参数资料
型号: ISL8120IRZEC
厂商: Intersil
文件页数: 25/33页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM VM 32-QFN
标准包装: 60
PWM 型: 电压模式
输出数: 2
频率 - 最大: 1.5MHz
占空比: 90%
电源电压: 3 V ~ 22 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 32-VFQFN 裸露焊盘
包装: 管件
ISL8120IR
Current Loop
When the ISL8120IRZEC operates in 2-phase mode, the
current control loop keeps the channel’s current in balance.
After 175ns blanking period with respect to the falling edge
where IL is the inductor DC current, and DCR is its DC
resistance.
For low-side MOSFET r DS(ON) sensing, the ICS can be
derived from Equation 3:
IL ? r DS ( ON )
of the PWM pulse of each channel, the voltage developed
across the DCR of the inductor, r DS(ON) of the low-side
MOSFETs, or a precision resistor, is filtered and sampled for
ICS = ----------------------------------
RISEN
(EQ. 3)
IL ? DCR
ICS = -------------------------
ICS1 + ICS2
IAVG = -----------------------------------
175ns. The current (I CS1 /I CS2 ) is scaled by the R ISEN
resistor and provides feedback proportional to the average
output current of each channel.
For DCR sensing, the ICS can be derived from Equation 2:
(EQ. 2)
RISEN
In multiphase mode (VSEN2- pulled high), the scaled output
currents from both active channels are combined to create
an average current reference (I AVG ) which represents
average current of both channel outputs as calculated in
Equation 4.
(EQ. 4)
2
VOUT
IOUT1
DCR SENSING
PHASE1
VOUT
IOUT1
r DS(ON) SENSING
PHASE1
PHASE2
IOUT2
VOUT
L1
C
DCR1
R
L1
DCR1
DCR2
R
L2
C
R ISEN1
R ISEN1
ISEN1B
VCC
ISEN1A
DCR1
ISEN1B
ISEN1A
ISEN2A
DCR2
AMP
ISEN2B
R ISEN2
700mV
AMP
I CS1
I CS2
VSEN2-
+
-
+
VSEN2+
ISHARE
E/A
I AVG_CS +15μA
CURRENT
SHARE
CHANNEL 1
PWM CONTROL
BLOCK
CHANNEL 1
CURRENT
CORRECTION
BLOCK
-
I CSH_ERR
I AVG_CS
+
2
I AVG
+
-
-
CHANNEL 2
CURRENT
CORRECTION
BLOCK
CHANNEL 2
PWM CONTROL
BLOCK
BLOCK
ISET
R ISET
I AVG_CS +15μA
1.2V
AVG_OC
COMP
CHANNEL 1
SOFT-START AND
FAULT LOGIC
I TRIP =105μA
OC2
COMP
7 CYCLES
DELAY
CHANNEL 2
SOFT-START AND
FAULT LOGIC
V ISHARE
7 CYCLES
DELAY
OC1
COMP
I TRIP = 105μA
I AVG = (I CS1 + I CS2 )/2
I AVG_CS = I AVG or I CS1
I CSH_ERR = (V ISARE - V ISET )/G CS
FIGURE 13. SIMPLIFIED CURRENT SAMPLING AND OVERCURRENT PROTECTION
25
FN6763.2
November 11, 2011
相关PDF资料
PDF描述
ISL8120IRZ IC REG CTRLR BUCK PWM VM 32-QFN
ISL8121IRZ IC REG CTRLR BUCK PWM VM 24-QFN
ISL8126IRZ IC REG CTRLR BUCK PWM VM 32-QFN
ISL8130IAZ IC REG CTRLR BST FLYBK VM 20QSOP
ISL85001IRZ-T IC REG BUCK ADJ 1A 12DFN
相关代理商/技术参数
参数描述
ISL8120IRZ-T 功能描述:IC REG CTRLR BUCK PWM VM 32-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)
ISL8120IRZ-TEC 功能描述:IC REG CTRLR BUCK PWM VM 32-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)
ISL8120IRZ-TK 功能描述:IC REG CTRLR BUCK PWM VM 32-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)
ISL8121 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:3V to 20V, Two-Phase Buck PWM Controller with Integrated 4A MOSFET Drivers
ISL8121EVAL1 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:3V to 20V, Two-Phase Buck PWM Controller with Integrated 4A MOSFET Drivers