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| 型号： | ISL6520ACBZA-T |
| 厂商： | Intersil |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 8-SOIC |
| 标准包装： | 2,500 |
| 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： | 带卷 (TR) |
ISL6520A
ISL6520A
V IN
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
RETURN
V E/A
Z FB
(PARASITIC)
+
FIGURE 3. PRINTED CIRCUIT BOARD POWER AND
GROUND PLANES OR ISLANDS
Figure 3 shows the critical power components of the converter.
-
ERROR
AMP
Z IN
REFERENCE
To minimize the voltage overshoot, the interconnecting wires
indicated by heavy lines should be part of a ground or power
DETAILED COMPENSATION COMPONENTS
plane in a printed circuit board. The components shown in
Figure 3 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 ISL6520A
within 3 inches of the MOSFETs, Q 1 and Q 2 . The circuit traces
for the MOSFETs’ gate and source connections from the
ISL6520A must be sized to handle up to 1A peak current.
Figure 4 shows the circuit traces that require additional
layout consideration. Use single point and ground plane
construction for the circuits shown. Minimize any leakage
COMP
-
+
ISL6520A
REFERENCE
FB
R 1
current paths on the COMP/OCSET pin and locate the
resistor, R OSCET close to the COMP/OCSET pin because
the internal current source is only 20μA. Provide local V CC
decoupling between VCC and GND pins. Locate the
capacitor, C BOOT 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.
FIGURE 5. VOLTAGE-MODE BUCK CONVERTER
COMPENSATION DESIGN
The modulator transfer function is the small-signal transfer
function of V OUT /V E/A . This function is dominated by a DC
Gain and the output filter (L O and C O ), with a double pole
break frequency at F LC and a zero at F ESR . The DC Gain of
the modulator is simply the input voltage (V IN ) divided by the
peak-to-peak oscillator voltage Δ V OSC .
F LC = -------------------------------------------
F ESR = --------------------------------------------
+5V
ISL6520A
BOOT
C BOOT
PHASE
VCC
+5V
D 1
+V IN
Q 1
Q 2
L O
C O
V OUT
Modulator Break Frequency Equations
1 1
2 π x LO x CO 2 π x ESR x C O
(EQ. 4)
The compensation network consists of the error amplifier
COMP/OCSET
GND
C VCC
(internal to the ISL6520A) and the impedance networks Z IN
and Z FB . The goal of the compensation network is to provide
a closed loop transfer function with the highest 0dB crossing
frequency (f 0dB ) and adequate phase margin. Phase margin
FIGURE 4. PRINTED CIRCUIT BOARD SMALL SIGNAL
LAYOUT GUIDELINES
Feedback Compensation
Figure 5 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
7
is the difference between the closed loop phase at f 0dB and
180 degrees. The following equations relate the
compensation network’s poles, zeros and gain to the
components (R 1 , R 2 , R 3 , C 1 , C 2 , and C 3 ) in Figure 7. Use
these guidelines for locating the poles and zeros of the
compensation network:
1. Pick Gain (R 2 /R 1 ) for desired converter bandwidth.
2. Place 1 ST Zero Below Filter’s Double Pole (~75% F LC ).
3. Place 2 ND Zero at Filter ’s Double Pole.
FN9016.6
December 10, 2009
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6520ACBZA-TS2490 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
| ISL6520ACBZ-T | 功能描述:电压模式 PWM 控制器 VER OF ISL6520ACB-T RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| ISL6520ACR | 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) |
| ISL6520ACR-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) |
| ISL6520AIB | 功能描述:IC REG CTRLR BUCK PWM VM 8-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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