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参数资料
| 型号： | LTC3810EG |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO28 |
| 封装： | 5.30 MM, PLASTIC, SSOP-28 |
| 文件页数： | 15/36页 |
| 文件大小： | 495K |
| 代理商： | LTC3810EG |
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LTC3810
22
3810fb
The external NMOS for the linear regulator should be a
standard 3V threshold type (i.e., not a logic level threshold).
The rate of charge of INTVCC from 0V to 10V is controlled
by the LTC3810 to be approximately 75μs regardless of
the size of the capacitor connected to the INTVCC pin. The
charging current for this capacitor is approximately:
IC =
10V
75
μs
CINTVCC
The safe operating area (SOA) for the external NMOS
should be chosen so that capacitor charging does not
damage the NMOS. Excessive values of capacitor are
unnecessary and should be avoided. Typically values in
the 1μF to 10μF work well.
One more design requirement for this mode is the minimum
soft-start capacitor value. The fault timeout is enabled
when SS/TRACK voltage is greater than 4V. This gives the
power supply time to bring the output up before it starts
the timeout sequence. To prevent timeout sequence from
starting prematurely during start-up, a minimum CSS value
is necessary to ensure that VSS/TRACK < 4V until VEXTVCC
> 6.7V. To ensure this, choose:
CSS > COUT (2.3 × 10–6)/IOUT(MAX)
Mode 2 should be used if VOUT is outside of the 6.7V <
EXTVCC < 15V operating range and the extra complexity
of a charge pump or extra inductor winding is not wanted
to boost this voltage above 6.7V. In this mode, EXTVCC is
grounded and the NMOS is chosen to handle the worst-
case power dissipation:
PMOSFET = VIN(MAX)
() f() Q
G(TOP) + QG(BOTTOM)
()+3mA
To operate properly, the fault timeout operation must be
disabled by choosing
RNDRV > (VIN(MAX) – 10V – VTH)/270μA
If the required RNDRV value results in an unacceptable
value for VIN(MIN) (see Equation 1), fault timeout operation
can also be disabled by connecting a 500k to 2M resistor
from the SS/TRACK pin to INTVCC.
Using Trickle Charge Mode
Trickle charge mode is selected by shorting NDRV and
INTVCC and connecting EXTVCC to VOUT. Trickle charge
mode has the advantage of not requiring an external
MOSFET but takes longer to start up due to slow charge
up of CINTVCC and CDRVCC through RPULLUP (tDELAY = 0.77
RPULLUP CDRVCC) and usually requires larger INTVCC/
DRVCC capacitor values to hold up the supply voltage dur-
ing start-up. Once the INTVCC/DRVCC voltage reaches the
trickle charge UV threshold of 12V, the drivers will turn on
and start discharging CINTVCC/CDRVCC at a rate determined
by the driver current IG. In order to ensure proper start-
up, CINTVCC/CDRVCC must be chosen large enough so that
the EXTVCC voltage reaches the switchover threshold of
6.7V before CINTVCC/CDRVCC discharges below the falling
UV threshold of 6V. This is ensured if:
CINTVCC + CDRVCC >IG
Larger of
COUT
IMAX
or
5.5 10
5 C
SS
VOUT(REG)
where IGisthegatedrivecurrent=(f)(QG(TOP)+QG(BOTTOM))
and IMAX is the maximum inductor current selected by
VRNG.
For RPULLUP, the value should fall in the following range
to ensure proper start-up:
Min RPULLUP > (VIN(MAX)–14V)/ICCSR
Max RPULLUP < (VIN(MIN)–12V)/IQ,SHUTDOWN
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