S6AP111A28 datasheet(22/51 Pages) CYPRESS

22 / 51 page

Document Number: 002-08491 Rev.*C

Page 22 of 51

S6AP111A28

Figure 8-6. Output Block and Boost Circuit Block

8.13 Over Current Detection Block (ILIM Comp.)

This function limits the output current when it has increased, and protects devices connected to the output. It compares the

difference in voltage between the PGND1 pin (pin 22) and the LX1 pin (pin 24) and the ILIM1 pin (pin 21) voltage, and the difference

in voltage between the PGND2 pin (pin 15) and LX2 pin (pin 13) and the ILIM2 pin (pin 16) voltage during the synchronous

rectification period, and performs over current detection in every cycle.

The high side FET stays off until the difference in voltage between PGNDx and LXx is lower than the ILIMx pin voltage, and turns on

after it becomes lower. This is how over current protection is performed. This protection operation drops the output voltage.

For the difference in voltage between PGNDx and LXx during the synchronous rectification period, the low side FET on resistance is

sense resistance, and the inductor current is the sensed voltage waveform.

A 10

A (typical) I

ILIM current is supplied from the ILIMx pin, so you can set any over current limit value by connecting resistance to

the ILIMx pin. For the IILIM current, a temperature slope of 4200ppm/°C is set to compensate for the temperature dependence

characteristics of the low side FET on resistance.

8.14 Control Block (CTL)

Turn CH1 on or off using the CTL1 pin (pin 3) and turn the CH2 on or off using the CTL2 pin (pin 10). Setting both CTL1 and 2 to

Level "L" at the same time puts it in standby (the power supply current during standby is a maximum of 10

A).

Table 8-2. Control Functions

CTL1

CTL2

DC/DC Converter (CH1)

DC/DC Converter (CH2)

OFF

DRVLx

Drive

Logic

OUT

Bias

Reg.

Lo-side

Drive

Hi-side

Drive

DRVHx

CBx

LXx

DRVLx

Boost SW

x: Each channel number

S6AP111A28 Datasheet(PDF) 22 Page - Cypress Semiconductor

S6AP111A28 Datasheet(HTML) 22 Page - Cypress Semiconductor

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 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51

Datasheet Download

Link URL