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TPS62208DBVRG4 Datasheet(PDF) 3 Page - Texas Instruments |
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TPS62208DBVRG4 Datasheet(HTML) 3 Page - Texas Instruments |
3 / 24 page www.ti.com _ + _ + _ + _ + _ + REF REF Load Comparator Skip Comparator Current Limit Comparator P-Channel Power MOSFET Driver Shoot-Through Logic Control Logic Soft Start 1 MHz Oscillator Comparator S R N-Channel Power MOSFET Comparator High Comparator Low Comparator Low 2 V(COMP) Sawtooth Generator V I Undervoltage Lockout Bias Supply _ + Comparator High Comparator Low Comparator Low 2 Compensation VREF = 0.5 V R2 See Note R1 VI EN SW FB GND Gm DETAILED DESCRIPTION OPERATION TPS62200 ,, TPS62201 TPS62202, TPS62203, TPS62207 TPS62204, TPS62205, TPS62208 SLVS417E – MARCH 2002 – REVISED MAY 2006 FUNCTIONAL BLOCK DIAGRAM For the adjustable version (TPS62200) the internal feedback divider is disabled and the FB pin is directly connected to the internal GM amplifier The TPS6220x is a synchronous step-down converter operating with typically 1-MHz fixed frequency pulse width modulation (PWM) at moderate to heavy load currents and in power save mode operating with pulse frequency modulation (PFM) at light load currents. During PWM operation the converter uses a unique fast response, voltage mode, controller scheme with input voltage feed forward. This achieves good line and load regulation and allows the use of small ceramic input and output capacitors. At the beginning of each clock cycle initiated by the clock signal (S), the P-channel MOSFET switch is turned on, and the inductor current ramps up until the comparator trips and the control logic turns off the switch. The current limit comparator also turns off the switch in case the current limit of the P-channel switch is exceeded. Then the N-channel rectifier switch is turned on and the inductor current ramps down. The next cycle is initiated by the clock signal again turning off the N-channel rectifier and turning on the P-channel switch. 3 Submit Documentation Feedback |
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