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PDF AN8819 Data sheet ( Hoja de datos )
| Número de pieza | AN8819 | |
| Descripción | 4Ch. Linear Driver IC DC-DC Converter Control for CD | |
| Fabricantes | Panasonic Semiconductor | |
| Logotipo |  |
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ICs for CD/CD-ROM Player
AN8819NFB
4Ch. Linear Driver IC + DC-DC Converter Control for CD
s Overview
The AN8819NFB is a 4ch. driver employing the low
consumption power type H-bridge method which can
operate with low voltage. It is suitable particularly for a
portable CD player.
s Features
• Wide output D-range is available regardless of the ref-
erence voltage on the system
• Driver input/output gain setting enabled by an external
resistance
• For 2 channels, independent power on/off feature built-
in. For other 2 channels, simultaneous on/off feature
provided.
• Thermal shut down circuit (with hysteresis) built-in
• PWM control of the driver supply enabled by an exter-
nal circuit for low consumption power operation
• Construction of DC-DC converter enabled by an exter-
nal circuit
• Construction of ripple filter for D/A converter enabled
by an external capacitor
• Construction of PWM control circuit of laser output by
an external circuit for low consumption power operation
• Reset circuit with a mute and battery voltage detection
circuit built-in for rational design of a set
s Application
Actuator for CD, motor drive
33
34
23 Unit : mm
22
44
1
12
11 0.9±0.1
(0.6)
10.0±0.3
12.2±0.4
44-lead QFP package (QFP044-P-1010)
1 page  
ICs for CD/CD-ROM Player
AN8819NFB
s Pin Description
Pin No. Symbol I/O
Pin Description
Equivalent Circuit
11 SVCC
Supply pin for control circuits
I other than of driver, not connected
with DRVCC, PVCC
11
7 SGND
I
Ground pin for control circuits
other than of driver
7
14 DRVCC
Supply pin for control circuit of
I driver, not connected with SVCC,
PVCC
6 DRGND
I Ground pin for control circuit of
driver
14
6
1 PVCC
Supply pin supplying the current
I for output power transistor
1
27
28
PGND
I
Ground pin for output power
transistor
27
28
2 DED
Setting pin for dead time control
input and soft start
2
SVCC
50kΩ
25kΩ
3 OUT
O Switching output pin
PVCC
3
200Ω
15kΩ
5 Page 
ICs for CD/CD-ROM Player
AN8819NFB
• 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 = CSPRO × VTH/ISPRO (VTH = 1.1V ISPRO = 30µA). (It is recommended that an electrolytic capacitor of 4.7µF
around should be used for Pin3.)
The soft start function works by attaching a capacitor to Pin2 for GND. t = CDED × R (R = 60kΩ)
Also, MAX duty can be changed by attaching an external resistance to Pin2. The output voltage is determined as follows:
(Example)
SVCC Assuming R1 + R2 = 50kΩ
11 1.11V
R1 R3
R1 × R3
R1 + R3
+
R2 × R4
R2 + R4
+
IC Inside
SVCC = 1.1 ×
– R2 × R4
5 R2 + R4
R2 IN R4
FB 4
Where
R3 = 26.9kΩ
R4 = 13.1kΩ
• 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 22µF around is recommended.) Output current : 10mA (typ.)
• Battery Voltage Detection Circuit
The voltage applied to VSEN 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 VSEN pin (Pin10) are as follows:
Detection : VSEN = 2.2V (typ.) BSEL (Pin9) = L
Reset : VSEN = 2.25V (typ.) BSEL (Pin9) = L
Detection : VSEN = 1.8V (typ.) BSEL (Pin9) = HiZ
Reset : VSEN = 1.85V (typ.) BSEL (Pin9) = HiZ
Use the following equation as reference to determine the detection threshold voltage:
VSEN’
R1
VSEN
10
Assuming that the voltage of VSEN (Pin10) at battery
shortage detection is VSEN’
+
–
IC Inside
37
EMP
1.25V
R2
R3
VSEN’ =
R1 + R2 + R3
R3
× 1.25
Where
R1 : External Resistance
R2 : 8.0kΩ
R3 : 16.5kΩ (BSEL = HiZ)
R3 : 10.5kΩ (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.
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet AN8819.PDF ] | |
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