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| 型号： | ISL6745EVAL2Z |
| 厂商： | Intersil |
| 文件页数： | 8/9页 |
| 文件大小： | 0K |
| 描述： | EVALUATION BOARD FOR ISL6745 |
| 标准包装： | 1 |
| 系列： | * |
ISL6745A
variation in dV with R TD (Figure 5), and in charge current
(Figure 4), results from Equation 2 would differ from the
calculated frequency. The typical performance curves may
be used as a tool along with the previous equations as a
more accurate tool to estimate the operating frequency more
accurately.
The maximum duty cycle, D, and deadtime, DT, can be
calculated from:
Overcurrent Operation
Overcurrent delayed shutdown is enabled once the soft-start
cycle is complete. If an overcurrent condition is detected, the
soft-start charging current source is disabled and the
soft-start capacitor is allowed to discharge through a 15μA
source. At the same time a 50μs retriggerable one-shot timer
is activated. It remains active for 50μs after the overcurrent
condition ceases. If the soft-start capacitor discharges to
D = T C ? T OSC
(EQ. 5)
3.9V, the output is disabled. This state continues until the
soft-start voltage reaches 270mV, at which time a new
DT = ( 1 – D ) ? T OSC
Soft-Start Operation
s
(EQ. 6)
soft-start cycle is initiated. If the overcurrent condition stops
at least 50μs prior to the soft-start voltage reaching 3.9V, the
soft-start charging currents revert to normal operation and
the soft-start voltage is allowed to recover.
The ISL6745A features a soft-start using an external
capacitor in conjunction with an internal current source.
Soft-start reduces stresses and surge currents during
start-up.
The oscillator capacitor signal, C T , is compared to the
soft-start voltage, SS, in the SS comparator which drives the
PWM latch. While the SS voltage is less than 3.5V, duty
cycle is limited. The output pulse width increases as the
soft-start capacitor voltage increases up to 3.5V. This has
the effect of increasing the duty cycle from zero to the
maximum pulse width during the soft-start period. When the
soft-start voltage exceeds 3.5V, soft-start is completed.
Soft-start occurs during start-up and after recovery from an
overcurrent shutdown. The soft-start voltage is clamped to 4V.
Gate Drive
The ISL6745A is capable of sourcing and sinking 1A peak
current, and may also be used in conjunction with a
MOSFET driver such as the ISL6700 for level shifting. To
limit the peak current through the IC, an external resistor
may be placed between the totem-pole output of the IC
(OUTA or OUTB pin) and the gate of the MOSFET. This
small series resistor also damps any oscillations caused by
the resonant tank of the parasitic inductances in the traces of
the board and the FET’s input capacitance.
8
Thermal Protection
An internal temperature sensor protects the device should
the junction temperature exceed +145°C. There is
approximately +15°C of hysteresis.
Ground Plane Requirements
Careful layout is essential for satisfactory operation of the
device. A good ground plane must be employed. V DD should
be bypassed directly to GND with good high frequency
capacitance.
FN6703.1
September 11, 2008
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| ISL6745LEVAL2Z | 功能描述:EVAL BOARD 2 FOR ISL6745 RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:* 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| ISL6745UEVAL2Z | 功能描述:EVAL BOARD 2 FOR ISL6745 RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:* 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| ISL6752/54EVAL1Z | 功能描述:BOARD DEMO FOR ISL6752 ISL6754 RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| ISL6752AAZA | 功能描述:IC REG CTRLR PWM CM 16-QSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:75 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.3 V ~ 13.5 V 降压:是 升压:是 回扫:是 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:8-SOIC（0.154"，3.90mm 宽） 包装:管件 产品目录页面:1051 (CN2011-ZH PDF) 其它名称:296-2543-5 |
| ISL6752AAZAR5325 | 制造商:Intersil Corporation 功能描述:- Rail/Tube |
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