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PDF FAN8048 Data sheet ( Hoja de datos )
| Número de pieza | FAN8048 | |
| Descripción | 2 DC-DC Converter & 4-CH PWM Motor IC | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de FAN8048 (archivo pdf) en la parte inferior de esta página. Total 34 Páginas | ||
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FAN8048
2 DC-DC Converter & 4-CH PWM Motor IC
Features
H-Bridge PWM Driver
• 4 Channels direct PWM H-bridge drivers
• Digital input and direct PWM output
• Internal power switches
- ON state resistance : 2.0 Ω (typ.), which value added
the upper and the lower switches
Synchronous DC-DC Converter
• Built-in step up converter (VG converter)
• Built-in two synchronous step up-down converter
• Built-in short circuit protection
• Internal Switches
- Power Switch : 0.4Ω (typ.) at 500mA
-. Synchronous-Rectifier Switch : 0.4Ω (typ.) at 500mA
Others
• Built-in power-on reset circuit
• Built-in battery charge circuit
• Built-in voltage regulator control circuit
• Built-in thermal shutdown (TSD) circuit
• Buit-in channel mute circuit
Typical application
• Portable CD-MP3 player
Descripation
The FAN8048 is a monolithic integrated circuit suitable for a
4 channels direct PWM H-bridge driver which incorporates
two switch-mode step up-down converter with synchronous
rectification provides local microprocessor and servo IC
power in portable CD players and portable devices.
48-LQFP-0707
Ordering Information
Device
Package
FAN8048 48-LQFP-0707
Operating Temp.
-30°C ~ +85°C
©2004 Fairchild Semiconductor Corporation
Rev. 1.0.0
1 page  
Internal Block Diagram
LG
PGND
CH1+ CH1-
CH2+ CH2-
PVCC
CH3+ CH3-
48 47 46 45
44 43
42 41 40
H-Bridge 1
H-Bridge 2
H-Bridge 3
FAN8048
CH4+
39
CH4-
38
PGND
37
VG 1
VSYS1
VIN VSYS2
RST 2
0.5V
VSYS1
OFF 3
ON 4
SPRT 5
SGND 6
PCT 7
SYSTEM
Control
SYSTEM OFF
SYSTEM ON
OSC
D
R
V
PRE-DRIVER
CH4F
CH4R
CH3R
CH3F
CH2R
CH2F
CH1R
3-State
Input
Control
CH1F
36 CH4F
35 CH4R
34 CH3F
33 CH3R
32 CH2F
31 CH2R
30 CH1
29 MUTE
28 DGND
CLK 8
SOFT 9
EA1O 10
EA1- 11
0.9V
EA2O 12
STEP UP/DOWN
CONVERTER 2
Driver & Logic
STEP UP/DOWN
CONVERTER 1
Driver & Logic
Battery
Charger
Switch
27 CHGSW
26 CHGCON
25 CHGSEN
Regulator
0.9V & Current
Control
13
14
15
16
DSW2
17 18
EAI2- VSYS2 USW2 PGND
VIN
19 20 21 22
DSW1 PGND USW1 VSYS1
23 24
REG
DCIN
5
5 Page 
FAN8048
1-4. Power-On Reset (POR) Function
FAN8048 has two DC-DC converters to supply stable power to external circuits and components of the CD player set.
Therefore, for these output voltages of DC-DC converters to provide stable power to external circuits and their components,
the DC input voltage,VIN, and the output voltages of converter, VSYS1 and VSYS2, monitoring function is required.
The DC input voltage, VIN, and the output voltage of converter2 are individually divided by the internal resistors and then
compared with the internal 0.5V reference voltage, VREF2, to determine the low voltages condition.
This power on reset (POR) circuit is shown in Figure2.
VSYS2 14
VIN 18
VSYS1
VSYS1 22
Vref2
2 RST
RST
Figure 2. Block Diagram of Power On Reset
1-5. Power Sequence
The following graph and flowchart of Figure 3 and Figure 4 show the power sequence of the VG converter and two DC-DC
converters (DC-DC converter1 and DC-DC Converter2); herein, VG converter generates power for internal circuits and upper
side output power switches of the 4 channels H-bridge driver, and the DC-DC converters supply the external circuits and com-
ponents.
Voltage
VG=7.0V
3.9V
1.35V
Hysteresis
Converter 1 Converter 2 Reset Signal
Wake-up Wake-up
Figure 3. Plot of Power Sequence
VSYS1
VRST
VSYS2
t
11
11 Page | ||
| Páginas | Total 34 Páginas | |
| PDF Descargar | [ Datasheet FAN8048.PDF ] | |
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