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TPS92510DGQR Fiches technique(PDF) 11 Page - Texas Instruments

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No de pièce TPS92510DGQR
Description  1.5-A Constant-Current Buck Converter for High-Brightness LEDs with Integrated LED Thermal Foldback
Download  28 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

TPS92510DGQR Fiches technique(HTML) 11 Page - Texas Instruments

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background image
(
)
(
)
DELAY
0.7 V
R1 32 A
t
C1
32 A
-
´
m
=
´
m
TPS92510
www.ti.com
SLUSAE4A – JANUARY 2012 – REVISED AUGUST 2012
OVERVIEW
The TPS92510 is a 60-V, 1.5-A, step-down (buck) regulator with an integrated high-side N-channel MOSFET. To
improve performance during line and load transients the device implements a constant frequency, peak-current
mode control which reduces output capacitance and simplifies external frequency compensation design. The
wide switching frequency of 100 kHz to 2500 kHz allows for efficiency and size optimization when selecting the
output filter components. The switching frequency is adjusted using a resistor to ground on the RT/CLK pin. The
device has an internal phase lock loop (PLL) on the RT/CLK pin that is used to synchronize the power switch
turn on to a falling edge of an external system clock.
The TPS92510 has a default start up voltage of approximately 2.5 V. The EN pin has an internal pull-up current
source that can be used to adjust the input voltage under voltage lockout (UVLO) threshold with two external
resistors. In addition, the pull up current provides a default condition. When the EN pin is floating the device
operates. The operating current is 138
μA when not switching and under no load. When the device is disabled,
the supply current is 1.3
μA.
The integrated 200 m
Ω high-side MOSFET allows for high efficiency power supply designs capable of delivering
1.5 A of continuous current to a load. The TPS92510 reduces the external component count by integrating the
boot recharge diode. The bias voltage for the integrated high-side MOSFET is supplied by a capacitor on the
BOOT to PH pin. The boot capacitor voltage is monitored by an UVLO circuit and turns the high-side MOSFET
off when the boot voltage falls below a preset threshold. The TPS92510 can operate at high duty cycles because
of the boot UVLO.
DETAILED DESCRIPTION
Start-Up
The VIN and EN UVLO conditions must be satisfied before the TPS92510 is allowed to switch. When the EN pin
is held low the device enters a low-power shutdown mode, and some internal circuits are deactivated to conserve
power. When EN returns high these circuits are enabled, which results in a delay of approximately 50 µs (typical)
before switching starts. During start-up the TPS92510 operates in a minimum pulse width mode, which is an
open-loop control. At the start of each switching cycle the internal oscillator initiates a SET pulse. The high-side
MOSFET turns on with a minimum pulse width of 300 ns (typical), independent of the COMP voltage. The device
does not pulse skip. While operating in minimum pulse width mode the LED bypass capacitor is being charged,
causing an in-rush current. Also, the COMP voltage begins to rise as the error amplifier output current charges
the compensation network. When the COMP voltage reaches approximately 0.7 V, the error amplifier is ensured
to be out of saturation and to have sufficient gain to regulate the loop. The TPS92510 then transitions from
minimum pulse width mode to regulation mode. During regulation mode the error amplifier is now in closed-loop
control of the system. The gain of the error amplifier quickly increases the duty cycle, which causes the output
voltage to increase. Once the output voltage approaches the forward voltage of the LED string the LED current
quickly begins to increase until it reaches regulation.
There is a slight delay from the time the VIN and EN UVLO conditions are satisfied until the time the error
amplifier has control of the feedback loop. This delay is a result of the time it takes COMP to charge the
compensation components to 0.7 V. This delay can be approximated as shown in Equation 1 .
where
C1 is the integrator capacitor from COMP to GND
R1 is the resistor in series with the integrator capacitor
(1)
Copyright © 2012, Texas Instruments Incorporated
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