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参数资料
| 型号： | ISL6522BCR-T |
| 厂商： | Intersil |
| 文件页数： | 7/15页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM VM 16-QFN |
| 标准包装： | 6,000 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 占空比： | 100% |
| 电源电压： | 10.8 V ~ 13.2 V |
| 降压： | 是 |
| 升压： | 是 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 16-VQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
ISL6522B
Functional Description
Initialization
The ISL6522B automatically initializes upon receipt of
power. Special sequencing of the input supplies is not
necessary. The Power-On Reset (POR) function continually
monitors the input supply voltages and the enable (EN) pin.
The POR monitors the bias voltage at the VCC pin and the
VOLTAGE
V SOFT START
V OUT
input voltage (V IN ) on the OCSET pin. The level on OCSET
is equal to V IN Less a fixed voltage drop (see overcurrent
protection). With the EN pin held to V CC , the POR function
initiates soft-start operation after both input supply voltages
V OSC(MIN)
CLAMP ON V COMP
V COMP
exceed their POR thresholds. For operation with a single
RELEASED AT STEADY STATE
+12V power source, V IN and V CC are equivalent and the
+12V power source must exceed the rising V CC threshold
before POR initiates operation.
t 0
t 1
t 2
TIME
t 1 = ----------- ? V OSC ( MIN )
C SS V OUT SteadyState
t SoftStart = t 2 – t 1 = ----------- ? ? ? V OSC
The POR function inhibits operation with the chip disabled
(EN pin low). With both input supplies above their POR
thresholds, transitioning the EN pin high initiates a soft-start
interval.
C SS
I SS
I SS V IN
------------------------------------------------
Soft-Start
The POR function initiates the soft-start sequence. An
internal 10 μ A current source charges an external capacitor
(C SS ) on the SS pin to 4V. Soft-start clamps the error
amplifier output (COMP pin) to the SS pin voltage. Figure 3
shows the soft-start interval. At t 1 in Figure 3, the SS and
COMP voltages reach the valley of the oscillator ’s triangle
wave. The oscillator ’s triangular waveform is compared to
the ramping error amplifier voltage. This generates PHASE
pulses of increasing width that charge the output
capacitor(s). This interval of increasing pulse width
continues to t2, at which point the output is in regulation and
the clamp on the COMP pin is released. This method
provides a rapid and controlled output voltage rise.
During Soft-Start, the ISL6522B controls the regulator in a
standard buck fashion. The lower MOSFET is not enabled
during soft-start. The body diode of the MOSFET or the
external diode, if used, will conduct when the upper
MOSFET is OFF. Once the output has reached regulation,
the lower MOSFET is enabled and the regulator is controlled
as a synchronous buck regulator. This allows the ISL6522B
regulator to start into a pre-biased output.
Where:
4V
2V
0V
15A
10A
5A
0A
C SS = Soft Start Capacitor
I SS = Soft Start Current = 10 μ A
V OSC(MIN) = Bottom of Oscillator = 1.35V
V IN = Input Voltage
? V OSC = Peak to Peak Oscillator Voltage = 1.9V
V OUTSteadyState = Steady State Output Voltage
FIGURE 3. SOFT-START INTERVAL
During Soft Start, the ISL6522B functions as a standard buck
converter by disabling the lower MOSFET. This is done by
holding the LGATE pin LOW. If there is not a diode in parallel
with the lower MOSFET, the body diode of the lower
MOSFET will conduct when the upper MOSFET is off. Once
the SS pin has reached it’s peak value, the lower MOSFET
is enabled and the ISL6522B functions as a synchronous
buck converter.
7
TIME (20ms/DIV)
FIGURE 4. OVERCURRENT OPERATION
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6522BCRZ | 功能描述:IC REG CTRLR BST PWM VM 16-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
| ISL6522BCRZ-T | 功能描述:IC REG CTRLR BST PWM VM 16-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
| ISL6522BEVAL1 | 功能描述:EVAL BOARD 1 FOR ISL6522B RoHS:否 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:* 标准包装:1 系列:- 主要目的:DC/DC，步降 输出及类型:1，非隔离 功率 - 输出:- 输出电压:3.3V 电流 - 输出:3A 输入电压:4.5 V ~ 28 V 稳压器拓扑结构:降压 频率 - 开关:250kHz 板类型:完全填充 已供物品:板 已用 IC / 零件:L7981 其它名称:497-12113STEVAL-ISA094V1-ND |
| ISL6522BIB | 功能描述:IC REG CTRLR BST PWM VM 14-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| ISL6522BIB-T | 功能描述:IC REG CTRLR BST PWM VM 14-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
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