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參數(shù)資料
| 型號(hào)： | L4952 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Voltage Regulator for Car Radio Applications(用于汽車收音機(jī)的電壓穩(wěn)壓器) |
| 中文描述： | 電壓調(diào)節(jié)器的汽車無(wú)線電應(yīng)用（用于汽車收音機(jī)的電壓穩(wěn)壓器） |
| 文件頁(yè)數(shù)： | 5/8頁(yè) |
| 文件大?。?/td> | 99K |
| 代理商： | L4952 |
is High the device is switched on. The diagnostic
circuitrydetect the low drop voltage.
In this case the DIAG output is going low and can
mute the power output stage to avoid noise on
the loudspeaker.The two internal switches can
switch the stabilized output voltage with P-MOS
Transistors to one of the outputs 2 and 3 with low
drop. This is useful to switch the AM and FM cir-
cuitry on or off.
To controlit therearetwodigitalinputsEn
2
andEn
3
one for each switch. EN
2
is High active and EN
3
is
Low active. It’s possible to drive the AM/FM switch
withonedigitalline (EN
2
andEN
3
together).
The driver for the external High side switch can
switch on and off the external pnp transistor. The
drop detection circuitry avoid the damage of the
external power pnp transistor.
To supply the varicaps and the PLL-opampof the
car radio a secondvery low drop 10 V regulatoris
available. This regulator in dropout has a typical
resistance of 50
.
TypicalCharacteristics(Note4)
Function of the external High side switch
driver
Fig 2 shows the principle circuitry of the external
High side switch. Fig. 3 shows the switch on/off
phase of the external High side switch. At the
time t0 the microcontroller switches on (curve 1 =
output signal of the microcontroller).
The signal on the HSON pin of theL4952 is shown
on curve 2. At t1 the external Power pnp is
switched on. At t2 (V
HSON
= V
SON2
) the internal
comparatorcomparesthe drop of the externalpnp.
In case of normaloperationthedropis smaller than
V
Dth
andnofailurewill be detected(curve3).
In case of failure (that mean a higher drop than
V
Dth
) the external power pnp will be switched off
(curve 4). If an error is detectedit will be stored in
the internal error flip-flop. The external pnp can
only be switched on again after having turned
HSON off (V
HSON
< V
SON1
) again.
Figure4:
Logicinput currents versus input
voltage
Figure 3:
Stand by consumptionversus
temperature
Supply voltage rejection (C = 10
μ
F, ESR = 4.7
,
Load at OUT4 = 10k
)
Figure 5:
Supplyrejection versusFrequency.
OUT2propagationdelay (Load= 100
)
Figure6:
OUT2 propagationdelay (Load = 100
)
L4952
5/8
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L4952D | 功能描述:線性穩(wěn)壓器 - 標(biāo)準(zhǔn) 8.6V 0.15A LDO RoHS:否 制造商:STMicroelectronics 輸出類型: 極性: 輸出電壓:1.8 V 輸出電流:150 mA 負(fù)載調(diào)節(jié): 最大輸入電壓:5.5 V 線路調(diào)整率: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-323-5L |
| L4952D013TR | 功能描述:線性穩(wěn)壓器 - 標(biāo)準(zhǔn) 8.6V 0.15A LDO RoHS:否 制造商:STMicroelectronics 輸出類型: 極性: 輸出電壓:1.8 V 輸出電流:150 mA 負(fù)載調(diào)節(jié): 最大輸入電壓:5.5 V 線路調(diào)整率: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-323-5L |
| L4952TS | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:3.1W Stereo-SE Audio Power Amplifier with DC Volume Control |
| L4953 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:MULTIFUNCTION VOLTAGE REGULATOR FOR CAR RADIO |
| L4953G | 功能描述:線性穩(wěn)壓器 - 標(biāo)準(zhǔn) 3-Output 9.2/5/5V RoHS:否 制造商:STMicroelectronics 輸出類型: 極性: 輸出電壓:1.8 V 輸出電流:150 mA 負(fù)載調(diào)節(jié): 最大輸入電壓:5.5 V 線路調(diào)整率: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-323-5L |
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