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参数资料
| 型号： | ISL6223CAZA-T |
| 厂商： | Intersil |
| 文件页数： | 6/15页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 20-SSOP |
| 标准包装： | 2,500 |
| PWM 型： | 控制器 |
| 输出数： | 2 |
| 频率 - 最大： | 305kHz |
| 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： | 20-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
R IN
FB
ISL6223
V IN
ERROR
AMPLIFIER
COMPARATOR
Q1
L 01
-
+
CORRECTION
∑
+
-
-
+
PWM
CIRCUIT
PWM1
HIP6601
Q2
I L1
PROGRAMMABLE
REFERENCE
DAC
-
∑
+
CURRENT
SENSING
I SEN1
R ISEN1
PHASE
I AVERAGE
CURRENT
AVERAGING
V CORE
-
∑
+
CURRENT
SENSING
I SEN2
R ISEN2
V IN
C OUT
R LOAD
-
-
+
∑
CORRECTION
COMPARATOR
+
PWM
CIRCUIT
PWM2
HIP6601
Q3
PHASE
L 02
I L2
Q4
FIGURE 1. SIMPLIFIED BLOCK DIAGRAM OF THE ISL6223 VOLTAGE AND CURRENT CONTROL LOOPS FOR A TWO POWER
CHANNEL REGULATOR
Operation
Figure 1 shows a simplified diagram of the voltage regulation
and current control loops. Both voltage and current feedback
are used to precisely regulate voltage and tightly control
output currents, I L1 and I L2 , of the two power channels. The
voltage loop comprises the Error Amplifier, Comparators,
gate drivers and output MOSFETs. The Error Amplifier is
essentially connected as a voltage follower that has an input,
the Programmable Reference DAC and an output that is the
CORE voltage.
Voltage Loop
Feedback from the CORE voltage is applied via resistor R IN
to the inverting input of the Error Amplifier. This signal can
drive the Error Amplifier output either high or low, depending
upon the CORE voltage. Low CORE voltage makes the
amplifier output move towards a higher output voltage level.
Amplifier output voltage is applied to the positive inputs of
the Comparators via the Correction summing networks. Out-
of-phase sawtooth signals are applied to the two
Comparators inverting inputs. Increasing Error Amplifier
voltage results in increased Comparator output duty cycle.
6
This increased duty cycle signal is passed through the PWM
CIRCUIT with no phase reversal and on to the HIP6601,
again with no phase reversal for gate drive to the upper
MOSFETs, Q1 and Q3. Increased duty cycle or ON time for
the MOSFET transistors results in increased output voltage
to compensate for the low output voltage sensed.
Current Loop
The current control loop works in a similar fashion to the
voltage control loop, but with current control information
applied individually to each channel’s Comparator. The
information used for this control is the voltage that is
developed across r DS(ON) of each lower MOSFET, Q2 and
Q4, when they are conducting. A single resistor converts and
scales the voltage across the MOSFETs to a current that is
applied to the Current Sensing circuit within the ISL6223.
Output from these sensing circuits is applied to the current
averaging circuit. Each PWM channel receives the
difference current signal from the summing circuit that
compares the average sensed current to the individual
channel current. When a power channel’s current is greater
than the average current, the signal applied via the summing
Correction circuit to the Comparator, reduces the output
FN9013.3
July 9, 2008
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6223EVAL1 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Mobile Microprocessor CORE Voltage Regulator Multi-Phase Buck PWM Controller |
| ISL6223EVAL2 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Mobile Microprocessor CORE Voltage Regulator Multi-Phase Buck PWM Controller |
| ISL6224 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Single Output Mobile-Friendly PWM Controller |
| ISL6224_06 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Single Output Mobile-Friendly PWM Controller |
| ISL6224CA | 功能描述:电流型 PWM 控制器 Mobile-Friendly RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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