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LD7530MGL
Schematic [ru]
20 pgs394.81 Kb0

Leadtrend LD7530MGL, LD7530MPL, LD7530NGL, LD7530NPL, LD7530MPN Schematic [ru]

LD7530M/LD7530N
6/3/2008
Green-Mode PWM Controller with Programmable OLP Delay Time
and Integrated Protections
REV: 01
The LD7530M/LD7530N are specifically designed for the
low total system cost by integrating many functions and
protections in a tiny SOT-26 package which usually need a
lot of extra components or circuits on the general designs.
Furthermore, the programmable OLP delay time function is
to reduce the circuit complexity and thus helps the power
circuit designers to easily deal with the peak load design by
using minimum component cost and developing time.
And to satisfy different designs, 2 versions of OVP levels are
implemented as ---
z LD7530M --- 28.0V ± 2.0V.
z LD7530N --- 21.0V ± 2.0V.
Typical Application
Features
z High-Voltage CMOS Process with Excellent ESD
protection
z Very Low Startup Current (<30μA)
z Current Mode Control
z Non-audible-noise Green Mode Control
z UVLO (Under Voltage Lockout)
z LEB (Leading-Edge Blanking) on CS Pin
z Internal Slope Compensation
z OVP (Over Voltage Protection) on Vcc Pin
z OLP (Over Load Protection) and programmable timer
z 300mA Driving Capability
Applications
z Switching AC/DC Adaptor and Battery Charger
z Open Frame Switching Power Supply
1
Leadtrend Technology Corporation www.leadtrend.com.tw
LD7530M&LD7530N-DS-01 June 2008
LD7530M/LD7530N
2
3
5
3
0
P
2
3
5
3
0
P
Pin Configuration (LD7530M)
DIP-8 (TOP VIEW) SOT-26 (TOP VIEW)
GND
COM
NC
7 6 5
TOP MARK
YYWW##
CT
OUT VCC CS
6
1
W1
Y
4
182 3 4
NC
OUT
VCC
YY, Y : Year code (D: 2004, E: 2 005…..) WW, W: Week code 1 : LD75..(M) (P roduct famil y code) ## : Product ion c ode
CS
Pin Configuration (LD7530N)
DIP-8 (TOP VIEW) SOT-26 (TOP VIEW)
GND
COM
NC
7 6 5
TOP MARK
YYWW##
182 3 4
OUT
NC
VCC
CT
CS
GND COMP CT
The P B fr ee pack ag e is iden tif ied in
Y
emb ossed f ont , whi le Gr een compoun d package i n norm al prin t
OUT VCC CS
6
W2
Y
1
GND COMP CT
The P B fr ee pack ag e is iden tif ied in
Y
emb ossed f ont , whi le Gr een compoun d package i n norm al prin t
4
YY, Y : Year code (D: 2004, E: 2 005…..) WW, W: Week code 2 : LD75..(N) (Prod uct famil y code) ## : Product ion c ode
2
Leadtrend Technology Corporation www.leadtrend.com.tw
LD7530M&LD7530N-DS-01 June 2008
LD7530M/LD7530N
Ordering Information
Part number Package TOP MARK Shipping
LD7530MGL SOT-26 Green Package YW1/30 3000 /tape & reel
LD7530MPL SOT-26 PB free YW1/30 3000 /tape & reel
LD7530MPN DIP-8 PB free LD7530MPN 3600 /tube /Carton
LD7530NGL SOT-26 Green Package YW2/30 3000 /tape & reel
LD7530NPL SOT-26 PB free YW2/30 3000 /tape & reel
LD7530NPN DIP-8 PB free LD7530NPN 3600 /tube /Carton
Note: The LD7530M/N are ROHS compliant/ Green Package.
Pin Descriptions
PIN
(SOT-26)
1 8 GND Ground
2 7 COMP
3 5 CT
4 4 CS Current sense pin, connect to sense the MOSFET current
5 2 VCC Supply voltage pin
6 1 OUT Gate drive output to drive the external MOSFET
PIN
(DIP-8)
NAME FUNCTION
Voltage feedback pin (same as the COMP pin in UC384X), By connecting
a photo-coupler to close the control loop and achieve the regulation.
This pin is to program the delay timer. By connecting a capacitor to
ground to set the OLP delay time.
3
Leadtrend Technology Corporation www.leadtrend.com.tw
LD7530M&LD7530N-DS-01 June 2008
∑
Block Diagram
LD7530M/LD7530N
VCC
CT
COMP
CS
32V
16.0V/
10.0V
OLP Timer
65KHz
OSC
Green-Mode
Control
UVLO Comparator
PG
OLP
Delay
Leading
Edge
Blanking
VCC OK
2R
R
0.85V
internal bias
& Vref
Vref OK
Protection
+
Slope Compensation
+
PWM Comparator
OCP Comparator
All Blocks
OVP Comparator
OVP
SQ
R
28.0V(LD7530M)
21.0V(LD7530N)
Driver
Stage
OUT
OLP Delay
5.0V OLP
Comparator
Counter
OLP Delay
GND
4
Leadtrend Technology Corporation www.leadtrend.com.tw
LD7530M&LD7530N-DS-01 June 2008
OVP OLP
PG
SQ
R
Protection
LD7530M/LD7530N
Absolute Maximum Ratings
Supply Voltage VCC 30V
COMP, CT, CS
Junction Temperature
Operating Ambient Temperature
Storage Temperature Range
Package Thermal Resistance (SOT-26)
Package Thermal Resistance (DIP-8)
Power Dissipation (SOT-26, at Ambient Temperature = 85°C)
Power Dissipation (DIP-8, at Ambient Temperature = 85°C)
Lead temperature (Soldering, 10sec)
ESD Voltage Protection, Human Body Model
ESD Voltage Protection, Machine Model
Gate Output Current 300mA
-0.3 ~7V
150°C
-20°C to 85°C
-65°C to 150°C
250°C/W
100°C/W
250mW
650mW
260°C
2.5 KV
250 V
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.
Recommended Operating Conditions
Item Min. Max. Unit
Supply Voltage Vcc (LD7530M) 11 25 V
Supply Voltage Vcc (LD7530N) 11 18 V
CT Value 0.047 0.1 μF
5
Leadtrend Technology Corporation www.leadtrend.com.tw
LD7530M&LD7530N-DS-01 June 2008
LD7530M/LD7530N
Electrical Characteristics
(TA = +25oC unless otherwise stated, VCC=15.0V)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Supply Voltage (Vcc Pin)
Startup Current 8 30 μA
V
=0V 2.0 3.0 mA
Operating Current
(with 1nF load on OUT pin)
UVLO (off) 8.5 10.0 11.0 V
UVLO (on) 14.5 16.0 17.5 V
OVP Level
Voltage Feedback (Comp Pin)
Short Circuit Current V
Open Loop Voltage COMP pin open 6.0 V
Green Mode Threshold VCOMP 2.35 V
Current Sensing (CS Pin)
Maximum Input Voltage, Vcs(off) 0.78 0.85 0.92 V
Leading Edge Blanking Time 200 nS
Input impedance 1 MΩ
Delay to Output 100 nS
Oscillator for Switching Frequency
Frequency 59 65 71 KHz
Green Mode Frequency 20 KHz
Temp. Stability (-40°C ~105°C) 6 %
Voltage Stability (VCC=11V-25V) 2 %
OLP Timer (CT pin)
Frequency
Gate Drive Output (OUT Pin)
Output Low Level VCC=15V, Io=20mA 1 V
Output High Level VCC=15V, Io=20mA 8 V
Rising Time Load Capacitance=1000pF 50 250 nS
Falling Time Load Capacitance=1000pF 30 150 nS OLP (Over Load Protection)
OLP Trip Level Vcomp(OLP) 5.0 V
OLP Delay Time CT=0.047μF 50 mS
COMP
V
=3V 2.5 mA
COMP
Protection tripped (OLP, OVP) 0.5 mA
LD7530M 26.0 28.0 30.0 V
LD7530N 19.0 21.0 23.0 V
=0V 1.5 3.0 mA
COMP
CT=0.1μF 100 Hz
CT=0.047μF 200 Hz
6
Leadtrend Technology Corporation www.leadtrend.com.tw
LD7530M&LD7530N-DS-01 June 2008
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