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參數(shù)資料
| 型號(hào)： | SI9165 |
| 廠商： | Vishay Intertechnology,Inc. |
| 英文描述： | High Frequency 600-mA Synchronous Buck/Boost Converter |
| 中文描述： | 高頻600毫安同步降壓/升壓轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 6/8頁(yè) |
| 文件大小： | 74K |
| 代理商： | SI9165 |
Si9165
Vishay Siliconix
www.vishay.com
6
Document Number: 70845
S-40693—Rev. C, 19-Apr-04
FUNCTIONAL BLOCK DIAGRAM
Reference
Threshold
Generator
Oscillator
PSM
Modulator
PWM
Modulator
Soft-Start
Timer
UVLO
POR
Bias
Generator
OTP
Drivers
PWM/PSM
Select
V
DD
SD
V
S
V
IN/OUT
GND
PGND
Positive
Supply
COIL
Negative
Return and
Substrate
P
N
PWM
EN
PSM
EN
PWM
IN
PSM
IN
0.5 V
1.0 V
Ramp
C
OSC
V
REF
V
O
FB
COMP
SYNC
R
OSC
PWM/PSM
MODE
DETAIL OPERATIONAL DESCRIPTION
Start-Up
The UVLO circuit prevents the internal MOSFET switches and
oscillator circuit from turning on, if the voltage on V
DD
pin is less
than 2.5 V. With typical UVLO hysteresis of 0.1 V, controller is
continuously powered on until the V
DD
voltage drops below
2.4 V. This hysteresis prevents the converter from oscillating
during the start-up phase and unintentionally locking up the
system. Once the V
DD
voltage exceeds the UVLO threshold,
and with no other shutdown condition detected, an internal
Power-On-Reset timer is activated while most circuitry, except
the output driver, are turned on. After the POR timeout of about
1 ms, the internal soft-start capacitor is allowed to charge.
When the soft-start capacitor voltage reaches 0.5 V, the PWM
circuit is enabled. Thereafter, the constant current charging
the soft-start capacitor will force the output voltage to rise
gradually without overshooting.
To prevent negative
undershoot, the synchronous switch is tri-stated until the duty
cycle reaches about 10%.
In tri-state, the high-side p-channel
MOSFET is turned off by pulling up the gate voltage to V
S
potential. The low-side n-channel MOSFET is turned off by
pulling down the gate voltage to PGND potential. Note that the
Si9165 will always soft starts in the PWM mode regardless of
the voltage level on the PWM/PSM pin.
Shutdown
The Si9165 is designed to conserve as much battery life as
possible by decreasing current consumption of IC during
normal operation as well as the shutdown mode. With logic low
level on the SD pin, current consumption of the Si9165 is
decreased to less than 1
A by shutting off most of the circuits.
The logic high enables the controller and starts up as
described in “Start-Up” section above.
Over Temperature Protection
The Si9165 is designed with over temperature protection
circuit to prevent MOSFET switches from running away. If the
temperature reaches 165 C, internal soft-start capacitor is
discharged, shutting down the output stage. Converter
remains in the disabled mode until the temperature in the IC
decreases below 140 C.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SI9165_07 | 制造商:VISHAY 制造商全稱(chēng):Vishay Siliconix 功能描述:High Frequency 600-mA Synchronous Buck/Boost Converter |
| SI9165BQ-T1 | 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 2MHz Controller RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| SI9165BQ-T1-E3 | 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 Sync Buck/Boost Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| SI9165DB | 功能描述:電源管理IC開(kāi)發(fā)工具 SI9165 Demo Board RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類(lèi)型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| SI9165DB-K | 制造商:Vishay Siliconix 功能描述:SI9165 DEMOB BOARD - Bulk 制造商:Vishay Siliconix 功能描述:IC, SYNCHRONOUS BUCK/BOOST CONV 20-TSSOP; Primary Input Voltage:6V; No. of Outputs:1; Output Voltage:1.3V; Output Current:600mA; No. of Pins:20; Operating Temperature Min:-25C; Operating Temperature Max:85C; Supply Voltage Max:6V ;RoHS Compliant: No |
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