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參數(shù)資料
| 型號： | 74LV4799D |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 電源管理 |
| 英文描述： | Timer for NiCd and NiMH chargers |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 文件頁數(shù)： | 10/18頁 |
| 文件大小： | 162K |
| 代理商： | 74LV4799D |
Philips Semiconductors
Product specification
74LV4799
Timer for NiCd and NiMH chargers
1998 Apr 20
10
Charge discharge times
PARAMETER
TIME RANGE
CONDITIONS
Charge time
4 hours to 16 hours
Components ranges are within the values
given in Section “External components range”
given in Section External com onents range
Discharge time
15 minutes to to 4.7 hours
Self-discharge time
50 days to 100 days
LED frequency
The frequency of the LED output (pin1) is determined by the oscillator frequency.
Three modes of operation, each with its own frequency, are possible.
f
D
32
1
8
fC
6
fS
f
C
256
Mode
SEL
LED frequency
Charge
Trickle charge
Alarm
H or open
L
H
MOLLI pulse duration
The MOLLI output gives an output signal of four periods with a 50%
duty cycle. The duration of one period is determined by: 16/f
s
Timing accuracy.
The timing accuracy depends on the accuracy of the on–chip
oscillator and on the external R and C components. The inaccuracy
of the on–chip oscillator is specified as maximum +/–7%. In most
cases the actual inaccuracy will be significantly lower. This depends
on the supply voltage as well as the value of the external
components.
Influence of Resistor value.
Low resistor values cause some spread because the RC
combination is biased by a 3–State push–pull output. The spread of
the R
on
of the push–pull stage will contribute to the frequency
spread. When high–value resistors are used, any possible output
leakage of the not–selected 3–State outputs will cause a frequency
deviation. For these reasons, the resistor values must be within the
specified ranges.
Influence of supply voltage
The trip levels of the oscillator are fixed at 20% and 80% of V
cc
. At
higher supply voltages the spread of the trip levels decreases in
greater proportion because the offset voltage remains constant, and
the propagation delay decreases. Furthermore, the R
on
values of
the push–pull driving stage decrease at higher voltages.
SPREAD-CAUSING FACTORS
SYMBOL
PARAMETER
V
(V)
T
amb
(
°
C)
TYP
7
7
22
5.5
170
25
250
35
1300
180
1300
180
UNIT
MIN
MAX
V
off
Offset voltage
1.0
6.0
1.0
6.0
1.0
6.0
1.0
6.0
1.0
6.0
1.0
6.0
mV
mV
t
P
Propagation delay
Pro agation delay
s
s
R
ON
outputs
P-channel resistance R
C
, R
D
out uts
R
ON
outputs
N-channel resistance R
C
, R
D
out uts
R
ON
output
P-channel resistance R
S
out ut
R
ON
output
N-channel resistance R
S
out ut
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 74LV4799D,112 | 功能描述:計(jì)時(shí)器和支持產(chǎn)品 3.3V TIMER NICD AND RoHS:否 制造商:Micrel 類型:Standard 封裝 / 箱體:SOT-23 內(nèi)部定時(shí)器數(shù)量:1 電源電壓-最大:18 V 電源電壓-最小:2.7 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
| 74LV4799D,118 | 功能描述:計(jì)時(shí)器和支持產(chǎn)品 3.3V TIMER NICD AND RoHS:否 制造商:Micrel 類型:Standard 封裝 / 箱體:SOT-23 內(nèi)部定時(shí)器數(shù)量:1 電源電壓-最大:18 V 電源電壓-最小:2.7 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
| 74LV4799DB | 功能描述:計(jì)時(shí)器和支持產(chǎn)品 3.3V TIMER NICD AND NIMH CHARGER RoHS:否 制造商:Micrel 類型:Standard 封裝 / 箱體:SOT-23 內(nèi)部定時(shí)器數(shù)量:1 電源電壓-最大:18 V 電源電壓-最小:2.7 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
| 74LV4799DB,112 | 功能描述:計(jì)時(shí)器和支持產(chǎn)品 3.3V TIMER NICD AND RoHS:否 制造商:Micrel 類型:Standard 封裝 / 箱體:SOT-23 內(nèi)部定時(shí)器數(shù)量:1 電源電壓-最大:18 V 電源電壓-最小:2.7 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
| 74LV4799DB,118 | 功能描述:計(jì)時(shí)器和支持產(chǎn)品 3.3V TIMER NICD AND RoHS:否 制造商:Micrel 類型:Standard 封裝 / 箱體:SOT-23 內(nèi)部定時(shí)器數(shù)量:1 電源電壓-最大:18 V 電源電壓-最小:2.7 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
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