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| 型号： | ZL2004ALNNT1 |
| 厂商： | Intersil |
| 文件页数： | 27/42页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK SYNC ADJ 32QFN |
| 标准包装： | 1,000 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | * |
| 占空比： | 95% |
| 电源电压： | 4.5 V ~ 14 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： | -40°C ~ 85°C |
| 封装/外壳： | 32-VFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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ZL2004
This circuit will null out dead-time differences due to
decrease while
maintaining the programmed
component variation, temperature, and loading effects.
This algorithm is independent of application circuit
frequency,
command).
f PROG
(set by the FREQ_SWITCH
parameters such as MOSFET type, gate driver delays,
rise and fall times and circuit layout.
In addition, it does not require drive or MOSFET
voltage or current waveform measurements.
5.13 Adaptive Diode Emulation
Most power converters use synchronous rectification to
optimize efficiency over a wide range of input and
f SW (D)
f PROG
f MIN
output conditions. However, at light loads the
synchronous MOSFET will typically sink current and
introduce additional energy losses associated with
higher peak inductor currents, resulting in reduced
0
D NOM
2
Duty Cycle
D
efficiency. Adaptive diode emulation mode turns off
the low-side FET gate drive at low load currents to
prevent the inductor current from going negative,
reducing the energy losses and increasing overall
efficiency. Diode emulation is available to single-phase
devices only.
Note: the overall bandwidth of the device may be
reduced when in diode emulation mode. It is
recommended that diode emulation is disabled prior to
Figure 16. Adaptive Frequency
Once the GH pulse width (D) reaches 50% of the
nominal duty cycle, D NOM (determined by Vin and
Vout), the switching frequency will start to decrease
according to the following equation:
D NOM
If D then
2
applying significant load steps.
5.14 Adaptive Frequency Control
f SW (D) =
2 ( f SW f MIN )
D NOM
D
f MIN
Since switching losses contribute to the efficiency of
the power converter, reducing the switching frequency
will reduce the switching losses and increase
efficiency. The ZL2004 includes Adaptive Frequency
Control mode, which effectively reduces the observed
switching frequency as the load decreases.
Adaptive frequency mode is enabled by setting bit 0 of
MISC_CONFIG to 1 and is only available while the
device is operating within Adaptive Diode Emulation
Mode. As the load current is decreased, diode
emulation mode decreases the GL on-time to prevent
negative inductor current from flowing. As the load is
decreased further, the GH pulse width will begin to
27
Otherwise f SW (D) = f PROG
This is illustrated in Figure 16. Due to quantizing
effects inside the IC, the ZL2004 will decrease its
frequency in steps between f SW and f MIN . The quantity
and magnitude of the steps will depend on the
difference between f SW and f MIN as well as the
frequency range.
It should be noted that adaptive frequency mode is not
available for current sharing groups and is not allowed
when the device is placed in auto-detect mode and a
clock source is present on the SYNC pin, or if the
device is outputting a clock signal on its SYNC pin.
FN6846.3
February 15, 2011
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ZL2004ALNNT1-01 | 功能描述:IC REG CTRLR BUCK SYNC ADJ 32QFN 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:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:100% 电源电压:8.2 V ~ 30 V 降压:无 升压:无 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:0°C ~ 70°C 封装/外壳:8-DIP（0.300"，7.62mm） 包装:管件 产品目录页面:1316 (CN2011-ZH PDF) |
| ZL2004EVK1 | 功能描述:KIT EVAL FOR ZL2004 RoHS:否 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:* 标准包装:1 系列:- 主要目的:DC/DC，步降 输出及类型:1，非隔离 功率 - 输出:- 输出电压:3.3V 电流 - 输出:3A 输入电压:4.5 V ~ 28 V 稳压器拓扑结构:降压 频率 - 开关:250kHz 板类型:完全填充 已供物品:板 已用 IC / 零件:L7981 其它名称:497-12113STEVAL-ISA094V1-ND |
| ZL2005 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Digital-DC? Integrated Power Management and Conversion IC |
| ZL2005ALNF | 制造商:Intersil Corporation 功能描述:DIGITAL DC-DC CONTROLLER W/ DRIVERS - TRAY100 - Trays 制造商:Intersil Corporation 功能描述:IC REG CNTRLR BUCK PWM 36-QFN 制造商:Intersil Corporation 功能描述:Digital DC-DC Controller w/ Drivers - BULK 50 |
| ZL2005ALNFT | 功能描述:电压模式 PWM 控制器 DIGTL DC-DC CNTRLR W/DRVRS TR100 RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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