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参数资料
| 型号： | A4941GLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 7/9页 |
| 文件大小： | 0K |
| 描述： | IC MOTOR DRIVER 3PH 16-TSSOP |
| 标准包装： | 1 |
| 系列： | * |
| 应用： | * |
| 输出数： | * |
| 电流 - 输出： | * |
| 电压 - 负载： | * |
| 电源电压： | * |
| 工作温度： | * |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 供应商设备封装： | 16-TSSOP-EP |
| 包装： | 标准包装 |
| 其它名称： | 620-1357-6 |
A4941
Three-Phase Sensorless Fan Driver
Application Information
M
Name
Typical Value
Description
C3
V BB
V BB
R2
C2
1 OUTC
2 CP1
3 CP2
4 VCP
5 GND
6 SLEW
7 PWM
8 FG
A4941
PAD
CTAP
OUTB 16
OUTA 15
SENSE 14
VBB 13
CTAP 12
GND 11
FC 10
TEST 9
R1
C1
CTAP
V BB
D2
D1
C1
C2,C3
R2
D1
D2
10 μ F / 25 V
0.1 μ F / 25 V
10 k Ω
>1.5 A rated
15 V
VBB supply capacitor, minimum 10 μ F,
electrolytic can be used
Charge pump ceramic capacitors
FG pull-up resistor, can be pulled-up to
V BB if required
Optional blocking diode for supply reverse
polarity protection
Transient voltage suppressor (TVS)
Typical Application Circuit; speed adjusted via VBB
R1
0.167 Ω
Current limiting sense resistor, required for
low resistance motors
Startup Oscillator Setting (FC)
Typically, the 50 ms setting is optimum for motors appropriate
for use with the A4941. If the motor does not produce a proper
BEMF signal at startup when power is applied, a longer setting
may be required.
SLEW Setting
Connect SLEW to ground to enable the soft switching func-
tion. For some motors, soft switching may reduce audible noise.
Enabling the soft switching function can result in motor stall for
some motors, specifically motors with large inductance that run at
higher speeds. For this situation, there are two potential solutions:
? Limit the motor speed by lowering the maximum demand, by
reducing either V motor (max) or the PWM duty applied.
? Disable soft switching by leaving SLEW pin open circuit.
Current Limiting
Use of the current limit circuit is not required. If motor resistance
(phase-to-phase) will limit the current below the rating in the
Absolute Maximum table, then simply connect the SENSE pin to
ground. That is:
? If (V BB (max) / R motor ) < 1.25 A, eliminate R S .
? If (V BB (max) / R motor ) > I OUT (max), the choice of R S deter-
mines the current limit setting; recommended range is
167 m Ω < R S < 250 m Ω .
Note: For some motor types, use of the current limit circuit may
prevent proper startup due to the effect of the chopping on the
BEMF voltage appearing on the tri-stated winding.
Layout Notes
? Connect GND pins (5,11) to exposed pad ground area under
package.
? Add thermal vias from exposed pad to bottom side ground
plane.
? Place V BB decoupling capacitor as close to the IC as possible.
? Place sense resistor, (if used), as close to the IC as possible.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
7
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