MFS5600AMBAFES datasheet(19/118 Pages) NXP

19 / 118 page

NXP Semiconductors

FS5600

Automotive buck regulator and controller with voltage monitors and watchdog timer

OTP_SW1_VOLT[7:0]

Vout Setting (V)

11100xxx

5.8 V - 6.15 V with external resistor divider

11101xxx

6.2 V - 6.55 V with external resistor divider

11110xxx

6.6 V - 6.95 V with external resistor divider

11111xxx

7 V - 8 V with external resistor divider

Table 10. OTP_SW1_VOLT[7:0] selection...continued

11.3.2 PFM and pulse skipping operation

At a high VIN/VOUT ratio with high switching frequency, the controller may start to skip pulses to maintain

regulation. The minimum on-time of the high side FET is programmable via the OTP_SW1_MIN_TON[1:0] bits.

OTP_SW1_MIN_TON[1:0] = 0b01 is the recommended default value that is optimal for most applications.

OTP_SW1_MIN_TON[1:0]

SW1 minimum on-time (ns)

60 (recommended)

100

Table 11. OTP_SW1_MIN_TON[1:0] selection

In addition, the controller starts to switch at half of the selected frequency when the VIN/VOUT ratio is above 6.

This allows reduced ripple operation compared to pulse-skipping.

11.3.3 PFM operation

When the OTP_MODE_SYNCINB bit = 0, the MODE/SYNCIN pin is configured as a SYNCIN input. In

this case, the switching mode of SW1 can be selected using the SW1_MODE[1:0] bits. Default value of

SW1_MODE[1:0] is loaded from OTP_SW1_MODE[1:0].

OTP_SW1_MODE[1:0]

SW1_MODE[1:0]

SW1 operating mode

PFM

Reserved. Do not use.

PWM

Table 12. SW1_MODE[1:0] selection.

When the OTP_MODE_SYNCINB bit = 1, the MODE/SYNCIN pin is configured as a MODE input that can be

used to select the operating mode of SW1 between PWM (MODE = 0) and PFM (MODE = 1). To avoid conflicts

between the pin and register bits, do not use SW1_MODE[1:0] to change the operating mode.

On-time of the pulses in PFM mode is configurable using the OTP_SW1_PFM_TON[1:0] bits.

OTP_SW1_PFM_TON[1:0] = 0b10 offers a good compromise between quiescent current and the output ripple

for most applications.

OTP_SW1_PFM_TON[1:0]

SW1 PFM on-time (ns)

160

Table 13. OTP_SW1_PFM_TON[1:0] selection

FS5600

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 4 — 29 April 2024

19 / 118

MFS5600AMBAFES датащи(PDF) 19 Page - NXP Semiconductors

MFS5600AMBAFES датащи(HTML) 19 Page - NXP Semiconductors

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 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL