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参数资料
| 型号： | ISL6527AIR |
| 厂商： | Intersil |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM VM 16-QFN |
| 标准包装： | 60 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 650kHz |
| 占空比： | 100% |
| 电源电压： | 2.97 V ~ 3.63 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： | -40°C ~ 85°C |
| 封装/外壳： | 16-VQFN 裸露焊盘 |
| 包装： | 管件 |
ISL6527, ISL6527A
ISL6527, ISL6527A
VCC
+3.3V VIN
OSC
PWM
COMPARATOR
DRIVER
VIN
LO
VOUT
CVCC
DVOSC
-
+
DRIVER
PHASE
CO
ESR
CPVOUT
ZFB
(PARASITIC)
GND
CBP
D1
CIN
VE/A
-
+
ZIN
BOOT
CBOOT
ERROR
AMP
REFERENCE
Q1
DETAILED COMPENSATION COMPONENTS
UGATE
PHASE
LGATE
PHASE
Q2
LOUT
COUT
VOUT
C2
C1
R2
ZFB
C3
ZIN
R3
VOUT
R1
COMP
COMP
C2
-
FB
FB
R2
C1
R1
ISL6527
+
R4
C3 R3
REFERENCE
FIGURE 5. VOLTAGE-MODE BUCK CONVERTER
KEY
ISLAND ON POWER PLANE LAYER
ISLAND ON CIRCUIT PLANE LAYER
VIA CONNECTION TO GROUND PLANE
FIGURE 4. PRINTED CIRCUIT BOARD POWER PLANES
AND ISLANDS
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 .
COMPENSATION DESIGN
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 first zero below filter’s double pole (~75% F LC ).
3. Place second zero at filter ’s double-pole.
4. Place first pole at the ESR zero.
5. Place second pole at half the switching frequency.
6. Check gain against error amplifier ’s open-loop gain.
7. Estimate phase margin; repeat if necessary.
Compensation Break Frequency Equations
F Z1 = ----------------------------------
F LC = ------------------------------------------
2 π x L O x C O
F ESR = -------------------------------------------
F P1 = ---------------------------------------------------------
2 π x R 2 x ? ---------------------- ?
F Z2 = -------------------------------------------------------
F P2 = ------------------------------------
Modulator Break Frequency Equations
1
(EQ. 5)
1
2 π x ESR x C O
(EQ. 6)
The compensation network consists of the error amplifier
(internal to the ISL6527, ISL6527A) and the impedance
networks Z IN and Z FB . The goal of the compensation
1
2 π × R 2 × C 2
1
? C 1 x C 2 ?
? C 1 + C 2 ?
1
2 π x ( R 1 + R 3 ) x C 3
1
2 π x R 3 x C 3
(EQ. 7)
(EQ. 8)
(EQ. 9)
(EQ. 10)
network is to provide a closed loop transfer function with the
highest 0dB crossing frequency (f 0dB ) and adequate phase
margin. Phase margin is the difference between the closed
loop phase at f 0dB and 180°. Equations 7 through 10 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 5. Use
10
Figure 6 shows an asymptotic plot of the DC/DC converter’s
gain vs frequency. The actual modulator gain has a high gain
peak due to the high Q factor of the output filter and is not
shown in Figure 6. Using the above guidelines should give a
compensation gain similar to the curve plotted. The open loop
FN9056.10
November 18, 2008
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6527AIR-T | 功能描述:IC REG CTRLR BST 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) |
| ISL6527AIRZ | 功能描述:电压模式 PWM 控制器 600KHZ SNG PWM CONTR LR W/EXT. REF. 16LD 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 |
| ISL6527AIRZ-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) |
| ISL6527CB | 功能描述:电压模式 PWM 控制器 Single Synch Buck 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 |
| ISL6527CB-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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