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PDF LD5530R Data sheet ( Hoja de datos )
| Número de pieza | LD5530R | |
| Descripción | Green-Mode PWM Controller | |
| Fabricantes | Leadtrend Technology | |
| Logotipo |  |
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LD5530R
6/6/2013
Green-Mode PWM Controller with Frequency Swapping
and Integrated Protections
Rev. 00
General Description
The LD5530R is built-in with several functions, protection
and EMI-improved solution in a tiny package. It takes less
components counts or circuit space, especially ideal for
those total solutions of low cost.
The implemented functions include low startup current,
green-mode power-saving operation, leading-edge
blanking of the current sensing and internal slope
compensation. It also features more protections like
OLP (Over Load Protection) and OVP (Over Voltage
Protection) to prevent circuit damage occurred under
abnormal conditions.
Furthermore, the Frequency Swapping function is to
reduce the noise level and thus helps the power circuit
designers to easily deal with the EMI filter design by
spending minimum amount of component cost and
developing time.
Features
High-Voltage CMOS Process with Excellent ESD
protection
Very Low Startup Current (<1A)
Current Mode Control
Green Mode Control
UVLO (Under Voltage Lockout)
LEB (Leading-Edge Blanking) on CS Pin
Internal Frequency Swapping
Internal Slope Compensation
OVP (Over Voltage Protection) on Vcc Pin
Adjustment OVP(Over Voltage Protection) on CS Pin
Adjustment OCP(Over Current Protection) on CS Pin
OTP (Over Temperature Protection) through a NTC
OLP (Over Load Protection)
250/-500mA Driving Capability
Applications
Switching AC/DC Adaptor and Battery Charger
Open Frame Switching Power Supply
Typical Application
AC
input
EMI
Filter
DC
Output
OTP
VCC
OUT
COMP
LD5530R
CS/OVP
GND
photocoupler
Leadtrend Technology Corporation
LD5530R-DS-00 June 2013
1
www.leadtrend.com.tw
1 page  
LD5530R
Electrical Characteristics
(TA = +25C unless otherwise stated, VCC=15.0V)
PARAMETER
CONDITIONS
Supply Voltage (Vcc Pin)
Startup Current
VCC < UVLO (ON)
Operating Current
(with 1nF load on OUT pin)
VCOMP=0V
VCOMP=3V
OLP Tripped / Auto, OTP=3V
OVP Tripped / Auto, OTP=3V
OTP Pin Tripped / Latch
Holding Current
Latch-Off Release Voltage
VCC=10V (latched)
UVLO (off)
OUT OFF
UVLO (on)
VCC OVP Level
VCC OVP De-bounce time
*
VCC OSCP
COMP > 4.6V
VCC OSCP De-bounce Time
Voltage Feedback (Comp Pin)
Short Circuit Current
Open Loop Voltage
VCOMP=0V
COMP pin open
Green Mode Threshold VCOMP
*
Zero Duty Threshold VCOMP
Zero Duty Hysteresis
Current Sensing (CS/OVP pin)
Maximum Input Voltage, VCS_OFF
Max. OCP Compensation Current,
IOCP
Leading Edge Blanking Time, LEB
Internal Slope Compensation
Input impedance
*0% to DMAX. (Linearly increase)
*
Delay to Output
*
Soft Start Duration
*
Over Voltage Protection (CS/OVP pin)
OVP Trip Current Level
De-bounce Cycle
*
MIN
--
0.53
1.7
0.48
0.48
0.75
360
3.7
7.0
15
27.5
--
--
--
0.10
4.75
--
1.5
70
0.837
234
250
--
1
--
--
0.186
--
TYP
0.6
0.65
1.85
0.52
0.52
0.83
450
4.3
7.5
16
28.5
8
9
15
0.125
5
2.4
1.6
100
0.85
240
300
300
--
100
6.5
0.2
8
MAX UNITS
1 A
0.77 mA
2.1 mA
0.64 mA
0.64 mA
0.91 mA
540 A
5.1
8.0 V
17 V
29.5 V
-- cycle
-- V
-- ms
0.15 mA
5.25 V
-- V
1.7 V
130 mV
0.863
246
400
--
--
--
--
V
A
ns
mV
M
ns
ms
0.214
--
V
Cycle
Leadtrend Technology Corporation
LD5530R-DS-00 June 2013
5
5 Page 
LD5530R
Adjustable Over Current Compensation
(CS/OVP Pin)
In general, the power converter can deliver more current
at high input voltage than at low input voltage. To
compensate this, an offset voltage is added to the CS
signal by an internal current source (IOCP) and an external
resistor (ROCP) in series between the sense resistor (Rs)
and the CS/OVP pin, as shown in Fig. 17. By selecting a
proper value of the resistor in series with the CS pin, the
amount of compensation can be adjusted. The value of
IOCP depends on the duty cycle of OUT pin. The equation
of IOCP is decreased as:
(0.625 Duty) 480uA(0.125 Duty 0.625)
IOCP 0uA (Duty 0.625)
240uA (Duty 0.125)
In light load conditions, the offset should be removed
since it is in same order of magnitude as the current
sense signal. Therefore the compensation current is only
fully added when the COMP voltage is higher than 2.9V.
ROCP:470~1.2k; COCP:47pF~390pF
0.85V
OCP
Comparator
V BIAS
IOCP
Duty/VCOMP
OUT
LEB
CS/OVP
ROCP
COCP
RS
Fig. 17
Output Over Voltage Protection (CS/OVP
Pin) - Auto Recovery
An output overvoltage protection is implemented in the
LD5530R, as shown in Fig. 18 and 19. It senses the
auxiliary voltage via the divided resistors. The auxiliary
winding voltage is reflected from secondary winding and
therefore the flat voltage on the CS/OVP pin is
proportional to the output voltage. LD5530R can sample
this flat voltage level after a delay time to perform output
over voltage protection. This delay time is used to ignore
the voltage ringing from leakage inductance of PWM
transformer. The sampling voltage level is compared with
internal threshold voltage 0.2V. If the sampling voltage
exceeds the OVP trip level, an internal counter starts
counting subsequent OVP events. The counter has been
added to prevent incorrect OVP detection which might
occur during ESD or lightning events. However, when
typically 8 cycles of subsequent OVP events are detected,
the OVP circuit switches the power MOSFET off. As the
protection is auto recovery, the converter restarts after the
VCC is lower than UVLO OFF level and then recharge to
UVLO ON.
Delay
Sample
AUX
OUT
OVP
Debouce
8 cycle
0.2V
CS
ROCP
RS
Fig. 18
Out
AUX Winding
Sample
Delay
CS/OVP
Fig. 19
Leadtrend Technology Corporation
LD5530R-DS-00 June 2013
11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet LD5530R.PDF ] | |
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