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TPS62153AQRGTTQ1 Datasheet(PDF) 10 Page - Texas Instruments |
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TPS62153AQRGTTQ1 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 35 page control logic Soft start Thermal Shtdwn UVLO PG control power control error amplifier gate drive HS lim LS lim PVIN PVIN AVIN PG PGND PGND AGND comp comp + _ timer tON DCS - Control TM direct control & compensation comparator ramp SW SW SW EN * SS/TR DEF * LOG VOS FB * * This pin is connected to a pull down resistor internally (see Detailed Description section). TPS62150A-Q1, TPS62153A-Q1 SLVSCC3 – MAY 2014 www.ti.com Functional Block Diagram (continued) Figure 15. TPS62153A-Q1 (5V Fixed Output Voltage) 10.3 Feature Description 10.3.1 Pulse Width Modulation (PWM) Operation The TPS6215xA-Q1 operates with pulse width modulation in continuous conduction mode (CCM) with a nominal switching frequency of 2.5 MHz. The frequency variation in PWM is controlled and depends on VIN, VOUT and the inductance. The device operates in PWM mode as long the output current is higher than half the inductor's ripple current. To maintain high efficiency at light loads, the device enters Power Save Mode at the boundary to discontinuous conduction mode (DCM). PSM operation occurs if the output current becomes smaller than half the inductor's ripple current. 10.3.2 Power Save Mode Operation If the load current decreases, The built-in Power Save Mode of the TPS6215xA-Q1 is entered seamlessly, . This secures a high efficiency in light load operation. The device remains in Power Save Mode as long as the inductor current is discontinuous. In Power Save Mode, the switching frequency decreases linearly with the load current maintaining high efficiency. The transition into and out of Power Save Mode happens within the entire regulation scheme and is seamless in both directions. TPS6215xA-Q1 includes a fixed on-time circuitry. This on-time, in steady-state operation, can be estimated as: 10 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated Product Folder Links: TPS62150A-Q1 TPS62153A-Q1 |
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