參數(shù)資料
型號(hào)： TEA1201TS
廠(chǎng)商： NXP SEMICONDUCTORS
元件分類(lèi)： 穩(wěn)壓器
英文描述： 0.95 V starting basic power unit
中文描述： 5 A SWITCHING REGULATOR, 720 kHz SWITCHING FREQ-MAX, PDSO16
封裝： 4.40 MM, PLASTIC, MO-152, SOT-369-1, SSOP-16
文件頁(yè)數(shù)： 9/24頁(yè)
文件大?。?/td> 108K
代理商： TEA1201TS
2002 Jun 06
9
Philips Semiconductors
Product specification
0.95 V starting basic power unit
TEA1201TS
8.5
Shut-down
When the shut-down input is set HIGH, the DC-to-DC
converter disables both switches and power consumption
is reduced to a few microamperes.
8.6
Power switches
The power switches in the IC are one N-type and one
P-type power MOSFET, both having a typical
drain-to-source resistance of 100 m
. The maximum
average current in the power switches is 1.0 A at
T
amb
= 80
°
C.
8.7
Temperature protection
When the DC-to-DC converter operates in the PWM
mode, and the die temperature gets too high (typical value
is 190
°
C), the converter and the switch stop operating.
They resume operation when the die temperature falls
below 90
°
C again. As a result, low frequency cycling
between the on and off state will occur. It should be noted
that in the event of device temperatures at the cut-off limit,
the application differs strongly from maximum
specifications.
8.8
Current limiters
If the current in one of the power switches exceeds the
programmed limit in the PWM mode, the current ramp is
stopped immediately and the next switching phase is
entered. Current limiting is required to keep power
conversion efficient during temporary high loads.
Furthermore, current limiting protects the IC against
overload conditions, inductor saturation, etc.
The current limiting level is set by an external resistor
whichmustbeconnectedbetweenpin ILIMandgroundfor
downconversion, or between pins ILIM and UPOUT/DNIN
for upconversion.
8.9
External synchronization and PWM-only mode
If an external high-frequency clock or a HIGH level is
applied to pin SYNC/PWM, the TEA1201TS will use PWM
regulation independent of the load applied.
In the event of a high-frequency clock being applied, the
switching frequency in the PWM mode will be exactly that
frequency divided by 22. In the PWM mode the quiescent
current of the device increases.
In the event that no external synchronization or PWM
mode selection is necessary, pin SYNC/PWM must be
connected to ground.
8.10
Behaviour at input voltage exceeding the
specified range
In general, an input voltage exceeding the specified range
is not recommended since instability may occur. There are
two exceptions:
1.
Upconversion: at an input voltage higher than the
target output voltage, but up to 5.5 V, the converter will
stop switching and the external Schottky diode will
take over. The output voltage will equal the input
voltage minus the diode voltage drop. Since all current
flows through the external diode in this situation, the
current limiting function is not active.
In the PWM mode, the P-type power MOSFET is
always on when the input voltage exceeds the target
output voltage. The internal synchronous rectifier
ensures that the inductor current does not fall below
zero. As a result, the achieved efficiency is higher in
this situation than standard PWM-controlled
converters achieve.
2.
Downconversion: when the input voltage is lower than
the target output voltage, but higher than 2.2 V, the
P-type power MOSFET will stay conducting resulting
in an output voltage being equal to the input voltage
minussomeresistivevoltagedrop.Thecurrentlimiting
function remains active.
8.11
Control of the additional switch
The switch will be in the on-state when its feedback input
is connected to ground. When the feedback input is higher
than 2 V, the power FET will be high-ohmic. The switch
always turns to the high-ohmic state when the shutdown
input is made HIGH.
8.12
Low battery detector
The low battery detector is an autonomous circuit which
can work at an input voltage down to 0.90 V. It is always
on, even when all other blocks are in the shut-down mode.
The low battery input (pin LBI1) is tuned to accept a 1-cell
NiCd or NiMH battery voltage directly. Hysteresis is
included for correct operation.
The output of the low battery detector on pin LBO is an
open-collector output. The output is high (i.e. no current is
sunk by the collector) when the input voltage of the
detector is below the lower detection level.
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