参数资料
| 型号： | ISL6237IRZ-T |
| 厂商： | Intersil |
| 文件页数： | 30/35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： | 5.5 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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ISL6237
TABLE 4. SHUTDOWN AND STANDBY CONTROL LOGIS
VEN_LDO
LOW
“>2.5” → HIGH
“>2.5” → HIGH
“>2.5” → HIGH
“>2.5” → HIGH
“>2.5” → HIGH
“>2.5” → HIGH
VEN1 (V)
LOW
LOW
HIGH
HIGH
LOW
HIGH
REF
VEN2 (V)
LOW
LOW
HIGH
LOW
HIGH
REF
HIGH
LDO
OFF
ON
ON
ON
ON
ON
ON
SMPS1
OFF
OFF
ON
ON
OFF
ON
ON (AFTER SMPS2 IS UP)
SMPS2
OFF
OFF
ON
OFF
ON
ON (AFTER SMPS1 IS UP)
ON
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
(Figure 72). Choose R 2 to be approximately 10k and solve
for R 1 using Equation 5.
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 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
R 1 = R 2 ? ? ------------------- – 1 ?
? V OUT1 ?
? V FB1 ?
(EQ. 5)
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
where V FB1 = 0.7V nominal.
Likewise, connect REFIN2 to VCC to enable the fixed 3.3V
or tie REFIN2 to a 3.3V supply to set the fixed 1.05V output.
Set REFIN2 from 0 to 2.50V for SMPS2 tracking mode
(Figure 73).
regulation will cause controller to trigger out-of-bound
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.
R3 = R4 ? ? ------------------- – 1 ?
? V ?
VR
OUT2
where:
? VR = 2V nominal (if tied to REF)
Design Procedure
(EQ. 6)
The ISL6237 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
Establish the input voltage range and maximum load current
UGATE_
UGATE1
ISL6237
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
lowest input voltage after drops due to connectors, fuses
and battery selector switches. Lower input voltages result
in better efficiency.
UGATE1
ISL6237
LGATE1 LGATE1
ISL88732
ISL88733
ISL88734
LGATE_
OUT1
VOUT_ OUT1
Q 3
Q 4
R 1
OUT1
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.
30
FB_
FB1 FB1
R 2
FIGURE 72. SETTING V OUT1 WITH A RESISTOR DIVIDER
FN6418.4
March 18, 2008
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