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参数资料
| 型号： | L6615N |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDIP8 |
| 封装： | MINI, DIP-8 |
| 文件页数： | 2/20页 |
| 文件大小： | 394K |
| 代理商： | L6615N |
L6615
10/20
3
SHARE DRIVE SECTION, ERROR AMPLIFIER AND ADJUST AMPLIFIER
The gain between the output of CSA (CGA pin) and output of SDA (SH pin) is 1 (typ.) so, for the master
power supply, VCGA = VSH; the voltage on the share bus is imposed by the master.
In the slave converters, being VCGA(SLAVE) < VCGA(MASTER), the diode at the output of SDA (see block
diagram) isolates the output this amplifier from the share bus.
The Share Sense Amplifier (SSA) reads the bus voltage transferring the signal to the non-inverting input
of the error amplifier where it is compared with CGA voltage.
Whenever a controller acts as the master in the system, the voltage difference between the E/A inputs is
zero. To guarantee its output low in such condition, a 40mV offset is inserted in series with the inverting
input.
Instead in the slave converters the input voltage difference is proportional to the difference between the
master load current and the relevant slave load current.
The transconductance E/A converts the
V at its inputs in a current equal to
flowing in the compensation network connected between COMP pin and ground.
The E/A output voltage drives the adjust amplifier to sink current from the ADJ pin that is connected to the
output voltage through a small resistor along the sense path. The current sunk by ADJ pin is deviated from
feedback path of the slave power supply that reacts increasing its duty cycle.
In steady state the current sunk by the ADJ pin is proportional to the value of error amplifier output.
4
DESIGNING WITH L6615
The first design step is usually the choice of the sense resistor whose maximum value is limited by power
dissipation; this constraint must be traded off against the precision of L6615 current sensing. In fact a small
sense resistance value lowers the power dissipation but reduces the signal available at the inputs of the
L6615 current sense amplifier.
Once fixed RSENSE then the values for RG and RGCA will be chosen in accordance with the application
specs: usually these specs define the share bus voltage (VSH(MAX)) and the number of paralleled power
supplies.
Their value must comply with the constraints imposed by the L6615:
Figure 11. Simplified feedback block diagram.
I
OU T
G
M
V
=
PWM
CONTROLLER
PWM
CONTROLLER
Z
L
I
LOAD
R
SENSE
R
SENSE
Σ
+
-
SHARE BUS
G
M*ZCOMP(s)*RADJ
R
A
Σ
+
-
+
V
REF
K*V
OUT (*)
G
M*ZCOMP(s)*RADJ
R
A
Σ
+
-
+
V
REF
K*V
OUT (*)
POWER
STAGE 1
POWER
STAGE 2
V
OUT
α * R
CGA / RG
α * R
CGA / RG
I
OUT(1)
I
OUT(2)
(*) K depends on the
feedback divider ratio
PWM
CONTROLLER
PWM
CONTROLLER
Z
L
I
LOAD
R
SENSE
R
SENSE
Σ
+
-
SHARE BUS
G
M*ZCOMP(s)*RADJ
R
A
Σ
+
-
+
V
REF
K*V
OUT (*)
G
M*ZCOMP(s)*RADJ
R
A
Σ
+
-
+
V
REF
K*V
OUT (*)
POWER
STAGE 1
POWER
STAGE 2
V
OUT
α * R
CGA / RG
α * R
CGA / RG
I
OUT(1)
I
OUT(2)
(*) K depends on the
feedback divider ratio
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L6622-01 | 制造商:HAMAMATSU 制造商全称:Hamamatsu Corporation 功能描述:130 KV MICROFOCUS X-RAY SOURCE |
| L-663 | 制造商:RHOMBUS-IND 制造商全称:Rhombus Industries Inc. 功能描述:CURRENT SENSE INDUCTOR |
| L6-6330 | 制造商: 功能描述: 制造商:undefined 功能描述: |
| L6660 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:MILLI-ACTUATOR DRIVER |
| L6668 | 功能描述:电流型 PWM 控制器 SMART PRIMARY CONTROLLER RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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