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参数资料
| 型号： | SIP11205DLP-T1-E3 |
| 厂商： | Vishay Siliconix |
| 文件页数： | 9/21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) |
Product is End of Life 3/2014
SiP11205
Vishay Siliconix
And the duty cycle on DL or DH will then be approximately
half of D TOTAL . Please note that due to oscillator comparator
overshoot the exact duty cycle calculated using above
formula may be slightly different. To better understand the
PWM operation during start up refer to "Timing Diagram and
Soft Start Duty Cycle Control" graph, for PWM operation
after start up see "Feed-Forward Function Diagram".
For each specific application the R DB1 /R DB2 ratio must be
chosen to provide maximum duty cycle with appropriate
dead time at minimum supply voltage. The voltage at R DB pin
that corresponds to maximum duty cycle at minimum input
voltage can be determined by applying a precise voltage
source on this pin for the dead time required. The SiP11205
has a stable 3.3 V reference with 3 % temperature accuracy,
so a typical 3 % duty variation and 1 % DL/DH matching can
be achieved. There will be 0.75 % duty reduction for each 1
V increase in the V IN supply range. For better system
efficiency it is recommended that the input voltage range be
limited to 42 V to 55 V.
Soft Start
The soft start circuit plays an important role in protecting the
controller. At startup it prevents high in-rush current. During
a normal start-up sequence (V CS < V MOC . V CS is the voltage
at CS pin), or following any event that would cause a
hiccup-and-soft-start sequence, C SS will be charged from
about 0 V to a final voltage of 2 V BE + V INDET /2 at a 20 μA
rate. As the voltage on the C SS rises towards the final
voltage, the maximum permitted DL and DH duty cycles will
increase from 0 % to a maximum defined by the R DB resistor
divider.
When a mild fault condition is detected (V CS = V MOC ), C SS
goes into a hiccup mode until fault condition is removed. The
hiccup is activated when C SS discharges to 0.85 V SS at
20 μA and subsequently at 0.4 μA until the fault condition is
removed. Refer to "Fault Conditions and Responses" for
details.
Fault Conditions and Responses
The faults that can cause a hiccup-and-retry cycle are
moderate over-current (MOC), severe over-current (SOC),
chip level UVLO, system level UVLO, and over temperature
protection (OTP).
Prior to detailing the various fault conditions and responses,
some definitions are given:
1. A complete switching period, T, consists of two oscillator
cycles T DL and T DH .
2. T DL (T DH ) is the oscillator cycle during which the DL (DH)
output is in the high state.
3. T is defined as starting at the beginning of T DL , and
terminating at the end of T DH .
Document Number: 69233
S-81795-Rev. C, 04-Aug-08
Response to MOC Faults (V MOC < V CS < V SOC ):
Once SiP11205 has completed a normal soft-start cycle, V SS
will be clamped at the final voltage, allowing the maximum
possible duty cycle on DL and DH.
If an MOC fault occurs following the start-up (due to a
condition such as an excessive load on the converter’s
output), SiP11205 will respond by gradually reducing the
available maximum duty cycle of its DL and DH outputs each
to be equal to approximately 42 % of their possible 47 %
maximum values. This is before any effects of deadtime
introduced by R DB are added in. This reduction in available
maximum duty cycle is achieved by reducing the voltage on
the SS pin to 4 V, as follows:
1. If V MOC < V CS < V SOC at any time during T DL , a current
of 20 μA will be drawn out of the SS pin until the
beginning of the next T DL .
2. If the voltage on the SS pin remains above the value that
would allow an available maximum DL and DH duty cycle
of 42 %, SiP11205 will continue operating.
3. If the voltage on the SS pin goes below the value that
would allow an available maximum DL and DH duty cycle
of 42 %, a hiccup interval is started, during which both DL
and DH are held in their low states.
4. The SS pin is discharged towards 0 V by a 400 nA sink
current.
5. The hiccup interval is terminated when the SS pin is
discharged to 0.25 V.
After the above actions have been taken switching on the DL
and DH outputs will then resume with a normal soft-start
cycle.
Response to MOC faults is enabled after the successful
completion of any normal soft-start cycle.
Response to SOC Faults (V CS > V SOC ):
This is an immediate, single-cycle response over current
shutdown, followed by a hiccup delay and a normal soft-start
cycle. Since this is a gross fault protection mechanism, its
triggering mechanism is asynchronous to the timing of T DL
and T DH .
1. If V CS > V SOC , a hiccup interval is started, during which
both DL and DH are held in their low states.
2. The SS pin is discharged towards 0 V by a 400 nA sink
current.
3. The hiccup interval is terminated when the SS pin is
discharged to 0.25 V.
4. Switching on the DL and DH outputs will then resume
with a normal soft-start cycle.
Severe over current response is enabled at all times,
including the initial ramp-up period of the soft-start pin. This
allows SiP11205 to provide rapid fault protection for the
converter’s power train.
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9
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相关代理商/技术参数 |
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| 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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