参数资料
| 型号： | ISL6236AIRZ-T |
| 厂商： | Intersil |
| 文件页数： | 32/37页 |
| 文件大小： | 0K |
| 描述： | IC MAIN PWR CTRLR QUAD 32-QFN |
| 产品培训模块： | Solutions for Industrial Control Applications |
| 标准包装： | 6,000 |
| 应用： | 控制器，笔记本电脑电源系统 |
| 输入电压： | 4.5 V ~ 25 V |
| 输出数： | 4 |
| 输出电压： | 多重 |
| 工作温度： | -40°C ~ 100°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-VFQFN 裸露焊盘 |
| 供应商设备封装： | 32-QFN 裸露焊盘（5x5） |
| 包装： | 带卷 (TR) |
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ISL6236A
R 1 = R 2 ? ? ?
? V OUT1 ?
? V FB1 ?
Adjustable-Output Feedback (Dual-Mode FB)
Connect FB1 to GND to enable the fixed 5V or tie FB1 to
VCC to set the fixed 1.5V output. Connect a resistive
voltage-divider at FB1 between OUT1 and GND to adjust the
respective output voltage between 0.7V and 5.5V (see
Figure 77). Choose R 2 to be approximately 10k and solve for
R 1 using Equation 6.
------------------- – 1
(EQ. 6)
where V FB1 = 0.7V nominal.
Likewise, connect REFIN2 to VCC to enable the fixed 3.3V
or tie REFIN2 to VREF3 to set the fixed 1.05V output. Set
condition. The minimum practical inductor value is one
that causes the circuit to operate at critical conduction
(where the inductor current just touches zero with every
cycle at maximum load). Inductor values lower than this
grant no further size-reduction benefit.
The ISL6236A pulse-skipping algorithm (SKIP = GND)
initiates skip mode at the critical conduction point, so the
inductor's operating point also determines the load
current at which PWM/PFM switchover occurs. The
optimum LIR point is usually found between 25% and
50% ripple current.
V IN
REFIN2 from 0V to 2.50V for SMPS2 tracking mode (see
Figure 78).
UGATE1
Q 3
OUT1
R 3 = R 4 ? ? ------------------- – 1 ?
? V ?
where:
VR
OUT2
(EQ. 7)
ISL6236A
LGATE1
Q 4
? VR = 2V nominal (if tied to REF)
or
OUT1
R 1
? VR = 3.3V nominal (if tied to VREF3)
Design Procedure
Establish the input voltage range and maximum load current
before choosing an inductor and its associated ripple current
ratio (LIR). The following four factors dictate the rest of the
design:
1. Input Voltage Range. The maximum value (V IN(MAX) )
must accommodate the maximum AC adapter voltage.
The minimum value (V IN(MIN) ) must account for the
FB1
R 2
FIGURE 77. SETTING V OUT1 WITH A RESISTOR DIVIDER
V IN
UGATE2
UGATE
LGATE2
lowest input voltage after drops due to connectors, fuses
and battery selector switches. Lower input voltages result
in better efficiency.
2. Maximum Load Current. The peak load current
(I LOAD(MAX) ) determines the instantaneous component
stress and filtering requirements and thus drives output
capacitor selection, inductor saturation rating and the
design of the current-limit circuit. The continuous load
current (I LOAD ) determines the thermal stress and drives
the selection of input capacitors, MOSFETs and other
critical heat-contributing components.
3. Switching Frequency. This choice determines the basic
trade-off between size and efficiency. The optimal
frequency is largely a function of maximum input voltage
and MOSFET switching losses.
4. Inductor Ripple Current Ratio (LIR). LIR is the ratio of
UGATE2
ISL88733
ISL88732
ISL6236A
ISL88734
LGATE2
OUT2
VOUT OUT2
FB
REFIN2 REFIN2
R 4
Q1
Q 2
R 3
VR
OUT2
the peak-peak ripple current to the average inductor
current. Size and efficiency trade-offs must be
considered when setting the inductor ripple current ratio.
Low inductor values cause large ripple currents, resulting
in the smallest size, but poor efficiency and high output
noise. Also, total output ripple above 3.5% of the output
regulation will cause controller to trigger out-of-bound
32
FIGURE 78. SETTING V OUT2 WITH A VOLTAGE DIVIDER FOR
TRACKING
FN6453.3
March 18, 2008
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6236EVAL1 | 功能描述:EVAL BOARD 1 FOR ISL6236 RoHS:否 类别:编程器，开发系统 >> 评估板 - 线性稳压器 (LDO) 系列:* 产品变化通告:1Q2012 Discontinuation 30/Mar/2012 设计资源:NCP590MNDPTAGEVB Gerber Files 标准包装:1 系列:- 每 IC 通道数:2 - 双 输出电压:1.8V，2.8V 电流 - 输出:300mA 输入电压:2.1 ~ 5.5 V 稳压器类型:正，固定式 工作温度:-40°C ~ 85°C 板类型:完全填充 已供物品:板 已用 IC / 零件:NCP590MNDP 其它名称:NCP590MNDPTAGEVB-NDNCP590MNDPTAGEVBOS |
| ISL6236EVAL2 | 功能描述:EVAL BOARD 2 FOR ISL6236 RoHS:否 类别:编程器，开发系统 >> 评估板 - 线性稳压器 (LDO) 系列:* 产品变化通告:1Q2012 Discontinuation 30/Mar/2012 设计资源:NCP590MNDPTAGEVB Gerber Files 标准包装:1 系列:- 每 IC 通道数:2 - 双 输出电压:1.8V，2.8V 电流 - 输出:300mA 输入电压:2.1 ~ 5.5 V 稳压器类型:正，固定式 工作温度:-40°C ~ 85°C 板类型:完全填充 已供物品:板 已用 IC / 零件:NCP590MNDP 其它名称:NCP590MNDPTAGEVB-NDNCP590MNDPTAGEVBOS |
| ISL6236IRZA | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:High-Efficiency, Quad-Output, Main Power Supply Controllers for Notebook Computers |
| ISL6236IRZAR5281 | 功能描述:IC MAIN PWR CTRLR QUAD 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| ISL6236IRZA-T | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:High-Efficiency, Quad-Output, Main Power Supply Controllers for Notebook Computers |
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