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TPS61300YFFR Datasheet(PDF) 16 Page - Texas Instruments

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No. de Pieza. TPS61300YFFR
Descripción  TPS6130xx 1.5-A and 4.1-A Multiple LED Camera Flash Driver With I2C Compatible Interface
Descarga  70 Pages
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Fabricante  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS61300YFFR Datasheet(HTML) 16 Page - Texas Instruments

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TPS61300, TPS61301
TPS61305, TPS61305A, TPS61306
SLVS957E – JUNE 2009 – REVISED APRIL 2016
www.ti.com
Product Folder Links: TPS61300 TPS61301 TPS61305
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Copyright © 2009–2016, Texas Instruments Incorporated
8 Detailed Description
8.1 Overview
The TPS6130xx family employs a 2-MHz fixed ON-time, PWM current-mode converter to generate the output
voltage required to drive up to three high-power LEDs in parallel. The device integrates a power stage based on
an NMOS switch and a synchronous PMOS rectifier. The device also implements a set of linear low-side current
regulators to control the LED current when the battery voltage is higher than the diode forward voltage.
A special circuit is applied to disconnect the load from the battery during shutdown of the converter. In
conventional synchronous rectifier circuits, the back-gate diode of the high-side PMOS is forward biased in
shutdown and allows current flowing from the battery to the output. This device, however, uses a special circuit
which takes the cathode of the back-gate diode of the high-side PMOS and disconnects it from the source when
the regulator is in shutdown (HC_SEL = L).
The TPS6130xx device cannot only operate as a regulated current source but also as a standard voltage boost
regulator featuring power-save mode for improved efficiency at light load. The voltage mode operation can be
activated either by a software command or by means of a hardware signal (ENVM). This additional operating
mode can be useful to properly synchronize the converter when supplying other high power consuming devices
in the system, such as hands-free audio power amplifiers, or any other component requiring a supply voltage
higher than the battery voltage.
The TPS6130xx device also supports storage capacitor on its output (so called energy storage mode). In this
operating mode (HC_SEL = H), the inductive power stage is used to charge up the super-capacitor to a user-
selectable value. Once the charge-up is complete, the LEDs can be fired up to 1025 mA (LED1 and LED3) and
2050 mA (LED2) without causing a battery overload.
In general, a boost converter only regulates output voltages which are higher than the input voltage. This device
operates differently. For example, in the voltage mode operation the device is capable of regulating 4.2 V at the
output from a battery voltage pulsing as high 5.5 V. To control these applications properly, a down-conversion
mode is implemented.
If the input voltage reaches or exceeds the output voltage, the converter changes to a down-conversion mode. In
this mode, the control circuit changes the behavior of the rectifying PMOS. It sets the voltage drop across the
PMOS as high as needed to regulate the output voltage. This means the power losses in the converter increase.
This must be considered for thermal consideration.
In direct drive mode (HC_SEL = L), the power stage is capable of supplying a maximum total current of roughly
1300 to 1500 mA. The TPS61300 provides three constant current inputs, capable of sinking up to 400 mA (LED1
and LED3) and 800 mA (LED2) in flashlight mode.
The TPS6130xx integrates an I2C compatible interface allowing transfers up to 3.4 Mbits/s. This communication
interface can be used to set the operating mode (shutdown, constant output current mode vs constant output
voltage mode), to control the brightness of the external LED (DC light and flashlight modes), to adjust the output
voltage (between 3.825 V and 5.7 V in 125-mV steps) or to program the safety timer for instance. See Register
Maps.
In the TPS6130xx device, the DC light and flash can be controlled either by the I2C interface or by the means of
hardware control signals (ENDCL and FLASH_SYNC). To simplify flashlight synchronization with the camera
module, the device offers a FLASH_SYNC strobe input pin to turn, with zero latency, the LED current from DC
light to flashlight.
The maximum duration of the flashlight pulse can be limited by means of an internal user programmable safety
timer (STIM). To avoid the LEDs to be kept accidentally ON in DC light mode by software control, the device
implements a 11.2-s watchdog timer.


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