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参数资料
| 型号： | A3998SETTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 18/20页 |
| 文件大小： | 0K |
| 描述： | IC MOTOR DRIVER DUAL DMOS QFN |
| 标准包装： | 1 |
| 应用： | 直流电机驱动器，PWM 电机驱动器，步进电机驱动器 |
| 输出数： | 1 或 2 |
| 电流 - 输出： | ±1.5A |
| 电压 - 负载： | 9 V ~ 50 V |
| 电源电压： | 3 V ~ 5.5 V |
| 工作温度： | -20°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-VFQFN 裸露焊盘 |
| 供应商设备封装： | 32-QFN |
| 包装： | 标准包装 |
| 其它名称： | 620-1459-6 |
A3998
Dual DMOS Full Bridge Motor Driver
With Serial Port Control and Dual Regulators
The total resistance from V OUT1 to FB1 to GND should be less
than 10 k Ω .
and
V L(ON) = V BB – I av × R DS(on) – I av × R L – V OUT1
(10)
D1 The Schottky catch diode should be rated to handle 1.2 times
the maximum load current. The voltage rating should be higher
than the maximum input voltage expected during any operating
condition. The duty cycle for high input voltages can be very
close to 100%.
L1 The inductor must be rated to handle the total load current
and the value chosen must keep the ripple current to a reasonable
value. The ripple current, I R , can be calculated by:
Higher inductor values can be chosen to lower the ripple cur-
rent. This may be an option if it is required to increase the total
maximum current available that can be drawn from the switching
regulator. The maximum total current available is:
I LOAD(max) = I CL (min) – I R / 2 (11)
Where I CL (min) is from the Electrical Characteristics table.
COUT1 The output capacitor main consideration is voltage ripple
where
I R = V L(OFF) × (t OFF / L)
(6)
on the output. For electrolytic output capacitors, a low ESR type
is recommended. The peak to peak output ripple is simply:
V L(OFF) = V OUT1 + V f + I av × R L
The switching frequency can then be estimated by:
f PWM = 1 / ( t ON + t OFF )
where
t ON = I R × L / V L(ON)
Table 3. Recommended Components
Configuration
(7)
(8)
(9)
I R(pp) = I R × ESR (12)
Note that the ripple current can be decreased by increasing the
inductor value. The minimum voltage rating of the capacitor is
10 V, however, because ESR decreases with voltage, the most
cost effective choice may be a higher rated voltage.
V OUT2 This output requires a 10 μ F ceramic output capacitor,
COUT2.
Component
Output
f PWM
Symbol
Description
Representative Component
V OUT1x
L1
COUT1
68 μ H
220 μ F / 25 V, ESR = 72 m Ω
3BSumida RCH1216BNP-680K
Rubycon ZL 25ZL220M8x11.5
5V/1A
220 kHz
D1
60 V / 3 A Schottky diode
NSQ03A06
R1
R2
2 k Ω
499 Ω
L1
COUT1
68 μ H
220 μ F / 25 V, ESR = 72 m Ω
4BSumida RCH1216BNP-680K
Rubycon ZL 25ZL220M8x11.5
3.3V/1A
230 kHz
D1
60 V / 3 A Schottky diode
Vishay SS36
V OUT2x
R1
R2
Q1
RSx
COUT2
R3, R4
2 k Ω
866 Ω
External MOSFET - C gs < 1000 pF
Sense resistor
10 μ F /10 V X5R
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
18
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