参数资料
| 型号： | TEA1703TS/N1,115 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 3/15页 |
| 文件大小： | 0K |
| 描述： | IC CTLR SMPS STANDBY 6TSOP |
| 标准包装： | 3,000 |
| 系列： | GreenChip™ |
| 输出隔离： | 隔离 |
| 频率范围： | 24kHz ~ 33kHz |
| 输入电压： | 5 V ~ 30 V |
| 功率（瓦特）： | 500mW |
| 工作温度： | -40°C ~ 150°C |
| 封装/外壳： | SC-74，SOT-457 |
| 供应商设备封装： | 6-TSOP |
| 包装： | 带卷 (TR) |
NXP Semiconductors
TEA1703T
GreenChip SMPS standby control IC
7. Functional description
7.1 General control
The TEA1703T contains a standby controller for switched-mode power supplies. Typical
Typically the TEA1703T senses the output voltage and output power of a switched-mode
power supply. The output voltage is sensed via a resistive divider network connected to
pin VSENSE. The output power is sensed by determining the switching frequency of the
converter using an external filtering network. The converter output power is dependent on
the switching frequency, such as in a discontinuous conduction mode flyback converter
which has a fixed primary peak current during low load operation.
A switching detection input on pin SWDET disables the TEA1703T output when the
primary-side controller is not switching. TEA1753’s pin VINSENSE is used to reset a
latched protection and for standby control. If the TEA1753 is not switching due to latched
protection, the TEA1703T will not activate standby mode. Activating standby mode resets
latched protection.
When configured with the TEA1733, switching detection is only required if the
primary-side V CC (TEA1733 pin 1) is discharged below the latched protection reset level.
In Figure 4 a Zener diode is connected in series with the NPN transistor which discharges
V CC on pin 1. The Zener diode is chosen to keep V CC on pin 1 just below the TEA1733’s
V CC start-up level while the application is in standby mode, guaranteeing a short restart
time. If the Zener diode is omitted, the switching detection input must be connected as
shown in Figure 4 , otherwise pin V CC can be connected via a series resistor to a fixed
voltage.
The TEA1703T has an open-drain optocoupler driver output with an integrated diode to
pin VCC. The optocoupler is efficiently driven in pulse mode which ensures that the
optocoupler ’s Current Transfer Ratio (CTR) remains high; see Section 7.7 and
TEA1703T
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2.3 — 28 April 2011
? NXP B.V. 2011. All rights reserved.
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