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LD5525GL Datasheet(PDF) 12 Page - Leadtrend Technology

Part # LD5525GL
Description  Multi-Mode PWM Controller of Flyback with Integrated BNI/BNO and Protection
PDF  16 Pages
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Manufacturer  LEADTREND [Leadtrend Technology]
Direct Link  https://www.leadtrend.com.tw/
Logo LEADTREND - Leadtrend Technology

LD5525GL Datasheet(HTML) 12 Page - Leadtrend Technology

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LD5525
06/30/2015
12
Leadtrend Technology Corporation
www.leadtrend.com.tw
LD5525-DS-00 June 2015
Adjustable Over Current Compensation on
FB Pin
For compensating the differential input current from
high/low line conditions on current sensing resistor,
LD5525 mirrors a compensation current IOCP from IFB to
CS pin. The relationship of compensation current IOCP and
IFB is expressed by following equation and shown in Fig.
13.
FB
OCP
I
K
I
×
=
, where
5
.
0
=
K
K is the mirror current ratio of FB pin, and the IOCP follows
to the input voltage.
The compensation current IOCP supplies an offset voltage
by external resistor ROCP, which is series between the
current sensing resistor RS and CS pin. By selecting a
proper value of the resistor ROCP in series with the CS pin,
the amount of compensation can be adjusted.
IFB
IOCP
95uA
400uA
47.5uA
200uA
Fig. 13
Brown-In/
Brown-Out
Protection
(BNI/BNO)
– Auto Recovery
The LD5525 integrate the brown in, brownout protection
and valley detection into FB pin. The auxiliary voltage
reflects a proportional bulk voltage during the on time. Fix
the internal current at the BNI and BNO, the BNI level
could be set by modulating the FB divided resistors and
auxiliary voltage, as shown in Fig. 14. For preventing the
abnormal condition of line voltage to causing damage,
BNO function is implemented, while turns off the gate
signal after de-bounce time 60ms as BNO occurring, as
shown in Fig. 15. The relationship of input voltage and
BNI/BNO is expressed in following equation.
������������_������������ =
��������
��������
∙ ���������������� ∙ ����1
������������_������������ =
��������
��������
∙ ���������������� ∙ ����1
,where
VDC_BNI is predicted BNI DC value of input voltage
VDC_BNO is predicted BNO DC value of input voltage
IBNI is BNI trip current.
IBNO is BNO trip current.
Np is turns ration of primary-side winding
Na is turns ration of auxiliary winding
LD5525
R1
R2
VCC
FB
GND
Va
VFB
Fig. 14



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