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参数资料
| 型号： | A8583KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 15/33页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 3.5A 16TSSOP |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 0.8V |
| 输入电压： | 4.7 V ~ 36 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 250kHz ~ 2.45MHz |
| 电流 - 输出： | 3.5A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 16-TSSOP-EP |
| 其它名称： | 620-1396-6 |
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A8583
Pulse-by-Pulse Overcurrent Protection (OCP)
The A8583 monitors the current in the upper MOSFET and if the
current exceeds the pulse-by-pulse overcurrent threshold (I LIM )
then the upper MOSFET is turned off. Normal PWM operation
resumes on the next clock pulse from the oscillator. The A8583
includes leading edge blanking to prevent falsely triggering the
pulse-by-pulse current limit when the upper MOSFET is turned
on. Pulse-by-pulse current limiting is always active.
The A8583 is conservatively rated to deliver 3.5 A for most
applications. However, the exact current it can support is heavily
dependent on duty cycle, ambient temperature, thermal resis-
tance of the PCB, airflow, component selection, and nearby heat
sources. The A8583 is designed to deliver more current at lower
duty cycles and slightly less current at higher duty cycles. For
example, the pulse-by-pulse limit at 20% duty cycle is ≥ 4.75 A
but at 80% duty cycle the pulse limit is ≥ 4.10 A. Use table 1 and
figure 8 to determine the real current limit, given the duty cycle
required for each application. Take care to do a careful thermal
solution or thermal shutdown will occur.
Output Short Circuit (Hiccup Mode) Protection
Hiccup mode protects the A8583 when the load is either too high
or when the output of the converter is shorted to ground. When
the voltage at the FB pin is below the Hiccup Enable Thresh-
old (V HICEN , nominally 625 mV), Hiccup mode protection is
enabled. When the voltage at the FB pin is above the Hiccup
V SS
Wide Input Voltage, 2.4 MHz , 3.5 A
Asynchronous Buck Regulator
Disable Threshold (V HICDIS , nominally 750 mV), Hiccup mode
protection is disabled.
Hiccup Mode overcurrent protection monitors the number of
overcurrent events using an up/down counter: an overcurrent
pulse increases the count by one, and a PWM cycle without an
overcurrent pulse decreases the count by one. If the total count
reaches more than 7 (while Hiccup mode is enabled) then the
Hiccup latch is set and PWM switching is stopped. The Hiccup
signal causes the COMP pin to be pulled low with a relatively
low resistance (1500 Ω ). Hiccup mode also enables a current sink
connected to the soft start pin (nominally 10 μ A) so, when Hic-
cup first occurs, the voltage at the soft start pin ramps downward.
Hiccup mode operation is shown in figure 9.
When the voltage at the soft start pin decays to a low level (V SS-
RESET , 235 mV typical), the Hiccup latch is cleared and the 10 μ A
soft start pin current sink is turned off. The soft start pin will
resume charging the soft start capacitor with 20 μ A and the volt-
age at the soft start pin will ramp upward. When the voltage at the
soft start pin exceeds the COMP release threshold (V SSRELEASE ,
330 mV typical), the low resistance pull-down at the COMP pin
will be turned off and the Error amplifier will force the voltage
at the COMP pin to ramp up quickly, and PWM switching will
begin. If the short circuit at the converter output remains, another
Hiccup cycle will occur. Hiccups will repeat until the short circuit
is removed or the converter is disabled. If the short circuit is
removed, the A8583 will soft start normally and the output volt-
age will be ramped to the required level as shown in figure 9.
330 mV
C2
V OUT
235 mV
C1
V COMP
C3
≈ 6.5 A
I L
C4
t
Figure 9. Hiccup mode operation and recovery ; shows V SS (ch1, 200 mV/div.),
V OUT (ch2, 2 V/div.), V COMP (ch3, 1 V/div.), I L (ch4, 5 A/div.), t = 500 μ s/div.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
15
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相关代理商/技术参数 |
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| A8584 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:The A8584 is an adjustable frequency, high output current, PWM regulator that integrates a low resistance, high-side, N-channel MOSFET. |
| A8584KLPTR-T | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:The A8584 is an adjustable frequency, high output current, PWM regulator that integrates a low resistance, high-side, N-channel MOSFET. |
| A8585KLKTR-T | 功能描述:Buck Switching Regulator IC Positive Fixed 5V 1 Output 2A 10-LSOP (0.154", 3.90mm Width) Exposed Pad 制造商:allegro microsystems, llc 系列:汽车级，AEC-Q100 包装:剪切带（CT） 零件状态:有效 功能:降压 输出配置:正 拓扑:降压 输出类型:固定 输出数:1 电压 - 输入（最小值）:4V 电压 - 输入（最大值）:35V 电压 - 输出（最小值/固定）:5V 电压 - 输出（最大值）:- 电流 - 输出:2A 频率 - 开关:300kHz ~ 550kHz 同步整流器:无 工作温度:- 安装类型:表面贴装 封装/外壳:10-LSOP（0.154"，3.90mm 宽）裸焊盘 供应商器件封装:10-SOIC 标准包装:1 |
| A8585KLKTR-T-1 | 功能描述:WIDE INPUT VOLTAGE 2A BUCK REGUL 制造商:allegro microsystems, llc 系列:汽车级，AEC-Q100 包装:带卷（TR） 零件状态:在售 功能:降压 输出配置:正 拓扑:降压 输出类型:固定 输出数:1 电压 - 输入（最小值）:4V 电压 - 输入（最大值）:35V 电压 - 输出（最小值/固定）:3.3V 电压 - 输出（最大值）:- 电流 - 输出:2A 频率 - 开关:300kHz ~ 550kHz 同步整流器:无 工作温度:- 安装类型:表面贴装 封装/外壳:10-LSOP（0.154"，3.90mm 宽）裸露焊盘 供应商器件封装:10-SOIC 标准包装:9,000 |
| A8585KLKTR-T-2 | 功能描述:WIDE INPUT VOLTAGE 2A BUCK REGUL 制造商:allegro microsystems, llc 系列:汽车级，AEC-Q100 包装:带卷（TR） 零件状态:在售 功能:降压 输出配置:正 拓扑:降压 输出类型:固定 输出数:1 电压 - 输入（最小值）:4V 电压 - 输入（最大值）:35V 电压 - 输出（最小值/固定）:5V 电压 - 输出（最大值）:- 电流 - 输出:2A 频率 - 开关:300kHz ~ 550kHz 同步整流器:无 工作温度:- 安装类型:表面贴装 封装/外壳:10-LSOP（0.154"，3.90mm 宽）裸露焊盘 供应商器件封装:10-SOIC 标准包装:9,000 |
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