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TPS62136RGXR Datasheet(PDF) 11 Page - Texas Instruments |
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TPS62136RGXR Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 45 page  n s L V O U T V I N I I L I M H ty p p e a k 5 0 ) ( ´ - + = PD L LIMH typ peak t L V I I ´ + = ) ( 11 TPS62136, TPS621361 www.ti.com SLVSDV2 – MARCH 2017 Product Folder Links: TPS62136 TPS621361 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated Device Functional Modes (continued) where: IOUT is the output current, RDS(on) is the on-state resistance of the high-side FET and RL is the DC resistance of the inductor used. 9.4.4 HICCUP Current Limit And Short Circuit Protection (TPS62136 only) The TPS62136 is protected against overload and short circuit events. If the inductor current exceeds the 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 current limit threshold. Once the high side switch current limit is triggered for 512 subsequent switching cycles, the device stops switching. After a typical delay of 800 µs, the device begins a new Soft-Start cycle. This is called HICCUP short circuit protection. TPS62136 repeats this mode until the short circuit condition disappears. Due to internal propagation delay, the actual current can exceed the static current limit during that time. The dynamic current limit is given as: (6) where: ILIMH is the static current limit as specified in the electrical characteristics L is the effective inductance at the peak current VL is the voltage across the inductor (VIN - VOUT) and tPD 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 inductances are used. The dynamic high side switch peak current can be calculated as follows: (7) 9.4.5 Current Limit And Short Circuit Protection (TPS621361 only) The TPS621361 is protected by a current limit the same as the TPS62136 but does not turn off after a certain time. This allows it to provide the maximum current, for example, charging a large output capacitance without the need to increase the Soft-Start time. Equation 6 and Equation 7 also apply. 9.4.6 Soft-Start / Tracking (SS/TR) The internal Soft-Start circuitry controls the output voltage slope during startup. This avoids excessive inrush current and ensures a controlled output voltage rise time. It also prevents unwanted voltage drops from high impedance power sources or batteries. When EN is set high to start operation, the device starts switching after a delay of about 200 μs then the internal reference and hence VOUT rises with a slope controlled by an external capacitor connected to the SS/TR pin. Leaving SS/TR pin un-connected provides fastest startup behavior with 150 µs typically. If the device is set to shutdown (EN = GND), undervoltage lockout or thermal shutdown, an internal resistor pulls the SS/TR pin down to ensure a proper low level. Returning from those states causes a new startup sequence as set by the SS/TR connection. A voltage supplied to SS/TR can be used to track a master voltage. The output voltage follows this voltage in both directions up and down in forced PWM mode. In PFM mode, the output voltage decreases based on the load current. The SS/TR pin of several devices must not be connected with each other. |
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