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TPS61300YFFR Datasheet(PDF) 52 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) 52 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
Depending on the material, size and therefore margin to the rated voltage of the used output capacitor,
degradation on the effective capacitance can be observed. This loss of capacitance is related to the DC bias
voltage applied. TI recommends ensuring the selected capacitors are showing enough effective capacitance
under real operating conditions.
To support high-current camera flash application (HC_SEL = 1), the converter is designed to work with a low
voltage super-capacitor on the output to take advantage of the benefits they offer. A low-voltage super-capacitor
in the 0.1-F to 1.5-F range, and with ESR larger than 40 m
Ω, is suitable in the TPS6130xx application circuit. For
this device the output capacitor must be connected between the VOUT pin and a good ground connection.
9.2.1.2.4
NTC Selection (TPS61305, TPS61305A, TPS61306)
The TPS61305, TPS61305A, and TPS61306 require a negative thermistor (NTC) for sensing the LED
temperature. Once the temperature monitoring feature is activated, a regulated bias current (
≈24 μA) will be
driven out of the TS port and produce a voltage across the thermistor.
If the temperature of the NTC-thermistor rises due to the heat dissipated by the LED, the voltage on the TS input
pin decreases. When this voltage goes below the warning threshold, the LEDWARN bit in REGISTER6 is set.
This flag is cleared by reading the register.
If the voltage on the TS input decreases further and falls below hot threshold, the LEDHOT bit in REGISTER6 is
set and the device goes automatically in shutdown mode to avoid damaging the LED. This status is latched until
the LEDHOT flag gets cleared by software.
The selection of the NTC-thermistor value strongly depends on the power dissipated by the LED and all
components surrounding the temperature sensor and on the cooling capabilities of each specific application. With
a 220-k
Ω (at 25°C) thermistor, the valid temperature window is set between 60°C to 90°C. The temperature
window can be enlarged by adding external resistors to the TS pin application circuit. To ensure proper triggering
of the LEDWARN and LEDHOT flags in noisy environments, the TS signal may require additional filtering
capacitance.
Figure 74. Temperature Monitoring Characteristic


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