參數(shù)資料
型號： 74LV4799N
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, PDIP16
文件頁數(shù)： 9/18頁
文件大?。?/td> 162K
代理商： 74LV4799N
Philips Semiconductors
Product specification
74LV4799
Timer for NiCd and NiMH chargers
1998 Apr 20
9
AC CHARACTERISTICS
GND = 0V; t
r
= t
f
≤
2.5ns; C
L
= 50pF
TEST CONDITIONS
T
amb
(
°
C)
SYMBOL
PARAMETER
+25
TYP
–4
–2
50
50
50
50
67
65
0 to +70
MIN
UNIT
V
CC
(V)
1.0
6.0
1.0
6.0
1.0
6.0
1.0
6.0
1.0
6.0
1.0
6.0
MIN
–11
–9
–
–
–
–
–
–
100
100
MAX
+3
+5
MAX
f
Oscillator frequency spread
Oscillator frequency s read
Any resistor or capacitor according
the application information, see note 1
%
δ
LED
Duty factor at pin 1
Duty factor at in 1
See Note 2
%
δ
MOLLI
Duty factor at pin 6
Duty factor at in 6
See Note 3
%
d b
t
deb
Debounce suppression at pin 9
ms
ression at in 9
f
i(max)
Maximum frequency
sense input
kHz
i( i )
f
i(min)
Minimum frequency
sense input
50
50
Hz
NOTES:
1. The oscillator frequency can be calculated by: f
2. During blinking.
3. An output signal of four periods will appear in case of discharged batteries and DIS is switched HIGH.
0.36
R
C1
APPLICATION INFORMATION
Oscillator.
The frequency will be determined by the external components R
C
, R
D
, R
S
, and C
1
. The frequencies can be calculated by the following
expressions: f
R
C
R
C1
R
S
R
C
and C1 determine the charge time.
R
D
and C1 determine the discharge time.
R
S
and C1 determine the self-charge time.
0.36
C1; f
0.36
; f
0.36
C1.
The charge, discharge and self-discharge times can be calculated as follows:
Charge time
2
22
f
C
; Discharge time
2
18
f
D
; Self-discharge time
2
27
f
S
In the trickle charge mode, the average charge current will be reduced by a factor:
1
3 x R
S
4 x R
C
1
External components range
TEST CONDITIONS
T
amb
(
°
C)
+25
TYP
SYMBOL
PARAMETER
UNIT
V
CC
(V)
1.0
2.0
4.5
6.0
1.0
2.0
4.5
6.0
1.0
2.0
4.5
6.0
V
1
OTHER
MIN
5.360
1.150
0.562
0.511
42.20
9.09
4.22
3.32
MAX
100
100
100
100
825
825
825
825
no limit
no limit
no limit
no limit
k
R
C
/R
D
Resistor range
C1 = 0 22
μ
C1 = 0.22
F
k
k
R
S
Resistor range
C1 = 0 22
μ
C1 = 0.22
F
k
pF
C1
Capacitor range
Ca acitor range
pF
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74LV4799PWDH 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Timer for NiCd and NiMH chargers
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