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TPS61061YZFT Datasheet(PDF) 9 Page - Texas Instruments

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No. de Pieza. TPS61061YZFT
Descripción  CONSTANT CURRENT LED DRIVER WITH DIGITAL AND PWM BRIGHTNESS CONTROL
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Fabricante  TI [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS61061YZFT Datasheet(HTML) 9 Page - Texas Instruments

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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.
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