LTC3703 datasheet(17/32 Pages) LINER

17 / 32 page

LTC3703

3703f

Figure 10a. VCC Generated from 10V < VOUT < 15V

APPLICATIO S I FOR ATIO

VCC

DRVCC

VIN

BGRTN

LTC3703

VOUT

10V TO

15V

COUT

3703 F10a

CIN

µF

VIN

12V

VCC

DRVCC

VIN

BGRTN

LTC3703

VOUT

<10V

COUT

3703 F10b

CIN

4.7

µF

6.3V

VIN

12V

C10

µF

16V

VIN

GND

SHDN

R17

110k

LT1613

ZHCS400

µH

Figure 10b. VCC Generated from VOUT < 10V

is above the input supply: VBOOST = VIN + VDRVCC. The

value of the boost capacitor CB needs to be 100 times that

of the total input capacitance of the top side MOSFET(s).

The reverse breakdown of the external diode, DB, must be

greater than VIN(MAX). Another important consideration

for the external diode is the reverse recovery and reverse

leakage, either of which may cause excessive reverse

current to flow at full reverse voltage. If the reverse

current times reverse voltage exceeds the maximum

VCC

DRVCC

FCB

GND

VIN

TG1

BG1

BGRTN

LTC3703

VOUT

VSEC

COUT

µF

3703 F10c

VIN

OPTIONAL VCC

CONNECTION

10V < VSEC < 15V

CIN

12V

VCC

DRVCC

VIN

BGRTN

LTC3703

VOUT

COUT

3703 F10d

CIN

VIN (<40V)

µF

12V

BAT85

VN2222LL

0.22

µF

Figure 10c. Secondary Output Loop and VCC Connection

Figure 10d. Capacitive Charge Pump for VCC (VIN < 40V)

allowable power dissipation, the diode may be damaged.

For best results, use an ultrafast recovery silicon diode

such as the BAS21.

An internal undervoltage lockout (UVLO) monitors the

voltage on DRVCC to ensure that the LTC3703 has suffi-

cient gate drive voltage. If the DRVCC voltage falls below

the UVLO threshold, the LTC3703 shuts down and the gate

drive outputs remain low.

LTC3703 датащи(PDF) 17 Page - Linear Technology

LTC3703 датащи(HTML) 17 Page - Linear Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

датащи скачать

ссылки URL