参数资料
| 型号： | TEA1752LT/N1,518 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 19/34页 |
| 文件大小： | 0K |
| 描述： | IC CTLR SMPS SW MODE 16SOIC |
| 标准包装： | 1 |
| 输出隔离： | 隔离 |
| 输入电压： | 14 V ~ 38 V |
| 功率（瓦特）： | 600mW |
| 工作温度： | -40°C ~ 150°C |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SO |
| 包装： | 标准包装 |
| 其它名称： | 568-5962-6 |
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NXP Semiconductors
TEA1752T; TEA1752LT
GreenChip III SMPS control IC
An internal current source charges the capacitor to V = I start(soft)fb × R SS2 , with a maximum
of approximately 0.63 V.
The start level and the time constant of the increasing primary current level can be
externally adjusted by changing the values of R SS2 and C SS2 .
τ softstart = 3 × R SS2 × C SS2
The soft start current I start(soft)fb is switched on when V CC reaches V startup . When the
voltage on pin FBSENSE has reached 0.63 V the flyback converter starts switching.
The charging current I start(soft)PFC flows if voltage on pin FBSENSE is below approximately
0.63 V. If the voltage on pin FBSENSE exceeds 0.63 V, the soft start current source limits
the current. Once the flyback converter has started, the soft start current source is
switched off.
S2
3 μ A I start(soft)fb ≤ 60 μ A
SOFT START
CONTROL
RSS2
10
FBSENSE
ocp level
OCP
CSS2
RSENSE2
014aaa748
Fig 15. Soft start-up of flyback
7.3.7 Maximum on-time
The flyback controller limits the ‘on-time’ of the external MOSFET to 40 μ s (typical). When
the ‘on-time’ is longer than 40 μ s, the IC stops switching and enters the safe restart mode.
7.3.8 Overvoltage protection (FBAUX pin)
An output overvoltage protection is implemented in the GreenChip III series. This
operates for the TEA1752(L)T by sensing the auxiliary voltage via the current flowing into
pin FBAUX during the secondary stroke. The auxiliary winding voltage is a well defined
replica of the output voltage. Voltage spikes are averaged by an internal filter.
If the output voltage exceeds the OVP trip level, an internal counter starts counting
subsequent OVP events. The counter has been added to prevent incorrect OVP detection
which might occur during ESD or lightning events. If the output voltage exceeds the OVP
trip level a few times and then not again in a subsequent cycle, the internal counter counts
down at twice the speed it uses when counting up. However, when typically eight cycles of
subsequent OVP events are detected, the IC assumes a true OVP and the OVP circuit
switches the power MOSFET off. As the protection is latched, the converter only restarts
after the internal latch is reset. In a typical application the mains should be interrupted to
reset the internal latch.
TEA1752T_LT
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 02 — 24 June 2010
? NXP B.V. 2010. All rights reserved.
19 of 34
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TEA1752T | 制造商:未知厂家 制造商全称:未知厂家 功能描述:The TEA1752T and TEA1752LT combine a controller for Power Factor Correction (PFC) and a flyback controller. |
| TEA1752T/1791/DB/90W,598 | 制造商:NXP Semiconductors 功能描述:- Boxed Product (Development Kits) 制造商:NXP Semiconductors 功能描述:90W notebook adapter Ref |
| TEA1752T/N1,518 | 功能描述:DC/DC 开关控制器 IC CTLR SMPS SW MODE RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TEA1753 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:The GreenChip III is the third generation of green Switched Mode Power Supply (SMPS) controller ICs. |
| TEA1753LT/N1,518 | 功能描述:DC/DC 开关控制器 GreenChip III SMPS control IC RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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