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參數(shù)資料
| 型號(hào)： | UGN5275K |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | COMPLEMENTARY OUTPUT POWER HALL LATCH |
| 中文描述： | 互補(bǔ)輸出功率霍爾鎖存 |
| 文件頁數(shù)： | 3/6頁 |
| 文件大?。?/td> | 98K |
| 代理商： | UGN5275K |
5275
COMPLEMENTARY OUTPUT
POWERHALL
LATCH
SWITCH POINTS VERSUS
TEMPERATURE
APPLICATIONS
The increased current sinking capability of the UGN5275K ideally
suits it for building small, inexpensive brushless dc motors using a
minimum number of external components. Figure 2 shows that the
only components required to commutate motor windings L1 and L2 are
the Hall effect IC, flyback diodes D1 and D2, and one decoupling
capacitor. The remaining components are optional for improving motor
performance. Care should be taken to ensure that the motor winding
impedances are high enough to guarantee that start-up surge currents
do not exceed the maximum rating of the Hall effect IC.
In the circuit shown, diodes D1 and D2 supply a flyback path for
the current of each winding to prevent reactive voltages from exceed-
ing the sustained voltage rating of the Hall-effect IC output transistors.
Zener diode Z1 enables the windings to switch more rapidly by allow-
ing the output voltage to rise above the source voltage, while simulta-
neously clamping the extreme reactive voltages.
The maximum output voltage level will be restricted to the follow-
ing: V
CC
- V
D3
+ V
Z
+ V
D1
(blocking diode D3 voltage drop). Blocking
diode D3 provides reverse input-polarity protection, and should be
used only if reverse battery voltage is a possibility. Capacitor C1
decouples the Hall-effect IC from any high dv/dt transients injected
onto the V
CC
rail to prevent regulator latch-up within the device. Zener
diode Z2 and resistor R1 are required for operation from a V
CC
exceed-
ing 14 V.
FIGURE 2
MOTOR COIL DRIVER
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