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TEA1211 Datasheet(PDF) 5 Page - NXP Semiconductors |
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TEA1211 Datasheet(HTML) 5 Page - NXP Semiconductors |
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5 / 23 page  2003 Oct 13 5 Philips Semiconductors Preliminary specification High efficiency auto-up/down DC/DC converter TEA1211HN handbook, halfpage n.c. n.c. GND GND LXA LXA IN LXA MDB002 GND n.c. GND n.c. LXB LXB OUT LXB 2 1 3 4 5 6 7 8 24 23 21 22 20 19 18 17 TEA1211HN Fig.2 Pin configuration. This diagram is a bottom side view. Pin 1 is indicated with a dot on the top side of the package. For mechanical details of HVQFN32 package, see Chapter 12. 7 FUNCTIONAL DESCRIPTION 7.1 Introduction The TEA1211HN is able to operate in Pulse Frequency Modulation (PFM) or discontinuous conduction mode as well as in Pulse Width Modulation (PWM) or continuous conduction mode. All switching actions are completely determined by a digital control circuit which uses the output voltage level as control input. This digital approach enables the use of a new pulse width and frequency modulation scheme, which ensures optimum power efficiency over the complete range of operation of the converter. 7.2 Control mechanism Depending on load current Iload and VIN to VOUT ratio, the controller chooses a mode of operation. When high output power is requested, the device will operate in PWM (continuous conduction) mode, which is a 2-phase cycle in up- as well as in down mode. For small load currents the controller will switch over to PFM (discontinuous mode), which is either a 3- or 4-phase cycle depending on the input to output ratio, see Fig.3. handbook, halfpage MDB003 0 PWM Icoil PFM VIN > VOUT down mode VIN = VOUT stationary mode VIN < VOUT up mode Fig.3 Waveform of coil current as function of Iload and VIN to VOUT ratio. |
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