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參數(shù)資料
| 型號(hào)： | 88EM8081XX-SAG2C000-T |
| 廠商： | MARVELL SEMICONDUCTOR INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2 A POWER FACTOR CONTROLLER, 120 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | GREEN, SOIC-8 |
| 文件頁數(shù)： | 32/64頁 |
| 文件大小： | 667K |
| 代理商： | 88EM8081XX-SAG2C000-T |
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88EM8080/88EM8081
Datasheet
Doc. No. MV-S106340-01 Rev. B
Copyright 2010 Marvell
Page 38
Document Classification: Proprietary
August 6, 2010, Preliminary Information
The following equation can be used for the design of R1 and R2.
Equation (11)
Where, VOUT_MAX is the maximum output voltage, VD1 is the voltage drop on the diode D1, and
resistors R1, R2 and R4 are in k.
A reference design for a cost effective non-isolated LED driver is presented in Section 5.7.
5.3.3
LED Current Control with Isolated Output
The typical isolated output current control is shown in Figure 21.
Figure 21: Isolated LED Current Control
Figure 21 shows a typical configuration for LED current control when the output is isolated from the
AC input. The current through the LED also passes through the resistor R8 and the voltage across
R8 is used for output current sensing and for LED current control. In order to reduce the power
dissipation in the current sensing resistor, R8 could be selected to be a low value such as 0.1
. The
voltage across R8 at 500mA steady state current is 50mV.
This current sense voltage across R8 is amplified by the non-inverting amplifier U2 and is applied to
the inverting input of the U1 circuit. Typically, the TL431 IC is used for U1. U2 is necessary to amplify
the sense voltage to 2.5V at the steady state LED regulated current. This is because the
non-inverting input of U1 has a reference voltage of 2.5V nominal. The U1 device is used to
V
OUT_MAX
V
REF 1
R
1
200
---------
R
1
R
2
------
R
1
R
4
------
++
+
V
D1 1
R
1
R
2
------
+
+
=
VIN
C14
FB
IS
N
S
OC
P
SGND
PGND
VD
D
4
U3
SW
5
7
8
1
2
6
3
88
E
M
8081
C9
R19
3
4
R11
1
2
D1
VDD
C4
HVDC
R5
C6
Q1
D9
C11
C13
R23
LED +
LED -
C2
R4
R8
R3
R1
R2
U2
TS321LT
1
2
PC1A
FOD817A
D6
1
2
R22
R21
C1
12
3
VR
EF
1
5
3
4
2
U1
TL431
VOUT
Input Voltage from
Rectifier Bridge
IEOPTO
T1
VC
R12
R7
C8
VOUT_U2
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