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| 型号： | A4940KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 8/14页 |
| 文件大小： | 0K |
| 描述： | IC MOSF DVR FULL BRIDGE 24TSSOP |
| 标准包装： | 1 |
| 配置： | 半桥 |
| 输入类型： | 非反相 |
| 延迟时间： | 35ns |
| 配置数： | 1 |
| 输出数： | 4 |
| 电源电压： | 5.5 V ~ 50 V |
| 工作温度： | -40°C ~ 150°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 供应商设备封装： | 24-TSSOP 裸露焊盘 |
| 包装： | 标准包装 |
| 产品目录页面： | 1141 (CN2011-ZH PDF) |
| 其它名称： | 620-1319-6 |
A4940
Automotive Full Bridge MOSFET Driver
FAULT Pin This is an open drain output fault flag, which indi-
cates a fault condition by its state, as shown in table 2. It must be
pulled to V DD with an external resistor, typically 10 to 47 k Ω .
Fault States
Overtemperature If the junction temperature exceeds the
over-temperature threshold, 170°C typical, the A4940 will enter
the overtemperature fault state and FAULT will go low. The
overtemperature fault state, and FAULT, will only be cleared
when the temperature drops below the recovery level defined by
T JF – T JFHYS .
No circuitry will be disabled. External control circuits must take
action to limit the power dissipation in some way so as to prevent
overtemperature damage to the A4940 chip and unpredictable
device operation.
VREG Undervoltage VREG supplies the low-side gate driver
and the bootstrap charge current. It is critical to ensure that the
voltages are sufficiently high before enabling any of the outputs.
If the voltage at VREG, V REG , drops below the falling VREG
undervoltage lockout threshold, V REGUVOFF , then the A4940
will enter the VREG undervoltage fault state. In this fault state
FAULT will be low, and the outputs will be disabled. The VREG
undervoltage fault state and the fault flags will be cleared when
VREG rises above the rising VREG undervoltage lockout thresh-
old, V REGUVON .
The VREG undervoltage monitor circuit is active during power-
up, and the A4940 remains in the VREG undervoltage fault state
until VREG is greater than the rising VREG undervoltage lockout
threshold, V REGUVON .
Bootstrap Capacitor Undervoltage The A4940 monitors the
voltage across the individual bootstrap capacitors to ensure they
have sufficient charge to supply the current pulse for the high-
Table 2. Fault Definitions
side drive. Before a high-side drive can be turned on, the voltage
across the associated bootstrap capacitor must be higher than the
turn-on voltage limit. If this is not the case, then the A4940 will
start a bootstrap charge cycle by activating the complementary
low-side drive. Under normal circumstances, this will charge the
bootstrap capacitor above the turn-on voltage in a few microsec-
onds and the high-side drive will then be enabled.
The bootstrap voltage monitor remains active while the high-side
drive is active and, if the voltage drops below the turn-off volt-
age, a charge cycle will be initiated.
In either case, if there is a fault that prevents the bootstrap capaci-
tor charging, then the charge cycle will timeout, FAULT will be
low, and the outputs will be disabled. The bootstrap undervoltage
fault state remains latched until RESET is set low.
VDD Undervoltage The logic supply at VDD is monitored
to ensure correct logical operation. If the voltage at VDD, V DD ,
drops below the falling VDD undervoltage lockout threshold,
V DDUVOFF , then the A4940 will enter the VDD undervoltage
fault state. In this fault state, FAULT will be low, and the outputs
will be disabled. In addition, because the state of other reported
faults cannot be guaranteed, all fault states are reset and replaced
by a VDD undervoltage fault state. For example, a VDD under-
voltage will reset an existing boostrap undervoltage fault condi-
tion and replace it with a VDD undervoltage fault. The VDD
undervoltage fault state and the fault flag will be cleared when
V DD rises above the rising VDD undervoltage lockout threshold
defined by V DDUVOFF +V DDUVHYS .
The VDD undervoltage monitor circuit is active during power-up,
and the A4940 remains in the VDD undervoltage fault state until
V DD is greater than the rising VDD undervoltage lockout thresh-
old, V DDUVOFF +V DDUVHYS .
FAULT Pin Setting
High
Low
Low
Low
Low
Fault Description
No Fault
Overtemperature
VDD undervoltage
VREG undervoltage
Bootstrap undervoltage
Disable Outputs*
No
No
Yes
Yes
Yes
Fault Latched
–
No
No
No
Yes
*Yes indicates all gate drives low, and all MOSFETs off.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
8
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