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PDF AM4961 Data sheet ( Hoja de datos )
| Número de pieza | AM4961 | |
| Descripción | SINGLE PHASE FULL WAVE DIRECT PWM MOTOR DRIVER | |
| Fabricantes | BCD | |
| Logotipo |  |
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Data Sheet
SINGLE PHASE FULL WAVE DIRECT PWM MOTOR DRIVER
General Description
Features
AM4961
The AM4961 is a full wave driver IC with PWM con- · Built-in Hall Bias Circuit
trol function. It is used for single phase motor and is · Built-in PWM Speed Control Circuit
capable of speed control by changing output duty · Built-in Minimal Speed Setup Circuit
cycle.
· Rotation Speed Indication (FG)
www.DataSheet4U.Tcohme AM4961 is available in TSSOP-20(EDP) and
HTSSOP-14 packages.
·
·
Rotation or Lock State Indication (RD)
Built-in Thermal Shutdown Circuit
· Lock Protection
· Output Current Limit
Application
· CPU Cooler Fan in PC
· Brushless DC Motor Driver
TSSOP-20(EDP)
HTSSOP-14
Figure 1. Package Types of AM4961
Jun. 2008 Rev. 2. 2
BCD Semiconductor Manufacturing Limited
1
1 page  
SINGLE PHASE FULL WAVE DIRECT PWM MOTOR DRIVER
Functional Block Diagram
Data Sheet
AM4961
COSC
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VPWM
VMIN
8 (5)
7 (4)
6 (3)
Oscillation Circuit
VREF
14 (11) Voltage
Reference
Thermal Shutdown
Pre-driver
12 (9)
HB Hall Bias
HIN+
HIN-
11 (8)
13 (10)
Control
Circuit
Hysteresis Amp
Lock Shutdown
and
Auto Restart
15 (12)
16 (13)
CT GND
A (B)
A for 20-pin
B for 14-pin
1, 2, 3, 18,
19, 20
PGND
Figure 3. Functional Block Diagram of AM4961
9 (6)
FG
10 (7)
RD
5 (2)
VCC
4 (1)
OUT2
17 (14)
OUT1
Jun. 2008 Rev. 2. 2
BCD Semiconductor Manufacturing Limited
5
5 Page 
SINGLE PHASE FULL WAVE DIRECT PWM MOTOR DRIVER
Operating Diagram
VPWM adjustable Voltage
Lowest speed setting voltage
fOSC=25kHz (COSC=100pF)
VMIN Voltage
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COSC Output
Data Sheet
AM4961
Vosc
Vosc
VCC
0V
FG Output
Low Speed
PWM Variable
High Speed
Figure 10. Operating Diagram of AM4961 (Note 6)
Note 6:
1. Low Speed Setting Mode
When VPWM voltage is higher than VMIN pin voltage,
motor speed is settable by VMIN pin voltage. The mini-
mum drive duty cycle is settable by comparing COSC
oscillating voltage and VMIN pin voltage.
VPWM voltage is decided by variation of PWM duty.
2. Variable Speed Setting Mode
When VPWM voltage is lower than VMIN pin voltage,
PWM control system works by comparing VPWM voltage
and COSC voltage. If VPWM voltage is higher, the ON
duty cycle of the upper side transistors will be minimized
and motor speed becomes lower. Vice versa.
3. Full Speed Rotation Mode
At a certain PWN duty, when VPWM voltage is lower than
the low side of COSC output voltage, the motor will run at
full speed.
Jun. 2008 Rev. 2. 2
BCD Semiconductor Manufacturing Limited
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet AM4961.PDF ] | |
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