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| 型号： | SIP11205DLP-T1-E3 |
| 厂商： | Vishay Siliconix |
| 文件页数： | 10/21页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR ISO PWM MLP44-16 |
| 标准包装： | 2,500 |
| PWM 型： | 控制器 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 占空比： | 50% |
| 电源电压： | 10.5 V ~ 13.2 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | PowerPAK? MLP44-16 |
| 包装： | 带卷 (TR) |
SiP11205
Vishay Siliconix
Product is End of Life 3/2014
Immediate Response to UVLO Faults:
The under voltage protection conditions at converter-level
(V INDET pin UVLO) and chip-level (V CC UVLO) will
immediately trigger a shutdown-and-retry SS response, with
the restart requirements being that:
1. The SS pin has been discharged at a 20 μA rate to the
0.25 V level.
2. The affected supply has recovered to its turn-on
threshold.
Once these conditions are met, switching will resume with a
normal soft-start cycle. Response to UVLO faults is enabled
at all times, including the initial ramp-up period of the soft-
start pin.
Immediate Response to an OTP Condition:
Failure of the application circuit to provide an external
voltage to the V CC pin above the V REG level may result in an
OTP condition (T J > OTP ON ). Other conditions, such as
excessive ambient temperature or, where applicable, failure
of airflow over the DC-DC converter circuit, can also trigger
an OTP condition. An OTP condition will immediately trigger
a shutdown-and-retry soft start response, with the restart
requirements being that:
1. The SS pin has been discharged at a 20 μA rate to the
0.25 V level.
2. The chip junction temperature has fallen below the lower
OTP threshold.
Once these conditions are met, switching will resume with a
normal soft-start cycle. Response to the OTP condition is
enabled at all times, including the initial ramp-up period of the
soft-start pin.
will be active during one oscillator cycle, and the DH during
the next oscillator cycle.
The feed-forward voltage appears at pin R OSC and equals to
V INDET /2. This voltage sets the peak voltage of the oscillator
waveform. Therefore the higher input voltage the higher
V INDET /2 and the higher oscillator peak voltage. The pulse
width of the drive signals DL and DH is then generated by
comparing the voltage at R DB pin with the oscillator output
saw tooth. The voltage at R DB pin is fixed so the higher input
voltage the narrower DL/DH pulse width and the lower the
duty cycle. (See Feed-forward Function Diagram.)
V INDET
The V INDET pin controls several modes of operation and the
modes of operation are controlled by shutdown (V SD ) and
under voltage (V UV ) comparators (see block diagram). When
the IC is powered solely by V IN and V INDET is less than V SDH
due to some external reset condition the pre-regulator is in
low power standby mode and the internal bias network is
powered down. When V INDET is greater than V SDH but less
than V REF and V CC is forced to 12 V the pre-regulator shuts
off drawing only leakage current from V IN and quiescent
current from V CC . In this mode the controller output drivers
remains static (non-switching). When V INDET is above V REF
the controller is enabled and both drivers are switching at half
the oscillator frequency. If SiP11205 is shut down via this pin,
its restart will be by means of a soft-start cycle, as described
under "Soft Start" and "Hiccup-Mode Operation" above.
The input impedance to ground of this pin is typically
46K ± 30 % and must be taken into account when designing
the feed-forward compensation. An external 10:1 resistor
divider ratio of supply voltage to V INDET pin is required in a
typical application.
Reference
The reference voltage of SiP11205 is set at 3.3 V at V REF
pin. This pin should be decoupled externally with a 0.1 μF to
1 μF capacitor to GND. Up to 5 mA may be drawn internally
from this reference to power external circuits. Note that if the
V INDET pin is pulled below 0.55 V (typical), the reference will
be turned off, and SiP11205 will enter a low-power "standby"
mode. During startup or when V REF is accidentally shorted to
ground, this pin has internal short circuit protection limiting
the source current to 50 mA. V REF load regulation for 5 mA
step is typically 0.45 %.
Oscillator
The oscillator is designed to operate from 200 kHz to 1 MHz
with temperature stability within 15 %. This operating
frequency range allows the converter to minimize the
inductor and capacitor size, improving the power density of
the converter. The oscillator frequency, and therefore the
switching frequency, is programmable by the value of
resistor and capacitor connected to the R OSC and C OSC pins
respectively. Note that the switching frequency at pins DL
and DH is half of the oscillator frequency, i.e., the DL output
www.vishay.com
10
Primary Side MOSFET Drivers
The low-side MOSFET driver is powered directly from V CC of
the chip. The high-side MOSFET however requires the gate
voltage to be higher than V IN . This is achieved with a charge
pump capacitor C BST between BST and LX, and an external
diode to charge and bootstrap the initial charge up voltage
across C BST to V CC level. On the alternate oscillator cycle
the boost diode isolates BST from V IN and hence BST and
LX steps up to V IN + V CC and V IN , respectively. This
sequencing insures that DL will always turn on before DH
during start-up. The boost capacitor value must be chosen to
meet the application droop rate requirement.
External Frequency Synchronization
The oscillator frequency of this IC can be synchronized to an
external source with a simple circuit shown in "Circuit for
Frequency Synchronization" diagram. The synchronized
frequency should not exceed 1.4 times the set frequency,
and the synchronized frequency range should not exceed
the IC frequency range.
Document Number: 69233
S-81795-Rev. C, 04-Aug-08
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SIP11205DQP-T1-E3 | 功能描述:开关变换器、稳压器与控制器 Feed-Fwd Controller with MOSFET Drivers RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| SIP11206 | 制造商:VISHAY 制造商全称:Vishay Siliconix 功能描述:Half-Bridge Controller with Primary MOSFET Drivers for Intermediate Bus Converters |
| SIP11206DLP-T1-E3 | 功能描述:开关变换器、稳压器与控制器 Half-Bridge with MOSFET Drivers RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| SIP11206DQP-T1-E3 | 功能描述:开关变换器、稳压器与控制器 Half-Bridge with MOSFET Drivers RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| SIP115 | 制造商:Power-One 功能描述: |
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