supply = 12V
VCCDR (LS Supply) = 12V
(a) VCC = 12V; VBOOTx = VCCDR = VIN =5V
(b) VCC =VBOOTx = VCCDR = 12V; VIN =5V
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