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| 型号： | A4934GLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 8/9页 |
| 文件大小： | 0K |
| 描述： | IC BLDC DVR 3PHASE 16-ETSSOP |
| 标准包装： | 1 |
| 应用： | 风扇电机驱动器，3 相 |
| 输出数： | 1 |
| 电流 - 输出： | 500mA |
| 电源电压： | 8 V ~ 16 V |
| 工作温度： | -40°C ~ 105°C |
| 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： | 620-1382-6 |
A4934
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
A4934
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
17 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
0.18 Ω / 0.25 W
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 A4934. If the motor does not produce a proper
BEMF signal at startup when power is applied, a longer setting
may be required.
SLEW Setting
For some motors, soft switching will reduce audible noise. 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.
? Consider the pin-to-pin compatible IC A4941 that allows dis-
abling of the soft switching function.
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, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
7
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