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参数资料
| 型号： | PM6681ATR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 0.4 A DUAL SWITCHING CONTROLLER, QCC32 |
| 封装： | 5 X 5 MM, 1 MM HEIGHT, 0.50 MM PITCH, ROHS COMPLIANT, VFQFPN-32 |
| 文件页数： | 18/47页 |
| 文件大小： | 2762K |
| 代理商： | PM6681ATR |
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PM6681A
Device description
25/47
7.7
soft-start and soft-end
Each switching section is enabled separately by asserting high EN1/EN2 pins respectively.
In order to realize the soft-start, at the startup the overcurrent threshold is set 25 % of the
nominal value and the undervoltage protection (see related sections) is disabled. The
controller starts charging the output capacitor working in current limit. The overcurrent
threshold is increased from 25 % to 100 % of the nominal value with steps of 25 % every
700
s (typ.). After 2.8 ms (typ.) the undervoltage protection is enabled. The s oft start time
is not programmable. A minimum capacitor CINT is required to ensure a soft-start without
any overshoot on the output:
Equation 10
Figure 37.
Soft-start waveforms
When a switching section is turned off (EN1/EN2 pins low), the controller enters in soft-end
mode. The output capacitor is discharged through an internal 18
P-MOSFET switch;
when the output voltage reaches 0.3 V, the low-side MOSFET turns on, keeping the output
to ground. The soft-end time also depends on load condition.
7.8
Gate drivers
The integrated high-current drivers allow to use different power MOSFETs. The high side
driver MOSFET uses a bootstrap circuit which is indirectly supplied by LDO5 output. The
BOOT and PHASE pins work respectively as supply and return rails for the HS driver.
The low side driver uses the internal LDO5 output for the supply rail and PGND pin as return
rail.
An important feature of the gate drivers is the adaptive anti-cross conduction protection,
which prevents high side and low side MOSFETs from being on at the same time. When the
out
L
Lvalley
INT
C
2
I
4
I
uA
6
C
×
+
≥
EN1/EN2
Current limit threshold
Switching
Time
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相关代理商/技术参数 |
参数描述 |
|---|---|
| PM6685 | 功能描述:DC/DC 开关控制器 Dual Step Down Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| PM6685_07 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Dual step-down main supply controller with auxilary voltages for notebook system power |
| PM6685TR | 功能描述:DC/DC 开关控制器 Monolithic VR RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| PM6686 | 制造商:STMicroelectronics 功能描述: |
| PM6686TR | 功能描述:DC/DC 开关控制器 Step-down Controller w/adj. voltages-dual RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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