LD8526
08/31/2018
Synchronous Rectification Driver
with Green Mode Function
REV. 00
General Description
LD8526 is a secondary side synchronous rectification (SR)
driver IC. It is suited for flyback low side and high side
synchronous rectification in CCM, DCM and QR mode. For
forward freewheeling rectification application, LD8526 can
be applied in CCM and DCM operation.
In light load condition, LD8526 will enter green mode to
reduce operation current by stopping SR MOSFET driving
function.
LD8526 can generate its own supply voltage through low
output voltage or high side rectification applications to
charge battery.
Features
Suited for low side and high side flyback synchronous
rectification in CCM, DCM and QR(valley lock) mode
Suited for forward freewheeling rectification in CCM
and DCM
Self-supplying for operation with low output voltage
and/or high–side rectification without an auxiliary
winding.
Suited for primary side with peak load function (max.
frequency 130kHz)
Suited for PD application, which output voltage range
from 3V to 21V, and VCC range from 3V to 6V.
Programmable turn-off level
Fast turn-off total delay of 30ns
200A ultra-low green mode operation current
Gate source/sink capability: 0.5A/-3A
Applications
Switching AC/DC adaptor and battery charger
Open frame switching power supply
1
Leadtrend Technology Corporation
LD8526-DS-00 August 2018
www.leadtrend.com.tw
LD8526
08/31/2018
Typical Application
DC
Output
GND
DRV
DET
2
1
4
5
6
HVR
VIN
VCC
Fig. 1 Flyback Low Side Synchronous Rectification
LD8526
4
3
DRV
GND
1
DET
HVR
DC
Output
LD8526
2
3
5
6
VCC
VIN
Fig. 2 Flyback High Side Synchronous Rectification
2
Leadtrend Technology Corporation
LD8526-DS-00 August 2018
www.leadtrend.com.tw
LD8526
08/31/2018
Pin Configuration
SOT-26 (TOP VIEW)
VIN
HVR
DET
6
5
YWZ
1
2
26
pp
4
3
DRV
GND
VCC
Y
W
PP
Z26
: Year code (D: 2004, E: 2005…..)
: Week code
: Production code
: LD8526
Ordering Information
Part number
LD8526 GL
SOT-26
Package
Green Package
Top Mark
YWZ/26
Shipping
3000 / tape & reel
The LD8526 is ROHS compliant/ green packaged.
Protection Mode
Part number
LD8526
Int. OTP
Auto-Restart
Pin Description
PIN
(SOT-26)
NAME
DRV
GND
VCC
DET
HVR
VIN
FUNCTION
Driving pin, connector to GATE pin of MOSFET directly or through a resistor
Ground pin
Supply voltage pin
Synchronous rectification detection
HV linear regulator input
External supply input
1
2
3
4
5
6
3
Leadtrend Technology Corporation
LD8526-DS-00 August 2018
www.leadtrend.com.tw
LD8526
08/31/2018
Block Diagram
VIN
LDO
HVR
LDO
VCC
Green Mode
Detect
V
BIAS
I
DET_OFF
Driver
Stage
SR_ON
Logic
DRV
DET
S
Q
+
-
V
DET_OFF
+
-
Int. OTP
R
Minimum on/off time
GND
4
Leadtrend Technology Corporation
LD8526-DS-00 August 2018
www.leadtrend.com.tw
LD8526
08/31/2018
Absolute Maximum Ratings
DET
HVR
VIN
VCC
DRV
Maximum Junction Temperature
Storage Temperature Range
Package Thermal Resistance (SOT-26)
Power Dissipation (SOT-26, at Ambient Temperature = 85C)
Lead temperature (Soldering, 10sec)
ESD Voltage Protection, Human Body Model (except of DET/HVR Pin)
ESD Voltage Protection, Human Body Model (DET/HVR Pin)
ESD Voltage Protection, Machine Model
Caution:
Stresses beyond the ratings specified in “absolute maximum ratings” may cause permanent damage to the device. This is a stress only rating
and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not
implied.
-1V ~ 200V
-1V ~ 200V
-0.3V ~ 30V
-0.3V ~ 7V
-0.3V~VCC+0.3V
150C
-65C to 150C
200C/W
200mW
260C
2.5KV
1KV
250V
Recommended Operating Conditions
Item
Operating Junction Temperature
Supply Voltage VIN
Supply Voltage VCC
Power MOS Gate Threshold Voltage
Operating Frequency
VCC capacitor
MOSFET Ciss
(1)
Turn-Off Rgate
(1)
RDET
2.2
1000
0
5500
5
600
3
1.5
Min.
-40
Max.
125
24
6
4
130
Unit
C
V
V
V
KHz
F
pF
Ω
Ω
Notes:
1. When MOSFET Ciss is the maximum value, turn-off R
GATE
must be the minimum value. On the contrary, when MOSFET
Ciss is the minimum, turn-off R
GATE
must be the maximum.
5
Leadtrend Technology Corporation
LD8526-DS-00 August 2018
www.leadtrend.com.tw
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