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参数资料
| 型号： | ISL6520BCBZ |
| 厂商： | Intersil |
| 文件页数： | 5/10页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 8-SOIC |
| 标准包装： | 98 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 340kHz |
| 占空比： | 100% |
| 电源电压： | 4.5 V ~ 5.5 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： | 0°C ~ 70°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 产品目录页面： | 1243 (CN2011-ZH PDF) |
ISL6520B
rail, which supplies the bias voltage to the ISL6520B. If there
is nowhere for this current to go, such as to other distributed
loads on the V CC rail, through a voltage limiting protection
as close as practical to the BOOT and PHASE pins. All
components used for feedback compensation should be
located as close to the IC a practical.
device, or other methods, the capacitance on the V CC bus
will absorb the current. This situation will allow voltage level
of the V CC rail to increase. If the voltage level of the rail is
boosted to a level that exceeds the maximum voltage rating
of the ISL6520B, then the IC will experience an irreversible
failure and the converter will no longer be operational.
ISL6520B
BOOT
C BOOT
PHASE
VCC
+5V
D 1
+V IN
Q 1
Q 2
L O
C O
V OUT
Ensuring that there is a path for the current to follow other
than the capacitance on the rail will prevent this failure
mode.
Application Guidelines
Layout Considerations
As in any high frequency switching converter, layout is very
important. Switching current from one power device to another
can generate voltage transients across the impedances of the
interconnecting bond wires and circuit traces. These
interconnecting impedances should be minimized by using
wide, short printed circuit traces. The critical components
should be located as close together as possible, using ground
plane construction or single point grounding.
V IN
ISL6520B
C VCC
GND
FIGURE 3. PRINTED CIRCUIT BOARD SMALL SIGNAL
LAYOUT GUIDELINES
Feedback Compensation
Figure 4 highlights the voltage-mode control loop for a
synchronous-rectified buck converter. The output voltage
(V OUT ) is regulated to the Reference voltage level. The
error amplifier (Error Amp) output (V E/A ) is compared with
the oscillator (OSC) triangular wave to provide a
pulse-width modulated (PWM) wave with an amplitude of
V IN at the PHASE node. The PWM wave is smoothed by the
output filter (L O and C O ).
UGATE
PHASE
Q 1
L O
V OUT
OSC
PWM
COMPARATOR
DRIVER
V IN
L O
V OUT
LGATE
Q 2
C IN
C O
Δ V OSC
-
+
DRIVER
PHASE
C O
ESR
Z FB
(PARASITIC)
RETURN
FIGURE 2. PRINTED CIRCUIT BOARD POWER AND
V E/A
-
+
Z IN
GROUND PLANES OR ISLANDS
ERROR
REFERENCE
AMP
Figure 2 shows the critical power components of the converter.
To minimize the voltage overshoot, the interconnecting wires
DETAILED COMPENSATION COMPONENTS
indicated by heavy lines should be part of a ground or power
plane in a printed circuit board. The components shown in
Figure 2 should be located as close together as possible.
Please note that the capacitors C IN and C O may each
C 1
C 2
R 2
Z FB
C 3
Z IN
R 3
V OUT
represent numerous physical capacitors. Locate the ISL6520B
within 3 inches of the MOSFETs, Q 1 and Q 2 . The circuit traces
for the MOSFETs’ gate and source connections from the
COMP/SD
-
FB
R 1
ISL6520B must be sized to handle up to 1A peak current.
Figure 3 shows the circuit traces that require additional
layout consideration. Use single point and ground plane
construction for the circuits shown. Minimize any leakage
current paths on the COMP/SD pin and locate the resistor,
R OSCET close to the COMP/SD pin because the internal
current source is only 20 μ A. Provide local V CC decoupling
between VCC and GND pins. Locate the capacitor, C BOOT
5
+
ISL6520B
REFERENCE
FIGURE 4. VOLTAGE-MODE BUCK CONVERTER
COMPENSATION DESIGN
FN9083.3
July 23, 2007
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6520BCBZ-T | 功能描述:IC REG CTRLR BUCK PWM VM 8-SOIC 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) |
| ISL6520BCR | 功能描述:IC REG CTRLR BUCK PWM VM 16-QFN 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) |
| ISL6520BCR-T | 功能描述:IC REG CTRLR BUCK PWM VM 16-QFN 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) |
| ISL6520BIR | 功能描述:IC REG CTRLR BUCK PWM VM 16-QFN 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) |
| ISL6520BIR-T | 功能描述:IC REG CTRLR BUCK PWM VM 16-QFN 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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