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參數(shù)資料
| 型號： | AN8819 |
| 廠商： | Panasonic Corporation |
| 元件分類： | DC/DC變換器 |
| 英文描述： | 4Ch. Linear Driver IC DC-DC Converter Control for CD |
| 中文描述： | 4通道。線性驅(qū)動器IC的DC - DC轉(zhuǎn)換器控制的CD |
| 文件頁數(shù)： | 11/11頁 |
| 文件大?。?/td> | 116K |
| 代理商： | AN8819 |
ICs for CD/CD-ROM Player
AN8819NFB
R2
R3
IC Inside
10
–
+
37
1.25V
EMP
V
SEN
’
R1
V
SEN
–
+
4
11
5
SV
CC
R1
R2
IN
R3
R4
1.11V
FB
DC-DC Converter Portion
3.4V regulator can be constructed by using external components. The output voltage can be made variable by using an external
resistance.
The short-circuit protective function stops switching of OUT pin (Pin3), unless the output of error amplifier (Pin4) reaches L
after H, within t = C
SPRO
×
V
TH
/I
SPRO
(V
TH
= 1.1V I
SPRO
= 30
μ
A). (It is recommended that an electrolytic capacitor of 4.7
μ
F
around should be used for Pin3.)
The soft start function works by attaching a capacitor to Pin2 for GND. t = C
DED
×
R (R = 60k
)
Also, MAX duty can be changed by attaching an external resistance to Pin2. The output voltage is determined as follows:
(Example)
Assuming R1 + R2 = 50k
R1
×
×
R4
R1 R3 + R2
SV
CC
= 1.1
×
R2
×
R4
R2 + R4
Where
R3 = 26.9k
R4 = 13.1k
Ripple Filter Portion for DA Converter (Ripple Filter of Low Saturation Voltage Type)
Attach a capacitor for noise removal to CRIP pin for GND.
(A capacitor of 22
μ
F around is recommended.) Output current : 10mA (typ.)
Battery Voltage Detection Circuit
The voltage applied to V
SEN
pin (Pin10) and the constant voltage are compared for output to EMP pin (Pin37).
There is approx. 50mV of hysteresis from detection to reset to prevent the output chattering.
The detection threshold voltage can be made variable by an external resistance.
The threshold values with no external resistances at V
SEN
pin (Pin10) are as follows:
Detection : V
SEN
= 2.2V (typ.) BSEL (Pin9) = L
Reset : V
SEN
= 2.25V (typ.) BSEL (Pin9) = L
Detection : V
SEN
= 1.8V (typ.) BSEL (Pin9) = HiZ
Reset : V
SEN
= 1.85V (typ.) BSEL (Pin9) = HiZ
Use the following equation as reference to determine the detection threshold voltage:
Assuming that the voltage of V
SEN
(Pin10) at battery
shortage detection is V
SEN
’
V
SEN
’ = R1 +R3
×
1.25
Where R1 : External Resistance
R2 : 8.0k
R3 : 16.5k
(BSEL = HiZ)
R3 : 10.5k
(BSEL = L)
RESET and MRST Portions
RESET (Pin35) is changed from L to H, and MRST pin is changed from H to L, with approx. 90% of the output voltage by a DC-
DC converter.
IC Inside
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AN8819NFB | 制造商:PANASONIC 制造商全稱:Panasonic Semiconductor 功能描述:4Ch. Linear Driver IC DC-DC Converter Control for CD |
| AN8825NFHQ-V | 制造商:Panasonic Industrial Company 功能描述:IC |
| AN8826 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:16-Bit LED Driver 中文資料 |
| AN8835SB | 制造商:Panasonic Industrial Company 功能描述:IC |
| AN8835SBE1 | 制造商:Panasonic Industrial Company 功能描述:IC |
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