BQ25713 datasheet(31/111 Pages) TI2

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Table 8-5. Compensation Configuration

COMPONENT

VALUE

INDUCTOR

COMP1 R1

COMP1 C11

COMP1 C12

COMP2 R2

COMP2 C21

COMP2 C22

400 kHz

4.7 μH

40.2 kΩ

4.7 nF

33 pF

15 kΩ

680 pF

15 pF

800 kHz

3.3 μH

16.9 kΩ

3.3 nF

33 pF

15 kΩ

1200 pF

15 pF

800 kHz

2.2 μH

16.9 kΩ

3.3 nF

33 pF

10 kΩ

1200 pF

15 pF

COMP2

COMP1

C12

C11

C21

C22

Figure 8-2. Compensation RC Network

8.3.13 Continuous Conduction Mode (CCM)

With sufficient charge or system current, the inductor current does not cross 0 A, which is defined as CCM. The

controller starts a new cycle with ramp coming up from 200 mV. As long as the error amplifier output voltage

is above the ramp voltage, the high-side MOSFET (HSFET) stays on. When the ramp voltage exceeds error

amplifier output voltage, HSFET turns off and low-side MOSFET (LSFET) turns on. At the end of the cycle,

ramp gets reset and LSFET turns off, ready for the next cycle. There is always break-before-make logic during

transition to prevent cross-conduction and shoot-through. During the dead time when both MOSFETs are off, the

body-diode of the low-side power MOSFET conducts the inductor current.

During CCM, the inductor current always flows. Having the LSFET turn-on when the HSFET is off keeps the

power dissipation low and allows safe charging at high currents.

8.3.14 Pulse Frequency Modulation (PFM)

In order to improve converter light-load efficiency, BQ25730 switches to PFM operation at light load. The

effective switching frequency will decrease accordingly when system load decreases. The minimum frequency

can be limited to 25 kHz when the OOA feature is enabled (EN_OOA=1b) to avoid audible noise.

8.3.15 Switching Frequency and Dithering Feature

Normally, the IC switches in fixed frequency which can be adjusted through PWM_FREQ register bit. The

Charger also support frequency dithering function to improve EMI performance. This function is disabled by

default with setting EN_DITHER=00b. It can be enabled by setting EN_DITHER=01/10/11b, the switching

frequency is not fixed when dithering is enabled. It varies within determined range by EN_DITHER setting,

01/10/11b is corresponding to ±2%/4%/6% switching frequency. Please contact factory for more detail

information.

8.3.16 Current and Power Monitor

8.3.16.1 High-Accuracy Current Sense Amplifier (IADPT and IBAT)

A high-accuracy current sense amplifier (CSA) is used to monitor the input current during forward charging, or

output current during OTG (IADPT) and the charge/discharge current (IBAT). IADPT voltage is 20× or 40× the

differential voltage across ACP and ACN. IBAT voltage is 8×/16× of the differential across SRP and SRN. After

input voltage or battery voltage is above UVLO, IADPT output becomes valid. To lower the voltage on current

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BQ25730

SLUSE65A – FEBRUARY 2021 – REVISED JANUARY 2024

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