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| 型号： | TNY263P |
| 厂商： | Power Integrations |
| 文件页数： | 3/22页 |
| 文件大小： | 0K |
| 描述： | IC OFFLINE SWIT OTP OCP HV 8DIP |
| 标准包装： | 3,000 |
| 系列： | TinySwitch®-II |
| 输出隔离： | 隔离 |
| 频率范围： | 124kHz ~ 140kHz |
| 输出电压： | 700V |
| 功率（瓦特）： | 7.5W |
| 工作温度： | -40°C ~ 150°C |
| 封装/外壳： | 8-DIP（0.300"，7.62mm），7 引线 |
| 供应商设备封装： | DIP-8B |
| 包装： | 管件 |
TNY263-268
TinySwitch-II Functional Description
TinySwitch-II combines a high voltage power MOSFET switch
with a power supply controller in one device. Unlike
conventional PWM (pulse width modulator) controllers,
TinySwitch-II uses a simple ON/OFF control to regulate the
output voltage.
The TinySwitch-II controller consists of an oscillator, enable
circuit (sense and logic), current limit state machine,
5.8 V regulator, BYPASS pin undervoltage circuit, over-
temperature protection, current limit circuit, leading edge
blanking and a 700 V power MOSFET. TinySwitch-II
incorporates additional circuitry for line undervoltage sense,
auto-restart and frequency jitter. Figure 2 shows the functional
block diagram with the most important features.
Oscillator
The typical oscillator frequency is internally set to an average
of 132 kHz. Two signals are generated from the oscillator: the
maximum duty cycle signal (DC MAX ) and the clock signal that
indicates the beginning of each cycle.
The TinySwitch-II oscillator incorporates circuitry that
introduces a small amount of frequency jitter, typically 8 kHz
peak-to-peak, to minimize EMI emission. The modulation rate
of the frequency jitter is set to 1 kHz to optimize EMI reduction
for both average and quasi-peak emissions. The frequency
jitter should be measured with the oscilloscope triggered at
the falling edge of the DRAIN waveform. The waveform in
Figure 4 illustrates the frequency jitter of the TinySwitch-II.
Enable Input and Current Limit State Machine
The enable input circuit at the EN/UV pin consists of a low
impedance source follower output set at 1.0 V. The current
through the source follower is limited to 240 μ A. When the
current out of this pin exceeds 240 μ A, a low logic level
(disable) is generated at the output of the enable circuit. This
enable circuit output is sampled at the beginning of each cycle
on the rising edge of the clock signal. If high, the power
MOSFET is turned on for that cycle (enabled). If low, the power
600
MOSFET remains off (disabled). Since the sampling is done
only at the beginning of each cycle, subsequent changes in
the EN/UV pin voltage or current during the remainder of the
cycle are ignored.
The current limit state machine reduces the current limit by
discrete amounts at light loads when TinySwitch-II is likely to
switch in the audible frequency range. The lower current limit
raises the effective switching frequency above the audio range
and reduces the transformer ?ux density, including the
associated audible noise. The state machine monitors the
sequence of EN/UV pin voltage levels to determine the load
condition and adjusts the current limit level accordingly in
discrete amounts.
Under most operating conditions (except when close to no-
load), the low impedance of the source follower keeps the
voltage on the EN/UV pin from going much below 1.0 V in the
disabled state. This improves the response time of the
optocoupler that is usually connected to this pin.
5.8 V Regulator and 6.3 V Shunt Voltage Clamp
The 5.8 V regulator charges the bypass capacitor connected
to the BYPASS pin to 5.8 V by drawing a current from the
voltage on the DRAIN pin whenever the MOSFET is off. The
BYPASS pin is the internal supply voltage node for the
TinySwitch-II. When the MOSFET is on, the TinySwitch-II
operates from the energy stored in the bypass capacitor.
Extremely low power consumption of the internal circuitry
allows TinySwitch-II to operate continuously from current it
takes from the DRAIN pin. A bypass capacitor value of 0.1 μ F
is suf ?cient for both high frequency decoupling and energy
storage.
In addition, there is a 6.3 V shunt regulator clamping the
BYPASS pin at 6.3 V when current is provided to the BYPASS
pin through an external resistor. This facilitates powering of
TinySwitch-II externally through a bias winding to decrease the
no-load consumption to about 50 mW.
BYPASS Pin Undervoltage
The BYPASS pin undervoltage circuitry disables the power
MOSFET when the BYPASS pin voltage drops below 4.8 V.
500
V DRAIN
Once the BYPASS pin voltage drops below 4.8 V, it must rise
back to 5.8 V to enable (turn-on) the power MOSFET.
400
300
200
100
0
136 kHz
Over Temperature Protection
The thermal shutdown circuitry senses the die temperature.
The threshold is typically set at 135 ° C with 70 ° C hysteresis.
When the die temperature rises above this threshold the
power MOSFET is disabled and remains disabled until the die
temperature falls by 70 ° C, at which point it is re-enabled. A
large hysteresis of 70 ° C (typical) is provided to prevent
overheating of the PC board due to a continuous fault
condition.
128 kHz
Current Limit
The current limit circuit senses the current in the power
0
Figure 4.
Frequency Jitter.
5
Time ( μ s)
10
MOSFET. When this current exceeds the internal threshold
(I LIMIT ), the power MOSFET is turned off for the remainder of
3
www.powerint.com
Rev. H 02/09
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| TNY263PG | 功能描述:交流/直流开关转换器 4.7 W (85-265 VAC) 7.5 W (230 VAC) RoHS:否 制造商:STMicroelectronics 输出电压:800 V 输入/电源电压（最大值）:23.5 V 输入/电源电压（最小值）:11.5 V 开关频率:115 kHz 电源电流:1.6 mA 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:SSO-10 封装:Reel |
| TNY263PN | 功能描述:交流/直流开关转换器 4.7W 85-265 VAC 7.5W/230 VAC RoHS:否 制造商:STMicroelectronics 输出电压:800 V 输入/电源电压（最大值）:23.5 V 输入/电源电压（最小值）:11.5 V 开关频率:115 kHz 电源电流:1.6 mA 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:SSO-10 封装:Reel |
| TNY263PN-TL | 制造商:POWERINT 制造商全称:Power Integrations, Inc. 功能描述:Enhanced, Energy Efficient, Low Power Off-line Switcher |
| TNY263PTL | 制造商:POWERINT 制造商全称:Power Integrations, Inc. 功能描述:Enhanced, Energy Efficient, Low Power Off-line Switcher |
| TNY264 | 制造商:POWERINT 制造商全称:Power Integrations, Inc. 功能描述:Generic PCB for DVD Player using TinySwitch-II |
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