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參數(shù)資料
| 型號(hào)： | L6615N |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDIP8 |
| 封裝： | MINI, DIP-8 |
| 文件頁數(shù)： | 20/20頁 |
| 文件大?。?/td> | 394K |
| 代理商： | L6615N |
9/20
L6615
2
CURRENT SENSE SECTION
A sense resistor is typically used to generate the voltage drop, proportional to the load current, measured
by the CSA (Current Sense Amplifier), whose input pins (pins #2 and #3) are connected across of RSENSE
through two identical resistors (RG1 and RG2).
The CSA consists of 2 sections (see fig. 10), one responsible for the high side sensing, the other for low
side sensing. An internal comparator activates the relevant section in accordance with the voltage present
at CS+ pin: if this voltage is higher than 1.6V (typ), then the high side sensing section will be activated
(fig10.a) otherwise the low side sensing one will (fig 10.b). For the sake of simplicity we will consider RG1=
RG2= RG.
As the voltage drop IOUT*RSENSE is present at the input of the Sense Amplifier section, its output forces
the controlled current mirror to:
– sink current from the CS+ pin in case of high side sensing (neglecting input bias current, no current flows
through CS- pin);
– source current from the CS- pin in case of low side sensing (neglecting input bias current, no current
flows through CS- pin).
The local feedback imposes the same voltage at the current sense input pins, so under closed loop con-
dition VSENSE=VRG.
The current
(ICS+ in case of high side, ICS- in case of low side) is then internally mirrored and sent to the CGA pin caus-
ing a drop across the RCGA external resistor: two internal buffers transfer VCGA signal on the share pin so:
Only the L6615 VCC limits the upper voltage at the CGA and SH pin, independently of the voltage present
at the current sense pins.
In noisy applications, two capacitors of small value (e.g. 1nF) connected between current sense pins and
ground could be useful to clean the signal at the input of the current sense amplifier.
For low voltage buses application, see paragraph 7.
Figure 10. Current sense section
I
CS
I
OU T
R
SEN SE
R
G
---------------------------------------
=
V
SH
V
SNS
R
G
-------------- R
CGA
=
COMPARE
CS-
CS+
LSA
CGA
PS+
LOAD(+)
I
OUT
R
SENSE
R
G
R
G
V
SENSE
I
CGA
I
CS+
V
RG
HSA
+
-
+
-
R
CGA
L6615
1.6V
CONTROLLED
CURRENT
MIRROR
1:1
SINK
CSA
LOAD(-) / GND
PS-
COMPARE
CS-
CS+
LSA
CGA
I
OUT
R
SENSE
R
G
R
G
V
SENSE
I
CGA
V
RG
HSA
+
-
+
-
R
CGA
L6615
1.6V
CONTROLLED
CURRENT
MIRROR
SOURCE
CSA
1:1
I
CS-
COMPARE
CS-
CS+
LSA
CGA
PS+
LOAD(+)
I
OUT
R
SENSE
R
G
R
G
V
SENSE
I
CGA
I
CS+
V
RG
HSA
+
-
+
-
R
CGA
L6615
1.6V
CONTROLLED
CURRENT
MIRROR
1:1
SINK
CSA
LOAD(-) / GND
PS-
COMPARE
CS-
CS+
LSA
CGA
I
OUT
R
SENSE
R
G
R
G
V
SENSE
I
CGA
V
RG
HSA
+
-
+
-
R
CGA
L6615
1.6V
CONTROLLED
CURRENT
MIRROR
SOURCE
CSA
1:1
I
CS-
a) high side sensing
b) low side sensing
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