- 您现在的位置：买卖IC网 > PDF目录69007 > LTC3736-2EUF#TRPBF (LINEAR TECHNOLOGY CORP) SWITCHING CONTROLLER, PQCC24 PDF资料下载
参数资料
| 型号： | LTC3736-2EUF#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, PQCC24 |
| 封装： | 4 X 4 MM, LEAD FREE, PLASTIC, QFN-24 |
| 文件页数： | 4/28页 |
| 文件大小： | 344K |
| 代理商： | LTC3736-2EUF#TRPBF |
第1页第2页第3页当前第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
LTC3736-2
12
37362fb
Peak Current Sense Voltage Selection and Slope
Compensation (IPRG1 and IPRG2 Pins)
When a controller is operating below 20% duty cycle, the
peak current sense voltage (between the SENSE+ and SW
pins) allowed across the external P-channel MOSFET is
determined by:
Δ
= ()
V
AV
V
SENSE MAX
ITH
()
–.
07
10
where A is a constant determined by the state of the IPRG
pins. Floating the IPRG pin selects A = 1.875; tying IPRG
to VIN selects A = 2.7; tying IPRG to SGND selects A = 1.3.
The maximum value of VITH is typically about 1.98V, so
the maximum sense voltage allowed across the external
P-channel MOSFET is 240mV, 345mV, or 167mV for the
three respective states of the IPRG pin. The peak sense
voltages for the two controllers can be independently
selected by the IPRG1 and IPRG2 pins.
However, once the controller’s duty cycle exceeds 20%,
slope compensation begins and effectively reduces the
peak sense voltage by a scale factor given by the curve
in Figure 1.
The peak inductor current is determined by the peak sense
voltage and the on-resistance of the external P-channel
MOSFET:
I
V
R
PK
SENSE MAX
DS ON
=
Δ
()
Power Good (PGOOD) Pin
A window comparator monitors both feedback voltages
and the open-drain PGOOD output pin is pulled low when
either or both feedback voltages are not within ±10% of the
0.6V reference voltage. PGOOD is low when the LTC3736-2
is shut down or in undervoltage lockout.
2-Phase Operation
Why the need for 2-phase operation? Until recently,
constant-frequency dual switching regulators operated
both controllers in phase (i.e., single-phase operation).
This means that both topside MOSFETs (P-channel) are
turned on at the same time, causing current pulses of up
to twice the amplitude of those from a single regulator to
be drawn from the input capacitor. These large amplitude
pulses increase the total RMS current owing in the input
capacitor, requiring the use of larger and more expensive
input capacitors, and increase both EMI and power losses
in the input capacitor and input power supply.
With 2-phase operation, the two controllers of the LTC3736-2
are operated 180 degrees out-of-phase. This effectively
interleaves the current pulses coming from the topside
MOSFET switches, greatly reducing the time where they
overlap and add together. The result is a signicant reduc-
tion in the total RMS current, which in turn allows the
use of smaller, less expensive input capacitors, reduces
shielding requirements for EMI and improves real world
operating efciency.
OPERATION
Figure 1. Maximum Peak Current vs Duty Cycle
DUTY CYCLE (%)
10
SF
=
I/I
MAX
(%)
60
80
110
100
90
37362 F01
40
20
50
70
90
30
10
0
30
50
70
20
0
40
60
80
100
(Refer to Functional Diagram)
相关PDF资料 |
PDF描述 |
|---|---|
| LTC3736-2EGN#PBF | SWITCHING CONTROLLER, PDSO24 |
| LTC3785EUF-1#TRPBF | 3 A SWITCHING REGULATOR, 650 kHz SWITCHING FREQ-MAX, PQCC24 |
| LTC3785EUF-1#PBF | 3 A SWITCHING REGULATOR, 650 kHz SWITCHING FREQ-MAX, PQCC24 |
| LTC3823EUH | 4 A SWITCHING CONTROLLER, 200 kHz SWITCHING FREQ-MAX, PQCC32 |
| LTC3823EGN | 4 A SWITCHING CONTROLLER, 200 kHz SWITCHING FREQ-MAX, PDSO28 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3736EGN | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 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:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3736EGN#PBF | 功能描述:IC REG CTRLR BUCK 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:PolyPhase® 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 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:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
| LTC3736EGN#TR | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 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:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3736EGN#TRPBF | 功能描述:IC REG CTRLR BUCK 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:PolyPhase® 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:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3736EGN-1 | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 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。