SGP400TZ

FEATURES: 
* 􀂄Linearly decreasing PWM frequency
* Green-mode under light-load and zero-load conditions
* Constant voltage (CV) and constant current (CC)
* No secondary feedback
* Low start-up current (8μA)
* Low operating current (3.6mA)
* Leading-edge blanking
* Constant power limit
* Universal AC input range
* Synchronized slope compensation
* 140°C OTP sensor with hysteresis
* VDD over-voltage clamping
* Cycle-by-cycle current limiting
* Under-voltage lockout (UVLO)
* Fixed PWM frequency with hopping
* Gate output maximum voltage clamped at 17V
* Small SOT-26 package

APPLICATIONS: 

Low-power flyback power converters, such as:
* Battery chargers for cellular phones, cordless phones, PDAs, digital cameras, and power tools
* Power adapters for ink jet printers, video game consoles, and portable audio players
* Open-frame SMPS for TV/DVD standby and other auxiliary supplies, home appliances, consumer
* electronics, and PC 5V standby-power
* Replacements for linear transformers and RCC SMPS

DESCRIPTION: 
This highly integrated PWM controller provides several features to enhance the performance of low-power
flyback converters. To minimize standby power consumption, the proprietary green-mode function
provides off-time modulation to linearly decrease the switching frequency under light-load and zero-load
conditions. This green-mode function enables the power supply to meet international power conservation
requirements. The supply voltage, VDD, is also used for feedback compensation, to regulate the output voltage
without requiring a conventional TL431 and a photo-coupler. The typical start-up current is only 8μA,
while the typical operating current can be as low as 3.6mA. A large start-up resistance could be used to
achieve even higher power conversion efficiency. SGP400 integrates a frequency hopping function, which
helps reduce EMI emission of a power supply with minimum line filters. Built-in synchronized slope
compensation maintains the stability of peak current-mode control. Proprietary internal compensation
ensures constant output power limiting over a universal range of AC input voltages, from 90VAC to 264VAC.
Pulse-by-pulse current limiting ensures a constant output current, even if a short-circuit occurs. Also, the internal
protection circuit disables PWM output if VDD exceeds 22.7V. The gate output is clamped at 16.7V to protect the
power MOS from over-voltage damage. The built-in over temperature protection (OTP) function shuts down the 

ontroller at 140°C with a 30°C hysteresis. The SGP400, designed to provide a low-cost total solution for flyback

converters, is available in a small footprint, 6-pin, SOT-26 package.

企业名：荣盛电子(香港)有限公司

类型：贸易/代理/分销

电话： 0755-82819399

手机：13530050576

联系人：蔡小姐

QQ：

邮箱：hkrongsheng@163.com

地址：广东深圳门市：新亚洲电子市场一期4C005 公司：福田区中航路鼎城2203