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參數資料
型號: TPS56100PWPRG4
廠商: TEXAS INSTRUMENTS INC
元件分類: 穩壓器
英文描述: 1.4 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO28
封裝: GREEN, PLASTIC, HTSSOP-28
文件頁數: 28/30頁
文件大小: 595K
代理商: TPS56100PWPRG4
TPS56100
HIGHEFFICIENCY DSP POWER SUPPLY CONTROLLER
FOR 5V INPUT SYSTEMS
SLVS201A JUNE 1999 REVISED JULY 1999
7
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
detailed description (continued)
overcurrent protection
The overcurrent protection (OCP) circuit monitors the current through the high-side FET. The overcurrent
threshold is adjustable with an external resistor divider between IOUT and ANAGND, with the divider voltage
connected to the OCP pin. If the voltage on OCP exceeds 100 mV, then a fault latch is set and the output drivers
are turned off. The latch will remain set until VCC goes below the undervoltage lockout value and back up above
3.6 V or INHIBIT is similarly brought below its stop threshold and back above its start threshold. A 3-
s deglitch
timer is included for noise immunity. The OCP circuit is also designed to protect the high-side power FET against
a short-to-ground fault on the terminal common to both power FETs.
LODRV
The LODRV circuit is designed to protect the microprocessor against overvoltages that can occur if the high-side
power FETs become shorted. External components sensing an overvoltage condition are required to use this
feature. When an overvoltage fault occurs, the low-side FETs are used as a crowbar. LODRV is pulled low and
the low-side FET will be turned on, overriding all control signals inside the TPS5210 controller. The crowbar
action will short the input supply to ground through the faulted high-side FETs and the low-side FETs. A fuse
in series with Vin should be added to disconnect the short circuit.
Table 1. Voltage Programming Codes
VP TERMINALS
(0 = GND, 1 = floating or pull-up to 5 V)
VREF
VP4
VP3
VP2
VP1
VP0
(Vdc)
0
1
1.30
0
1
0
1.35
0
1
0
1
1.40
0
1
0
1.45
0
1
0
1
1.50
0
1
0
1
0
1.55
0
1
0
1
1.60
0
1
0
1.65
0
1
1.70
0
1
0
1.75
0
1
0
1
1.80
0
1
0
1.85
0
1
1.90
0
1
0
1.95
0
1
2.00
0
2.05
1
No CPU
1
0
2.10
1
0
1
2.20
1
0
2.30
1
0
1
2.40
1
0
1
0
2.50
1
0
1
2.60
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