ADP1047ARQZ-R7 datasheet(13/84 Pages) AD

13 / 84 page

Data Sheet

ADP1047/ADP1048

Rev. 0 | Page 13 of 84

OCP

ILIM

PGND

20µA TO

80µA

1500mV

VDD

ADP1047/ADP1048

OCP

ILIM

PGND

60µA TO

120µA

500mV

VDD

ADP1047/ADP1048

Figure 8. Fast Overcurrent Protection Schemes

LEVEL SHIFTING

10k × 120µA = 1.2V

LEVEL SHIFTING

10k × 80µA = 0.8V

500mV

0mV

1500mV

0mV

Figure 9. Level Shifting and Threshold for OCP

Table 5. Programmable Options for Fast Overcurrent Protection

Parameter

Values or Options

Comments

Debounce Time

40 ns, 80 ns, 120 ns, 240 ns

Blanking Time

40 ns, 80 ns, 120 ns, 160 ns, 200 ns, 400 ns, 600 ns, 800 ns

Blanking from the leading edge;

Propagation Delay

140 ns typical

Fixed value; does not include blanking or

debounce

Threshold Value and Polarity

500 mV (negative); 1500 mV (positive)

Fixed values

Level Shifting Current Sources

60 μA, 80 μA, 100 μA, 120 μA (negative)

20 μA, 40 μA, 60 μA, 80 μA (positive)

Actions for Fast OCP

Ignore (still terminates the PWM pulse); allow n switching

cycles, then shut down and soft start; allow n switching

cycles, then shut down and wait for PSON signal

n = 1, 2, 4, 8; Register 0xFE00, Bits[7:6]

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