- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄372108 > SAA1504T (NXP SEMICONDUCTORS) Safety IC(安全保護芯片) PDF資料下載
參數(shù)資料
| 型號： | SAA1504T |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 電源管理 |
| 英文描述： | Safety IC(安全保護芯片) |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | 3.90 MM, PLASTIC, MS-012, SOT-96-1, SOP-8 |
| 文件頁數(shù)： | 6/16頁 |
| 文件大?。?/td> | 80K |
| 代理商： | SAA1504T |
2000 Mar 07
6
Philips Semiconductors
Objective specification
Safety IC
SAA1504T
Charge inhibit mode
When V
bat
> 4.18 V, the charge inhibit mode will be
entered (see Fig.4). At this mode the battery can only be
discharged (CO = 0 and DO = 1).
The excess charge delay can be set by means of an
external capacitor. The delay is then defined as:
t
ed(det)
= 30
×
C
CEXT
with t
ed(det)
in ms and C
CEXT
in nF.
When V
bat
< 3.95 V, the safety IC will return from the
charge inhibit mode to the normal operating mode.
The charge inhibit mode will also be entered as soon as a
charge current is detected in the discharge enable mode
Discharge enable mode
When the safety IC is in the charge inhibit mode, charging
of the battery is disabled because SW1 is open. Initially
discharge of the battery will then occur via the backgate
diodeofSW1.Theloadvoltagewillbeapproximately0.6 V
lower and dissipation of the backgate diode of SW1 will
occur. It is preferable to close both switches at that time
without allowing charging of the battery until V
bat
< 3.95 V.
If a discharge current is detected in the charge inhibit
mode, the system will activate the discharge enable mode,
closing both switches.
From the discharge enable mode the charge inhibit mode
will be entered again as soon as a charge current is
detected or V
bat
> 4.18 V. The detection of a higher
voltage than 4.18 V is necessary. If the battery is charged
with a very low charge current, the safety IC will not switch
from the discharge enable mode to the charge inhibit
mode.Eventually,thesafety ICwillenterthechargeinhibit
mode if the battery is overcharged to V
bat
> 4.18 V
because of a small charge current.
When V
bat
< 3.95 V the safety IC will return from the
discharge enable to the normal operating mode.
If the safety IC is in the charge inhibit mode, it will usually
go to the normal operating mode via the discharge enable
mode. But if the system is in the charge inhibit mode and
the battery pack is stored for several years, the battery
voltage can drop because of the battery discharge by the
safety IC and the self discharge of the battery. So a
voltage drop of the battery is possible, without detecting a
discharge current. Because of this, the normal operating
mode should also be entered from the charge inhibit mode
whenV
bat
< 3.95 Vandnotonlyfromthedischargeenable
mode. In this way, charging a battery is always possible if
V
bat
< 3.95 V.
handbook, full pagewidth
MGS973
discharge enable
CO, DO
to previous mode
from all modes
Vbat
<
1.9 V
or
Vbat
<
2.3 V at 5 ms
normal operating
CO, DO
power down
CO, DO
disable mode
(1)
CO, DO
charge inhibit
CO, DO
VVM
>
480 mV
T
>
100
°
C
or
I
>
Imax
185 mV
<
VVM
<
175 mV
and
T
<
60
°
C
Vbat
>
2.6 V
and
VVM
<
185 mV
Vbat
>
4.18 V
or
VVM
<
10 mV
Vbat
>
4.18 V
Vbat
<
3.95 V
Vbat
<
3.95 V
Fig.4 Flow diagram.
(1) Minimum time in the disable mode is about 5 ms.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SAA1575HL | Global Positioning System (GPS)baseband processor(通用定位系統(tǒng)基帶處理器) |
| SAA2023GP | Drive processor for DCC systems |
| SAA2023 | Drive processor for DCC systems |
| SAA2023H | RES 4.53K OHM 1/16W 0.5% 0402SMD |
| SAA2500 | MPEG Audio Source Decoder |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SA-A1520 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CRYSTAL CLOCK OSCILLATORS |
| SA-A1521 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CRYSTAL CLOCK OSCILLATORS |
| SA-A1527 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CRYSTAL CLOCK OSCILLATORS |
| SA-A1529 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CRYSTAL CLOCK OSCILLATORS |
| SA-A152A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CRYSTAL CLOCK OSCILLATORS |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。