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參數(shù)資料
| 型號： | TPS535G4 |
| 英文描述： | PHOTOVOLTAIC CELL FOR THERMOPILE DETECTION |
| 中文描述： | 光伏電池的熱電堆檢測 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 231K |
| 代理商： | TPS535G4 |
TPS5300
IMVP MOBILE POWER SUPPLY CONTROLLER
SLVS334 – DECEMBER 2000
13
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
detailed description (continued)
IO linear regulator driver
The IO linear regulator driver circuit drives a high power NPN external power transistor, allowing external power
dissipation. The IO voltage is ramped up with the slowstart with the other two converters. Under voltage
protection protects against hard shorts or extreme loading. The VSENSE_IO voltage is monitored by the VGATE
(powergood) circuit. A fault or shutdown on any converter will shut down the linear regulator.
CLK linear regulator driver
The CLK linear regulator driver circuit drives a lower power NPN external power transistor, allowing external
power dissipation. The CLK voltage is ramped up with the slowstart with the other two converters. Under voltage
protection protects against hard shorts or extreme loading. The VSENSE_CLK voltage is monitored by the
VGATE (powergood) circuit. A fault or shutdown on any converter will shut down the linear regulator.
slowstart
The slowstart circuit controls the rate at which V
OUT
powers up. A capacitor is connected between the SLOWST
and ANAGND pins and is charged by an internal current source. The value of the current source is proportional
to the reference voltage, so that the charging rate of C
slowst
is proportional to the reference voltage. By making
the charging current proportional to V
ref
, the power up time for V
O
will be independent of V
ref
. Thus, C
slowst
can
remain the same value for all VP settings. The slowstart charging current is determined by the following
equation:
I(VREFB)
5
I
SLOWSTART
(amps)
where I
(VREFB)
is the current flowing out of the V
REFB
terminal. It is recommended that no additional loads be
connected to VREFB, other than the resistor divider for setting the hysteresis voltage. Thus, these resistor
values will determine the slowstart charging current. The maximum current that can be sourced by the VREFB
circuit is 500
μ
A. The equation for setting the slowstart time is:
t
SLOWSTART
= 5
×
C
SLOWSTART
×
R
VREFB
(seconds)
where R
(VREFB)
is the total external resistance from VREFB to ANAGND.
VGATE
The VGATE circuit monitors for an undervoltage condition on V
(out_core)
, V
(out_IO)
, and V
(out_CLK)
. If any V
O
is
7% below its reference voltage, or if any UVLO (V
cc
, VR_ON) threshold is not reached, then the VGATE pin is
pulled low. The VGATE terminal is an open drain output.
overvoltage protection
The overvoltage protection circuit monitors Vout_core, Vout_IO, and Vout_CLK for an overvoltage condition.
If any V
O
is 15% above its reference voltage, then a fault latch is set, then both the ripple regulator output drivers
and the linear regulator drivers are turned off. The latch will remain set until V
BIAS
goes below the undervoltage
lockout value or until VR_ON is pulled low.
overcurrent protection
The overcurrent protection circuit monitors the current through the current sense resistor. The overcurrent
threshold is adjustable with an external resistor divider between IOUT and ANAGND terminals, with the divider
voltage connected to the OCP terminal. If the voltage on the OCP terminal exceeds 200 mV, then a fault latch
is set and the output drivers (ripple regulator and linear regulators) are turned off. The latch remains set until
V
BIAS
goes below the undervoltage lockout value or until VR_ON is pulled low.
thermal shutdown
Thermal shutdown disables the controller if the junction temperature exceeds the 165
°
C thermal shutdown trip
point. The hysteresis is 10
°
C.
P
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