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TPS61061DRBR Datasheet(PDF) 9 Page - Texas Instruments |
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TPS61061DRBR Datasheet(HTML) 9 Page - Texas Instruments |
9 / 22 page www.ti.com 500 ns/div SW 10 V/div Input Voltage 20 mV/div DETAILED DESCRIPTION OPERATION START-UP SHORT-CIRCUIT PROTECTION TPS61060 TPS61061 TPS61062 SLVS538 – NOVEMBER 2004 INPUT VOLTAGE RIPPLE Figure 14. The TPS61060/61/62 family is a constant-frequency, PWM current-mode converter with integrated N-channel MOSFET switch and synchronous P-channel MOSFET rectifier. The device operates in pulse width modulation (PWM) with a fixed switching frequency of 1 MHz. Operation is understood best by referring to the block diagram. The duty cycle of the converter is set by the error amplifier and the sawtooth ramp applied to the comparator. Because the control architecture is based on a current-mode control, a compensation ramp is added to allow stable operation for duty cycles larger than 50%. The converter is a fully integrated synchronous boost converter operating always in continuous conduction mode. This allows low noise operation and avoids ringing on the switch pin as it would be seen on a converter when entering discontinuous conduction mode. To avoid high inrush current during start-up, special care is taken to control the inrush current. When the device is first enabled, the output capacitor is charged with a constant precharge current of typically 100 mA until the output voltage is typically 0.3 V below Vin. The the device starts with a reduced analog controlled current limit for typically 40 µs. After this time period, the device enters its normal regulation with full current limit. The start-up current waveform is shown in Figure 11. The fixed precharge current during start-up allows the device to start up without problems when driving LEDs because the LED only starts to conduct current when the forward voltage is reached. If, for any reason a resistive load is driven, the maximum start-up load current needs to be smaller, or equal to, the precharge current. The TPS6106x family has an advanced short-circuit protection in case the output of the device is shorted to ground. Because the device is configured as a current source even when the LEDs are shorted, the maximum current is controlled by the sense resistor Rs. As an additional safety feature, the TPS6106x series also protects the device and inductor when the output is shorted to ground. When the output is shorted to ground, the device enters precharge mode and limits the maximum current to typically 100 mA. 9 |
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