- 您现在的位置：买卖IC网 > PDF目录15515 > ISL8103IRZ-T (Intersil)IC REG CTRLR BUCK PWM VM 40-QFN PDF资料下载
参数资料
| 型号： | ISL8103IRZ-T |
| 厂商： | Intersil |
| 文件页数： | 14/28页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 40-QFN |
| 标准包装： | 1 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1.5MHz |
| 占空比： | 66.6% |
| 电源电压： | 4.75 V ~ 12.6 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： | 40-VFQFN 裸露焊盘 |
| 包装： | 剪切带 (CT) |
| 产品目录页面： | 1244 (CN2011-ZH PDF) |
| 其它名称： | ISL8103IRZ-TCT |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页当前第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页
ISL8103
Advanced Adaptive Zero Shoot-Through Deadtime
VDIFF
Control (Patent Pending)
+
V OFS
-
R 1
VREF
E/A
The integrated drivers incorporate a unique adaptive
deadtime control technique to minimize deadtime, resulting
in high efficiency from the reduced freewheeling time of the
lower MOSFET body-diode conduction, and to prevent the
FB
I OFS
upper and lower MOSFETs from conducting simultaneously.
This is accomplished by ensuring either rising gate turns on
its MOSFET with minimum and sufficient delay after the
other has turned off.
During turn-off of the lower MOSFET, the PHASE voltage is
monitored until it reaches a -0.3V/+0.8V trip point for a
forward/reverse current, at which time the UGATE is
-
1.5V
released to rise. An auto-zero comparator is used to correct
+
+
the r DS(ON) drop in the phase voltage preventing false
R OFS
OFS
GND
ISL8103
-
GND
0.5V
VCC
detection of the -0.3V phase level during r DS(ON) conduction
period. In the case of zero current, the UGATE is released
after 35ns delay of the LGATE dropping below 0.5V. During
the phase detection, the disturbance of LGATE falling
transition on the PHASE node is blanked out to prevent
FIGURE 8. POSITIVE OFFSET OUTPUT VOLTAGE
PROGRAMMING
VDIFF
falsely tripping. Once the PHASE is high, the advanced
adaptive shoot-through circuitry monitors the PHASE and
UGATE voltages during a PWM falling edge and the
subsequent UGATE turn-off. If either the UGATE falls to less
-
V OFS
+
R 1
VREF
E/A
than 1.75V above the PHASE or the PHASE falls to less than
+0.8V, the LGATE is released to turn on.
Internal Bootstrap Device
I OFS
VCC
FB
All three integrated drivers feature an internal bootstrap
schottky diode. Simply adding an external capacitor across
the BOOT and PHASE pins completes the bootstrap circuit.
The bootstrap function is also designed to prevent the
bootstrap capacitor from overcharging due to the large
negative swing at the PHASE node. This reduces voltage
stress on the boot to phase pins.
C BOOT_CAP ≥ --------------------------------------
Δ V BOOT_CAP
R OFS
OFS
ISL8103
+
-
GND
0.5V
-
1.5V
+
VCC
The bootstrap capacitor must have a maximum voltage
rating above PVCC + 5V and its capacitance value can be
chosen from the following equation:
Q GATE
(EQ. 11)
Q GATE = --------------------------------- ? N Q1
FIGURE 9. NEGATIVE OFFSET OUTPUT VOLTAGE
PROGRAMMING
Once the desired output offset voltage has been determined,
use the following formulas to set R OFS :
For Positive Offset (connect R OFS to GND):
Q G1 ? PVCC
V GS1
where Q G1 is the amount of gate charge per upper MOSFET
at V GS1 gate-source voltage and N Q1 is the number of
control MOSFETs. The Δ V BOOT_CAP term is defined as the
R OFS = --------------------------
0.5 ? R 1
V OFFSET
For Negative Offset (connect R OFS to VCC):
(EQ. 9)
allowable droop in the rail of the upper gate drive. Figure 10
shows the boot capacitor ripple voltage as a function of boot
capacitor value and total upper MOSFET gate charge.
R OFS = --------------------------
1.5 ? R 1
V OFFSET
14
(EQ. 10)
FN9246.1
July 21, 2008
相关PDF资料 |
PDF描述 |
|---|---|
| IR3622AMTRPBF | IC REG CTRLR BUCK PWM VM 32MLPQ |
| 4590R-822K | INDUCTOR HIGH CURRENT 8.2UH |
| 4590-822K | INDUCTOR HIGH CURRENT 8.2UH |
| IR3621MTRPBF | IC REG CTRLR BUCK PWM VM 32MLPQ |
| MAX1771CPA+ | IC REG CTRLR BST PWM 8-DIP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL8104 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Synchronous Buck Pulse-Width Modulator (PWM) Controller |
| ISL8104CBZ | 功能描述:IC REG CTRLR BUCK PWM VM 14-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
| ISL8104CBZ-T | 功能描述:IC REG CTRLR BUCK PWM VM 14-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
| ISL8104CRZ | 功能描述:IC REG CTRLR BUCK PWM VM 16-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
| ISL8104CRZ-T | 功能描述:IC REG CTRLR BUCK PWM VM 16-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
发布紧急采购，3分钟左右您将得到回复。