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TPS61300YFFR Datasheet(PDF) 36 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) 36 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
8.4.8 Hardware Voltage Mode Selection
The TPS6130xx device integrates a logic input (ENVM) or a software control bit (ENVM bit) that can be used to
force the converter to run in voltage mode regulation. Pulling the ENVM pin high forces the device into voltage
regulation mode (VOUT is preset to a fixed value, 4.95 V). This additional operating mode can be useful to supply
other high power consuming devices in the system, such as hands-free audio power amplifiers, or any other
component requiring a regulated supply voltage higher or lower than the battery voltage.
Table 10 gives an overview of the different mode of operation.
Table 10. Operating Mode Description
INTERNAL REGISTER
SETTINGS
MODE_CTRL[1:0]
ENVM BIT
OPERATING MODES
00
0
The converter is in shutdown mode and the load is disconnected from the battery.
01
0
LEDs are turned-on for DC light operation (for example, movie-light). The converter is
operating in the current regulation mode (CM). The output voltage is controlled by the forward
voltage characteristic of the LED. The energy is being directly transferred from the battery to the
output.
The integrated current control loop automatically selects the minimum boosting ratio to maintain
regulation based on the LED forward voltage and current requirements. When running in linear
mode (VF(LED) < VIN), the DC-DC power stage featuring valley-current limit is not active permitting
relatively large currents to circulate from the input to the output of the device.
10
0
The converter is operating in the current regulation mode (CM). The output voltage is controlled
by the forward voltage characteristic of the LED. LEDs are ready for flashlight operation and DC
light operation is supported directly from the battery.
The integrated current control loop automatically selects the minimum boosting ratio to maintain
regulation based on the LED forward voltage and current requirements. When running in linear
mode (VF(LED) < VIN), the DC-DC power stage featuring valley-current limit is not active permitting
relatively large currents to circulate from the input to the output of the device.
In high-current mode (HC_SEL = H), the energy is supplied by the output reservoir
capacitor and the inductive power stage is turned-off for the flash strobe period of time.
11
0
LEDs are turned-off and the converter is operating in the voltage regulation mode (VM). The
output voltage is set through the register OV[3:0].
00
1
LEDs are turned-off and the converter is operating in the voltage regulation mode (VM). The
output voltage is set through the register OV[3:0].
01
1
The converter is operating in the voltage regulation mode (VM) and it’s output voltage is
set through the register OV[3:0]. The LEDs are turned-on for DC light operation and the
energy is being directly transferred from the battery to the output. The LED currents are
regulated by the means of the low-side current sinks.
10
1
The converter is operating in the voltage regulation mode (VM) and it’s output voltage is set
through the register OV[3:0]. The LED currents are regulated by the means of the low-side
current sinks. The LEDs are ready for flashlight operation.
In direct drive mode (HC_SEL = L), the energy is being directly transferred from the battery to the
output.
In high-current mode (HC_SEL = H), the energy is largely supplied by the output reservoir
capacitor. The inductive power stage is turned-on to support DC light operation and to
contribute the flash strobe itself.
11
1
LEDs are turned-off and the converter is operating in the voltage regulation mode (VM). The
output voltage is set through the register OV[3:0].
8.4.9 Shutdown
MODE_CTRL[1:0] bits low force the device into shutdown. The shutdown state can only be entered when the
voltage regulation and DC light modes are both turned-off (ENVM = 0 and ENDCL = 0).
In direct drive mode (HC_SEL = L), the regulator stops switching, the high-side PMOS disconnects the load from
the input and the LEDx pins are high impedance thus eliminating any DC conduction path. The TPS6130xx
device actively discharges the output capacitor when it turns off.


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