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ZHCSQJ5A may 2022 – march 2023 TPS62903-Q1

PRODUCTION DATA

封裝選項(xiàng)

機(jī)械數(shù)據(jù) (封裝 | 引腳)

RYT|9
- MPSS145A

散熱焊盤機(jī)械數(shù)據(jù) (封裝 | 引腳)

訂購信息

zhcsqj5a_oa

8.3.9 Current Limit and Short-Circuit Protection

The TPS62903-Q1 is protected against overload and short-circuit events. If the inductor current exceeds the high-side FET current limit (I_LIMH), the high-side switch is turned off and the low-side switch is turned on to ramp down the inductor current. The high-side FET turns on again only if the current in the low-side FET has decreased below the low-side FET current limit threshold AND the internal I_LIM recovery delay has expired.

Note: While the internal recovery delay generally keeps the switching frequency within the normal operating range of the device , the switching frequency is not tightly controlled during overload events.

Due to internal propagation delay, the actual current can exceed the static current limit during that time. The dynamic current limit is given as Equation 2:

Equation 2.

I_{p e a k (t y p)} = I_{L I M H} + \frac{V_{L}}{L} \times t_{p d}

where

I_LIMH is the static high-side FET current limit as specified in the Electrical Characteristics.
L is the effective inductance at the peak current.
V_L is the voltage across the inductor (V_IN–V_OUT).
t_PD is the internal propagation delay of typically 50 ns.

The current limit can exceed static values, especially if the input voltage is high and very small inductance is used. The dynamic high-side switch peak current can be calculated as follows:

Equation 3.

I_{p e a k (t y p)} = I_{L I M H} + \frac{V_{V I N} - V_{V O U T}}{L} \times 50 n s

The TPS62903-Q1 also includes a low-side negative current limit (I_LIM:SINK) to protect against excessive negative currents that can occur in forced PMW mode under heavy to light load transient conditions. If the negative current in the low-side switch exceeds the I_LIM:SINK threshold, the low-side switch is disabled. Both the low-side and high-side switches remain off until an internal timer re-enables the high-side switch based on the selected PWM switching frequency.

CAUTION: If Forced PWM (FPWM) mode is being used, TI recommends that the inductor be sized such that the inductor ripple current, ΔI_L (see Equation 9), does not exceed 2.6 A to avoid the potential for continuous operation of the negative current limit with no output load (I_O = 0 A).