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参数资料
| 型号： | 74LV4799PWDH-T |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 文件页数： | 18/18页 |
| 文件大小： | 179K |
| 代理商： | 74LV4799PWDH-T |
Philips Semiconductors
Product specification
74LV4799
Timer for NiCd and NiMH chargers
1998 Apr 20
9
AC CHARACTERISTICS
GND = 0V; tr = tf ≤ 2.5ns; CL = 50pF
TEST CONDITIONS
Tamb (°C)
SYMBOL
PARAMETER
TEST CONDITIONS
+25
0 to +70
UNIT
VCC(V)
MIN
TYP
MAX
MIN
MAX
f
Oscillator frequency spread
1.0
Any resistor or capacitor according to
–11
–4
+3
%
f
Oscillator frequency s read
6.0
yg
the application information, see note 1
–9
–2
+5
%
δLED
Duty factor at pin 1
1.0
See Note 2
–
50
%
δLED
Duty factor at in 1
6.0
See Note 2
–
50
%
δMOLLI
Duty factor at pin 6
1.0
See Note 3
–
50
%
δMOLLI
Duty factor at in 6
6.0
See Note 3
–
50
%
tdb
Debounce suppression at pin 9
1.0
–
67
ms
tdeb
Debounce su
ression at in 9
6.0
–
65
ms
fi(
)
Maximum frequency at power
1.0
100
kHz
fi(max)
qy
sense input
6.0
100
kHz
fi( i )
Minimum frequency at power
1.0
50
Hz
fi(min)
qy
sense input
6.0
50
Hz
NOTES:
1. The oscillator frequency can be calculated by: f + 0.36
R
C1
2. During blinking.
3. An output signal of four periods will appear in case of discharged batteries and DIS is switched HIGH.
APPLICATION INFORMATION
Oscillator.
The frequency will be determined by the external components RC, RD, RS, and C1. The frequencies can be calculated by the following
expressions: f
+ 0.36
R
C
C1
; f + 0.36
R
D
C1
; f
+ 0.36
R
S
C1
.
RC and C1 determine the charge time.
RD and C1 determine the discharge time.
RS and C1 determine the self-charge time.
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
)
3x R
S
4x R
C
External components range
TEST CONDITIONS
Tamb (°C)
SYMBOL
PARAMETER
TEST CONDITIONS
+25
UNIT
VCC(V)
V1
OTHER
MIN
TYP
MAX
1.0
5.360
100
k
W
RC/RD
Resistor range
2.0
C1=0 22
F
1.150
100
k
W
RC/RD
Resistor range
4.5
C1 = 0.22
F
0.562
100
k
W
6.0
0.511
100
k
W
1.0
42.20
825
k
W
RS
Resistor range
2.0
C1=0 22
F
9.09
825
k
W
RS
Resistor range
4.5
C1 = 0.22
F
4.22
825
k
W
6.0
3.32
825
k
W
1.0
no limit
pF
C1
Capacitor range
2.0
no limit
F
C1
Ca acitor range
4.5
no limit
pF
6.0
no limit
F
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