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| 型号： | TEA1762T/N2,118 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 5/15页 |
| 文件大小： | 82K |
| 描述： | IC CTRLR GREENCHIP SYNC 14-SOIC |
| 标准包装： | 2,500 |
| 系列： | GreenChip™ |
| 模式： | 间歇导电（DCM） |
| 电源电压： | 8.6 V ~ 38 V |
| 工作温度： | -20°C ~ 150°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 14-SO |
| 包装： | 带卷 (TR) |
| 其它名称： | 935283651118 |
TEA1762T_2
?NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 02 25 April 2007
5 of 15
NXP Semiconductors
TEA1762T
GreenChip synchronous rectier controller
7.3 SMPS output voltage and current regulation
The output voltage of the yback Switched Mode Power Supply (SMPS) can be controlled
by sensing the output voltage via the VSENSE pin. The feedback loop via the primary
controller can regulate the output voltage of the switched mode power supply by
regulating the voltage on the VSENSE pin to 2.5 V above the voltage on pin SENSEGND.
Also the output current of the yback SMPS can be controlled or limited. The voltage on
the ISENSE pin is regulated or limited to 50 mV above the voltage on pin POWERGND.
7.4 Opto outputs
The opto output is intended to drive an opto coupler (see
Figure
5). The opto outputs have
an open drain output conguration. The maximum sink current is internally limited to 5 mA
(typical). The outputs are linearly controlled via the VSENSE and ISENSE input pins. An
over-temperature situation will switch the protection opto output (OPTOPROT) to its
maximum sink current.
During start-up (V
CC
< V
startup
) and undervoltage lock-out the outputs are disabled.
7.5 Protection input
The PROTECT pin is a general purpose input pin which can be used for additional
protection of the switched mode power supply. With a Negative Temperature Coefcient
(NTC) thermistor external temperature protection can be provided, e.g. the external power
switches and transformer can be protected against high temperatures. With a Zener diode
a secondary overvoltage protection can be made.
7.6 Reference voltage output
The reference voltage output pin can be used for supplying external circuitry. The
maximum output current must be limited to 1 mA.
The reference voltage is activated as soon as the start-up voltage is reached on the V
CC
pin and switched off again after the V
CC
pin voltage drops below the V
CC
stop level.
7.7 Supply management
All (internal) reference voltages are derived from a temperature compensated, on-chip
band gap circuit. The reference voltage is trimmed to an accuracy within 1 %.
7.8 OverTemperature Protection (OTP)
The IC provides an accurate internal overtemperature protection of 150 癈 (typical). The
IC will maximize the current of pin OPTOPROT as soon as the internal temperature limit is
reached. The opto signal can be used on the primary side of the yback controller to
activate the SMPS protection or limit the output power. As soon as the overtemperature
condition is solved, normal operation will resume.
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