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TPS65552ARGTR Fiches technique(PDF) 9 Page - Texas Instruments

No de pièce TPS65552ARGTR
Description  INTEGRATED PHOTO FLASH CHARGER AND IGBT DRIVER
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
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TPS65552ARGTR Fiches technique(HTML) 9 Page - Texas Instruments

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Programming Peak Current
0.80
1
1.20
1.40
1.60
1.80
2
0
0.5
1
1.5
2
2.5
3
3.5
V(I_PEAK) [V]
IGBT Driver Control
TPS65552A
SLVS567 – JULY 2005
The TPS65552A provides a method to program I(PEAK) through the input voltage of the I_PEAK terminal. Figure 7
shows how to program I(PEAK).
I_PEAK input is treated as a logic input, when its voltage is below V(PKL) (0.6 V) and above V(PKH) (2.4 V).
Between V(PKL) and V(PKH), I_PEAK input is treated as an analog input. Using this characteristic, I(PEAK) can be set
by the logic signal or by an analog input.
Typical usages of this function are:
1. Charging I(PEAK) depends on the battery voltage. Large I(PEAK) for an adequate battery, small I(PEAK) for a poor
battery.
2. Reducing I(PEAK) when zooming lens (motor works); this avoids shutdown of the battery with a large current
output.
In Figure 1, three optional connections to I_PEAK are shown.
1. Use the controller to treat I_PEAK as the logic input pin. This option is the easiest.
2. Use a D/A converter to force I(PEAK) to follow analog information, such as battery voltage.
3. Use an analog circuit to achieve the same results as the D/A converter.
Figure 7. I_PEAK vs I(SW)
The IGBT driver provided by the TPS65552A is a simple buffer in the logical table. Table 3 shows the function
(see Figure 4).
Table 3. IBGT Driver Function Table
F_ON
G_IGBT
L
L
H
H
9
Not Recommended for New designs


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