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参数资料
| 型号： | ISL6307ACRZ-T |
| 厂商： | Intersil |
| 文件页数： | 14/33页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 48-QFN |
| 标准包装： | 4,000 |
| PWM 型： | 电压模式 |
| 输出数： | 6 |
| 频率 - 最大： | 275kHz |
| 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： | 0°C ~ 70°C |
| 封装/外壳： | 48-VFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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ISL6307A
PWM signal will remain high until the pulse termination
pass through the DCR. Equation 3 shows the s-domain
signal marks the beginning of the next cycle by triggering the
PWM signal low.
Current Sampling
equivalent voltage across the inductor V L .
V L = I L ? ( s ? L + DCR )
(EQ. 3)
During the forced off-time following a PWM transition low,
the associated channel current sense amplifier uses the
ISEN inputs to reproduce a signal proportional to the
inductor current, I L . This current gets sampled starting 1/6
period after each PWM goes low and continuously gets
A simple R-C network across the inductor extracts the DCR
voltage, as shown in Figure 4.
The voltage on the capacitor V C , can be shown to be
proportional to the channel current I L , see Equation 4.
? s ? ------------- + 1 ? ? ( DCR ? I )
V C = ---------------------------------------------------------------------
sampled for 1/3 period, or until the PWM goes high,
whichever comes first. No matter the current sense method,
the sense current, I SEN , is simply a scaled version of the
inductor current. Coincident with the falling edge of the PWM
? DCR ? L
L
( s ? RC + 1 )
(EQ. 4)
signal, the sample and hold circuitry samples the sensed
current signal I SEN , as illustrated in Figure 3.
Therefore, the sample current, I n , is proportional to the
output current and held for one switching cycle. The sample
current is used for current balance, load-line regulation, and
If the R-C network components are selected such that the
RC time constant (= R*C) matches the inductor time
constant (= L/DCR), the voltage across the capacitor V C is
equal to the voltage drop across the DCR, i.e. proportional to
the channel current.
overcurrent protection.
V IN
IL ( s )
DCR
PWM
I L
I SEN
ISL6609
PWM(n)
ISL6307A INTERNAL CIRCUIT
L
INDUCTOR
V L
V C (s)
R
C
V OUT
C OUT
R ISEN(n)
0.5Tsw
SAMPLE CURRENT, I n
SWITCHING PERIOD
I n
SAMPLE
&
HOLD
+
ISEN-(n)
(PTC)
I SEN = I ------------------
L R
TIME
FIGURE 3. SAMPLE AND HOLD TIMING
Current Sensing
The ISL6307A supports inductor DCR sensing, MOSFET
R DS(ON) sensing, or resistive sensing techniques. The
internal circuitry, shown in Figures 4, 5, and 6, represents
one channel of an N-channel converter. This circuitry is
repeated for each channel in the converter, but may not be
active depending on the status of the PWM3 and PWM4
pins, as described in the PWM Operation section.
INDUCTOR DCR Sensing
An inductor ’s winding is characteristic of a distributed
resistance as measured by the DCR (Direct Current
Resistance) parameter. Consider the inductor DCR as a
-
ISEN+(n)
DCR
ISEN
FIGURE 4. DCR SENSING CONFIGURATION
With the internal low-offset current amplifier, the capacitor
voltage V C is replicated across the sense resistor R ISEN .
Therefore the current out of ISEN+ pin, I SEN , is proportional
to the inductor current.
Equation 5 shows that the ratio of the channel current to the
sensed current I SEN is driven by the value of the sense
resistor and the DCR of the inductor.
I SEN = I L ? ------------------
separate lumped quantity, as shown in Figure 4. The
channel current I L , flowing through the inductor, will also
14
DCR
R ISEN
(EQ. 5)
FN9236.0
February 6, 2006
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相关代理商/技术参数 |
参数描述 |
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| ISL6307AIRZ | 功能描述:IC REG CTRLR BUCK PWM VM 48-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) |
| ISL6307AIRZ-T | 功能描述:IC REG CTRLR BUCK PWM VM 48-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) |
| ISL6307BCRZ | 功能描述:软开关 PWM 控制器 W/ANNEAL 6-PHS VR11 CNTRLR COM RoHS:否 制造商:Fairchild Semiconductor 输出端数量: 输出电流: 开关频率: 工作电源电压:30 V 电源电流: 最大工作温度:+ 105 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| ISL6307BCRZ-T | 功能描述:软开关 PWM 控制器 W/ANNEAL 6-PHS VR11 CNTRLR COM TAPE AND RoHS:否 制造商:Fairchild Semiconductor 输出端数量: 输出电流: 开关频率: 工作电源电压:30 V 电源电流: 最大工作温度:+ 105 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| ISL6307BIRZ | 功能描述:软开关 PWM 控制器 W/ANNEAL 6-PHS VR11 CNTRLR INDUSTRIAL RoHS:否 制造商:Fairchild Semiconductor 输出端数量: 输出电流: 开关频率: 工作电源电压:30 V 电源电流: 最大工作温度:+ 105 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
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