參數(shù)資料
型號(hào)： TEA1200TS
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： 穩(wěn)壓器
英文描述： 0.95 V starting DC-to-DC converter with low battery indicator
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)： 8/24頁(yè)
文件大?。?/td> 104K
代理商： TEA1200TS
2002 May 14
8
Philips Semiconductors
Product specification
0.95 V starting DC-to-DC converter
with low battery indicator
TEA1200TS
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 will stop operating. It resumes
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.
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.
External synchronization and PWM-only mode
If an external high-frequency clock or a HIGH level is
applied to pin SYNC/PWM, the TEA1200TS will use PWM
regulation independent of the load applied.
In the event that a high-frequency clock is 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.
Behaviour when the input voltage exceeds 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 the output voltage being equal to the input voltage
minussomeresistivevoltagedrop.Thecurrentlimiting
function remains active.
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 adjusted to accept a
1-cell NiCd or NiMH battery voltage directly. Hysteresis is
included for proper operating.
The output of the low battery detector (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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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TEA1201TS 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:0.95 V starting basic power unit
TEA1202 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:Battery power unit
TEA1202TS 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:Battery power unit
TEA1204 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:High efficiency DC/DC converter
TEA1204T 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:High efficiency DC/DC converter
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