LTC7813 datasheet(24/59 Pages) AD

24 / 59 page

Data Sheet

LT8210-1

analog.com

Rev. A

24 of 59

Figure 41. GATEVCC Response to Input Brownout (EXTVCC = 12V)

Figure 42. GATEVCC Response to Input Brownout

(EXTVCC = 0V)

Figure 43. DG Pin Charging Current vs. Voltage

Figure 44. BST1, BST2 Average Charging Current for

Non-Switching Channel

Figure 45. DG, BST1, BST2 Charging in Pass-Thru (Figure 79)

Figure 46. Current Sharing, 12VIN, CCM

VIN FROM 12V TO 4V

VOUT = 12V

VGATEV

CC = 10.6V

VDD = 3.3V

200µs/DIV

VDD

2V/DIV

VIN

5V/DIV

GATEVCC

5V/DIV

VOUT

10V/DIV

GATEVCC UVLO

CGATEVCC = 68µF

4ms/DIV

VIN FROM 12V TO 4V

VGATEV

CC = 10.6V

VGATEV

CC < 3.7V

2V/DIV

VIN

5V/DIV

GATEVCC

5V/DIV

VOUT

10V/DIV

100

125

150

175

200

225

250

VIN = 4.5V

VIN = 8V

VIN = 12V

VIN = 48V

VDG – VIN (V)

IBST2

IBST1

VOUT = 12V

DCM (IOUT = 0.02A, fSW = 80kHz)

DCM (IOUT = 0.02A, fSW = 400kHz)

CCM

INPUT VOLTAGE (V)

100

10k

20ms/DIV

DG (AC)

2V/DIV

BST2 (AC)

2V/DIV

BST1 (AC)

2V/DIV

RAIL 1

RAIL 2

RAIL 3

RAIL 4

% ERROR

TOTAL LOAD CURRENT (A)

3.6

10.7 17.8 24.9 32.0 39.0 46.1 53.2 60.3 67.4 74.4

100

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