- 您现在的位置：买卖IC网 > PDF目录30771 > LTC3862HFE#PBF (LINEAR TECHNOLOGY CORP) DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO24 PDF资料下载
参数资料
| 型号： | LTC3862HFE#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封装： | 4.40 MM, LEAD FREE, PLASTIC, TSSOP-24 |
| 文件页数： | 13/40页 |
| 文件大小： | 613K |
| 代理商： | LTC3862HFE#PBF |
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页当前第13页第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页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页
LTC3862
20
3862fb
OPERATION
Figure 12. Effect of Slope Gain on the Peak SENSE Threshold
the slope compensation is too low the converter can
suffer from excessive jitter or, worst case, sub-harmonic
oscillation. When excess slope compensation is applied to
the internal current sense signal, the phase margin of the
control loop suffers. Figure 11 illustrates inductor current
waveforms for a properly compensated loop.
The LTC3862 contains a patented circuit whereby most
of the applied slope compensation is recovered, in order
to provide a SENSE+ to SENSE– threshold which is not
a strong function of the duty cycle. This sense threshold
is, however, a function of the programmed slope gain, as
shown in Figure 12. The data sheet typical specication of
75mV for SENSE+ minus SENSE– is measured at a normal-
ized slope gain of 1.00 at low duty cycle. For applications
where the normalized slope gain is not 1.00, use Figure 12
to determine the correct value of the sense resistor.
Programmable Blanking and the Minimum On-Time
The BLANK pin on the LTC3862 allows the user to program
the amount of leading edge blanking at the SENSE pins.
Connecting the BLANK pin to SGND results in a minimum
on-time of 180ns, oating the pin increases this time to
260ns, and connecting the BLANK pin to the 3V8 supply
results in a minimum on-time of 340ns. The majority
of the minimum on-time consists of this leading edge
blanking, due to the inherently low propagation delay
of the current comparator (25ns typ) and logic circuitry
(10ns to 15ns).
The purpose of leading edge blanking is to lter out noise on
the SENSE pins at the leading edge of the power MOSFET
turn-on. During the turn-on of the power MOSFET the gate
drive current, the discharge of any parasitic capacitance
on the SW node, the recovery of the boost diode charge,
and parasitic series inductance in the high di/dt path all
contribute to overshoot and high frequency noise that
could cause false-tripping of the current comparator. Due
to the wide range of applications the LTC3862 is well-suited
to, xing one value of the internal leading edge blanking
time would have required the longest delay time to have
been used. Providing a means to program the blank time
allows users to optimize the SENSE pin ltering for each
application. Figure 13 illustrates the effect of the program-
mable leading edge blank time on the minimum on-time
of a boost converter.
Programmable Maximum Duty Cycle
In order to maintain constant frequency and a low output
ripple voltage, a single-ended boost (or yback or SEPIC)
converter is required to turn off the switch every cycle
for some minimum amount of time. This off-time allows
the transfer of energy from the inductor to the output
capacitor and load, and prevents excessive ripple current
and voltage. For inductor-based topologies like boost and
SEPIC converters, having a maximum duty cycle as close
as possible to 100% may be desirable, especially in low
VIN to high VOUT applications. However, for transformer-
based solutions, having a maximum duty cycle near 100%
is undesirable, due to the need for V sec reset during the
primary switch off-time.
DUTY CYCLE (%)
50
MAXIMUM
CURRENT
SENSE
THRESHOLD
(mV)
60
70
80
55
65
75
20
40
60
80
3862 F12
100
10
0
30507090
SLOPE = 0.625
SLOPE = 1.66
SLOPE = 1
Figure 11. Inductor Current Waveforms for a
Properly Compensated Control Loop
ILOAD
2A/DIV
200mA-3A
IL1
2A/DIV
IL2
2A/DIV
VOUT
2V/DIV
10μs/DIV
3862 F11
VIN = 24V
VOUT = 48V
相关PDF资料 |
PDF描述 |
|---|---|
| LTC3862EGN#TRPBF | DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO24 |
| LTC3862IUH#PBF | DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC24 |
| LTC3862EGN#PBF | DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO24 |
| LTC3862EUH#TRPBF | DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC24 |
| LTC3862HGN#TRPBF | DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO24 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3862HGN#PBF | 功能描述:IC REG CTRLR BST PWM CM 24-SSOP 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:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 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 ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC3862HGN#TRPBF | 功能描述:IC REG CTRLR BST PWM CM 24-SSOP 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:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 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 ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC3862HGN-1#PBF | 功能描述:IC REG CTRLR BST PWM CM 24-SSOP 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:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 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 ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC3862HGN-1#TRPBF | 功能描述:IC REG CTRLR BST PWM CM 24-SSOP 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:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 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 ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC3862HGN-2#PBF | 功能描述:IC REG CTRLR BST PWM CM 24-SSOP 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:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 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 ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
发布紧急采购，3分钟左右您将得到回复。