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ACT4529YH-T0001 参数 Datasheet PDF下载

ACT4529YH-T0001图片预览
型号: ACT4529YH-T0001
PDF下载: 下载PDF文件 查看货源
内容描述: [40V/3.0A CV/CC Buck Converter Featuring QC2.0, USB Auto-Detect and USB-PD]
分类和应用: 光电二极管
文件页数/大小: 15 页 / 1917 K
品牌: ACTIVE-SEMI [ ACTIVE-SEMI, INC ]
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ACT4529  
Rev 4, 06-Jan-2017  
FUNCTIONAL BLOCK DIAGRAM  
HSB  
VIN  
UVLO  
PWM  
Controller  
PDC  
70m  
USB  
Auto  
Detect  
QC2.0  
Detect  
SW  
Driver  
4.7Ω  
DP  
Current Sense  
and Control  
OVP  
DM  
CSP  
CSN  
GND  
FUNCTIONAL DESCRIPTION  
Output Under-Voltage Protection /  
Hiccup Mode  
Output Current Sensing and Regulation  
Sense resistor is connected to CSP and CSN. The  
sensed differential voltage is compared with interval  
reference to regulate current. CC loop and CV loop  
are in parallel. The current loop response is allowed  
to have slower response compared to voltage loop.  
However, during current transient response, the  
inductor current overshoot/undershoot should be  
controlled within +/-25% to avoid inductor  
saturation.  
There is  
a
under voltage protection (UVP)  
threshold. If the UVP threshold is hit for 10us, an  
over current or short circuit is assumed, and the  
converter goes into hiccup mode by disabling the  
converter and restarts after hiccup waiting period.  
Input Brownout Protection  
(ACT4529YH-T1011 only)  
Cycle-by-Cycle Current Control  
If the input voltage drops below 8V but higher than  
UVLO for 450ms while in QC or PDC mode, the  
output voltage turns off and QC or PDC mode is  
disabled. If the output voltage drops below 3.7V, the  
timer restarts and waits for 450ms before  
attempting to restart the output voltage. When  
output voltage rises above 3.9V and detects the  
input voltage below 8V, timer restarts. If the input  
voltage is below 8V after 450ms, the output turns  
off. The cycle continues until the input voltage  
increases above 8.2V,for longer than 450ms, then  
output turns on, the IC renegotiates the PD and QC  
protocols, and normal operation restarts.  
The conventional cycle-by-cycle peak current mode  
is implemented with high-side FET current sense.  
Input Over Voltage Protection  
The converter is disabled if the input voltage is  
above 42V (+/-2V). Device resumes operation  
automatically 40ms after OVP is cleared.  
Output Over Voltage Protection  
Device stops switching when output over-voltage is  
sensed, and resumes operation automatically when  
output voltage drops to OVP- hysteresis.  
Thermal Shutdown  
Output Over Voltage Discharge  
If the TJ increases beyond 160°C, ACT4529 goes  
into HZ mode and the timer is preserved until TJ  
drops by 30°C.  
Discharge circuit starts to discharge output through  
CSP pins when output over voltage is detected.  
Discharge circuit brings 12V down to 5V in less  
than 100ms.  
Innovative PowerTM  
- 6 -  
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