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参数资料
| 型号： | L6919E |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO28 |
| 封装： | SO-28 |
| 文件页数： | 6/33页 |
| 文件大小： | 644K |
| 代理商： | L6919E |
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L6919E
14/33
Figure 7. Output transient response without (a) and with (b) the droop function
Figure 8. Active Droop Function Circuit
The feedback current is equal to 50
A at nominal full load (IFB = IINFO1 + IINFO2) and 70A at the OC intervention
threshold, so the maximum output voltage deviation is equal to:
VFULL_POSITIVE_LOAD = -RFB 50A
VOC_INTERVENTION = -RFB 70A
Droop function is provided only for positive load; if negative load is applied, and then IINFOx < 0, no current is
sunk from the FB pin. The device regulates at the voltage programmed by the VID.
REMOTE VOLTAGE SENSE
A remote sense buffer is integrated into the device to allow output voltage remote sense implementation without
any additional external components. In this way, the output voltage programmed is regulated between the re-
mote buffer inputs compensating motherboard trace losses or connector losses if the device is used for a VRM
module. The very low offset amplifier senses the output voltage remotely through the pins FBR and FBG (FBR
is for the regulated voltage sense while FBG is for the ground sense) and reports this voltage internally at VSEN
pin with unity gain eliminating the errors. Keeping the FBR and FBG traces parallel and guarded by a power
plane results in common mode coupling for any picked-up noise.
If remote sense is not required, it is enough connecting RFB directly to the regulated voltage: VSEN becomes
not connected and still senses the output voltage through the remote buffer. In this case the FBG and FBR pins
must be connected anyway to the regulated voltage (See figure 10).
The remote buffer is included in the trimming chain in order to achieve ±0.5% accuracy on the output voltage
when the RB Is used: eliminating it from the control loop causes the regulation error to be increased by the RB
offset worsening the device performances.
VMAX
VMIN
VNOM
(a)
(b)
ESR DROP
VDROOP
Ref
COMP
FB
To VOUT
Total Current Info (I
INFO1+IINFO2)
VDROOP
RFB
Ref
COMP
FB
To VOUT
Total Current Info (I
INFO1+IINFO2)
VDROOP
RFB
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