- 您现在的位置：买卖IC网 > PDF目录69503 > TPS23756PWP (TEXAS INSTRUMENTS INC) 1.1 A SWITCHING CONTROLLER, 278 kHz SWITCHING FREQ-MAX, PDSO20 PDF资料下载
参数资料
| 型号： | TPS23756PWP |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.1 A SWITCHING CONTROLLER, 278 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封装： | GREEN, PLASTIC, HTSSOP-20 |
| 文件页数： | 24/41页 |
| 文件大小： | 1405K |
| 代理商： | TPS23756PWP |
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页当前第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页第41页
VC1
VC2
CUVH
RECHARGE
VC
(C
+ C
)
V
(10 F + 0.47 F)
6.5 V
T
=
= 17 m s
I
4 mA
m
VC1
VC2
CUVH
DISCHARGE
TOTAL
(C
+ C
)
V
(10 F + 0.47 F)
6.5V
T
=
= 8.08 ms
I
8.42 m A
m
DISCHARGE
RECHARGE
T
8.08 ms
Duty Cycle: D =
=
= 32%
T
+ T
8.08 ms + 17 ms
DISCHARGE
RECHARGE
1
Hiccup Frequency: F =
=
= 39.9 Hz
T
+ T
8.08 ms + 17 ms
D
VC1
C
V
C
ARTN
R
VC
V
C
T1
BiasWinding
V
C
T2P From
TPS23754
R
T2P
R
T2P_OUT
Type2PSE
Indicator
V
OUT
Low= T2
TPS23754
TPS23754-1
TPS23756
SLVS885D – OCTOBER 2008 – REVISED DECEMBER 2009
www.ti.com
(a)
(b)
(a) Note that the optocoupler current is 0 mA because the output is in current limit.
(b) Also, it is assumed IT2P is 0 mA.
(c)
(d)
6. With the TPS23754, the voltage rating of CVC1 and CVC2 should be 25 V minimum while with the TPS23756
the rating can be 16 V.
Switching Transformer Considerations and RVC
Care in design of the transformer and VC bias circuit is required to obtain hiccup overload protection.
Leading-edge voltage overshoot on the bias winding may cause VC to peak-charge, preventing the expected
tracking with output voltage. Some method of controlling this is usually required. This may be as simple as a
series resistor, or an R-C filter in front of DVC1. Good transformer bias-to-output-winding coupling results in
reduced overshoot and better voltage tracking.
RVC as shown in Figure 32 helps to reduce peak charging from the bias winding. This becomes especially
important when tuning hiccup mode operation during output overload. Typical values for RVC will be between 10
and 100 .
Figure 32. RVC Usage
T2P Pin Interface
The T2P pin is an active low, open-drain output indicating a high power source is available. An optocoupler is
typically used to interface with the T2P pin to signal equipment on the secondary side of the converter of T2P
status. Optocoupler current-gain is referred to as CTR (current transfer ratio), which is the ratio of transistor
collector current to LED current. To preserve efficiency, a high-gain optocoupler ( 250%
≤ CTR ≤ 500%, or 300%
≤ CTR ≤ 600% ) along with a high-impedance (e.g., CMOS) receiver are recommended. Design of the T2P
optocoupler interface can be accomplished as follows:
Figure 33. T2P Interface
1. T2P ON characteristic: IT2P = 2 mA minimum, VT2P = 1 V
2. Let VC = 12 V, VOUT = 5 V, RT2P-OUT = 10 k, VT2P-OUT (low) = 400 mV max
30
Copyright 2008–2009, Texas Instruments Incorporated
相关PDF资料 |
PDF描述 |
|---|---|
| TPS23754PWP | 1.1 A SWITCHING CONTROLLER, 278 kHz SWITCHING FREQ-MAX, PDSO20 |
| TPS2375PWG4 | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| TPS2376PWR | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| TPS2375DRG4 | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| TPS2375DG4 | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS23756PWPR | 功能描述:热插拔功率分布 Hi Pwr Eff PoE Inter face & DC/DC Cntrlr RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| TPS23757EVM | 功能描述:电源管理IC开发工具 TPS23757 Eval Mod RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| TPS23757PW | 功能描述:热插拔功率分布 Hi Eff PoE Inter & DC/DC Controller RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| TPS23757PWR | 功能描述:热插拔功率分布 Hi Eff PoE Interface & DC/DC Controller RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| TPS2375D | 功能描述:热插拔功率分布 IEEE 802.3af PoE Pwr Device Cntrler RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
发布紧急采购，3分钟左右您将得到回复。