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TPS65552A Datasheet

  • TPS65552A

  • 集成的照片閃存充電器和 IGBT 驅(qū)動(dòng)器

  • 773.68KB

  • 18頁(yè)

  • TI

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TPS65552A
SLVS567 鈥?JULY 2005
www.ti.com
Protections
TPS65552A provides three protections: thermal shutdown, max on time, and overvoltage at power SW.
Thermal Shutdown
When TPS65552A overheats, all functions stop. The only way to recover is to wait for the TPS65552A to cool
down. This protection is not through
SHUTDOWN,
so the TPS65552A restarts charging if CHG stays H during
the whole overheated period.
MAX ON Time
To prevent a condition such as pulling current from a poor power source (i.e., an almost empty battery), the
TPS65552A provides a maximum
ON
time protection. If the
ON
time exceeds t
MAX
, the TPS555x is forced
OFF
regardless of I
(PEAK)
detection.
Overvoltage at Power SW
To avoid the stress of power dissipation, the TPS65552A provides an overvoltage monitor function at the SW
terminal. If this protection occurs, the overvoltage status is latched (see
Figure 4
and its descriptions).
This function also protects short-circuit of the secondary side. In the short-circuit state of the secondary side,
almost 100% of the battery voltage is supplied to SW, which stresses the device.
PRODUCT PREVIEW
PCB Information
D1
C1
Note 1
5V
POWER UNIT
3V
Note 4
C2
T1 1:10
or
1:11
or
1:12
R1
V
OUT
V
CC
VBAT
SW
CHG
0 V DS
D Q
F1
Internal
ENA
R1
D Q
F2
XIFULL
U1
V_FULL
V
CC
ENA
U0
U2
I_PEAK
Max ON
LOGIC
30 m鈩?/div>
Note 2
PGND
U3
I_PEAK1
I_PEAK2
V
CC
F_ON
G_IGBT
U4
SW1
5 V Drive IGBT
TSD
NC
Note 3
Figure 8. PCB Design Guideline
10

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