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TPS61300YFFR Datasheet(PDF) 22 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) 22 Page - Texas Instruments

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1.02 VOUT (NOM)
0.98 VOUT (NOM)
VOUT (NOM) = 4.2 V
OVP Threshold
DynamicLoad Transient
LEDDisconnect
4.65 V ±150 mV
22
TPS61300, TPS61301
TPS61305, TPS61305A, TPS61306
SLVS957E – JUNE 2009 – REVISED APRIL 2016
www.ti.com
Product Folder Links: TPS61300 TPS61301 TPS61305
Submit Documentation Feedback
Copyright © 2009–2016, Texas Instruments Incorporated
8.3 Feature Description
8.3.1 Safety Timer Accuracy
The LED strobe timer uses the internal oscillator as reference clock. The timer execution speed (see
REGISTER3 for more information on STIM[2:0]) scales according to the reference clock accuracy.
(1)
See REGISTER3 for more information.
(2)
See Electrical Characteristics.
Table 3. Frequency for Safety Timer
OSCILLATOR FREQUENCY
SAFETY TIMER DURATION
Minimum
Maximum = Typical × (1 + fACC)
(1)
Typical
Typical(2)
Maximum
Minimum = Typical x (1 – fACC)
(1)
8.3.2 LED Failure Modes and Overvoltage Protection
If a high-power LED fails as a short circuit, the low-side current regulator will limit the maximum output current
and the HIGH-POWER LED FAILURE (HPLF) flag will be set.
If a high-power LED fails as an open circuit, the control loop will initially attempt to regulate off of its low-side
current regulator feedback signal. This will drive VOUT higher. Because the open-circuited LED will never accept
its programmed current, VOUT must be voltage-limited by means of a secondary control loop.
The TPS6130xx device limits VOUT according to the overvoltage protection settings (refer to the OVP
specification). In this failure mode, VOUT is either limited to 4.65 V (typical) or 6 V (typical) and the HIGH-POWER
LED FAILURE (HPLF) flag is set.
Table 4. Overvoltage Protection Threshold
OVP THRESHOLD
OPERATING CONDITIONS
4.65-V typical
HC_SEL = L and 0000
≤ OV[3:0] ≤ 0100
6-V typical
HC_SEL = H or 0101
≤ OV[3:0] ≤ 1111
See LED High-Current Regulators, Unused Inputs for more information.
Figure 35. Overvoltage Protection Operation (4.65-V Typical)


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