LD9704R [LEADTREND]
Green-Mode PWM Controller with Frequency Swapping with protections and MOSFET Integrated;
| 型号： | LD9704R |
| 厂家： | 
Leadtrend Technology |
| 描述： | Green-Mode PWM Controller with Frequency Swapping with protections and MOSFET Integrated |
| 文件： | 总14页 (文件大小：699K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LD9704R
03/15/2017
Green-Mode PWM Controller with Frequency Swapping
with protections and MOSFET Integrated
REV. 00
General Description
Features
The LD9704R is built-in with several functions, protection
and EMI-improved solution within a 680V MOSFET in a
DIP-6 package. It takes less components counts or circuit
space, especially ideal for those total solutions of low
cost.
Built-in 680V Power MOSFET
Fixed Switching Frequency at 130KHz
Very Low Startup Current (<3A)
Current Mode Control
Green Mode Control
UVLO (Under Voltage Lockout)
The implemented functions include low startup current,
green-mode power-saving operation 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.
Internal Frequency Swapping, Slope Compensation
OVP (Over Voltage Protection) on VCC Pin
Built in OCP(Over Current Protection) Compensation
OTP (Over Temperature Protection) through a NTC
OLP (Over Load Protection)
Furthermore, the Frequency Swapping function can
reduce the noise level and thus help the power circuit
designers to easily deal with the EMI filter design by
spending minimum amount of component cost and
developing time.
Applications
Switching AC/DC Adaptor and Battery Charger
Open Frame Switching Power Supply
Typical Application
DC
Output
AC
input
EMI
Filter
VCC
OTP
DRAIN
CS
LD9704R
photocoupler
COMP
GND
1
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03/15/2017
Pin Configuration
DIP-6 (TOP VIEW)
8
6
5
YY:
WW:
PP:
Year code
Week code
Production code
TOP MARK
YYWWPP
1
2
3
4
Ordering Information
Part number
Package
Top Mark
Shipping
3600 /tube /Carton
LD9704RGP7
DIP-6
LD9704RGP7
The LD9704R is ROHS compliant / Green Packaged
Protection Mode
Switching Freq.
OLP
VCC OVP
Auto recovery
OTP Pin
Output Short
130kHz
Auto recovery
Latch
Auto-restart by OLP
Pin Descriptions
DIP-6
NAME
FUNCTION
Pull this pin below 0.95V to shut down the controller into latch mode until the
AC resumes power-on. Connecting this pin to ground with NTC will achieve
1
OTP
OTP protection. Let this pin float or connect a 100k resistor to disable the
latch protection.
Voltage feedback pin. Connect a photo-coupler to close the control loop and
2
COMP
achieve the regulation.
3
4
GND
CS
Ground
Source terminal of the internal power MOSFET and Current sense pin
5,6
7
DRAIN
NC
Drain terminal of the internal power MOSFET
NC
8
VCC
Supply voltage pin
2
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LD9704R-DS-00 Match 2017
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03/15/2017
Block Diagram
VCC
DRAIN
UVLO
Comparator
VBIAS
internal bias &
Vref
VUVLO(ON)
/
VUVLO(OFF)
OVP
OVP
Comparator
PG
Int.OSC
VCC-OVP
Protection
PG
Vg,clamp=13V
Driver
Stage
Green-Mode
Control
VCOMP_OPEN
S
Q
CS
PWM
Comparator
COMP
1.5R
R
R
VCS
Slope
Compensation
Leading Edge
Blanking
VCS
OCP
Comparator
VCS_off
+
-
Int. OTP
OLP Delay
Counter
OVP
PG
VCOMP_OLP
OLP
Comparator
OLP
VBIAS
Protection
Shutdown
Logic
Int. OTP
GND
100uA
SET
S
R
Q
Protection/Latch
Ext. OTP
PG
OTP
+
-
CLR
Q
1.05V/0.95V
PDR
3
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LD9704R-DS-00 Match 2017
LD9704R
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Absolute Maximum Ratings
Supply Voltage VCC
-0.3V ~ 30V
-0.3V ~ 6V
-0.3V ~ 680V
45mJ
COMP, CS, OTP
DRAIN
Avalanche Energy (L=10mH, IAS=3A ) on absolute maximum rating)
Maximum Junction Temperature
150C
Storage Temperature Range
-65C ~ 150C
80C/W
Package Thermal Resistance (DIP-6/7, θJA)
Package Thermal Resistance (DIP-6/7, θJc)
Power Dissipation (DIP-6/7, at Ambient Temperature = 25C)
Lead temperature (Soldering, 10sec)
30C/W
1250mW
260C
ESD Voltage Protection, Human Body Model (DRAIN pin is exclusive)
ESD Voltage Protection, Machine Model (DRAIN pin is exclusive)
2.5 KV
250 V
Caution:
Stress exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stress above Recommended Operating Conditions may affect
device reliability
Recommended Operating Conditions
Item
Operating Junction Temperature
Min.
-40
8.5
4.7
750K
1
Max.
125
26.5
10
Unit
C
V
Supply VCC Voltage
VCC Capacitor
F
Start-up resistor Value (AC Side, Half Wave)
COMP Pin Capacitor
2.4M
10
nF
Ω
Current Sense Impedance
Snubber Capacitor between Drain and CS pin
0.52
-
-
100
pF
Note:
1. It’s essential to connect VCC pin with a SMD ceramic capacitor (0.1F ~ 0.47F) to filter out
the undesired switching noise for stable operation. This capacitor should be placed close to
IC pin as possible
2. It’s also essential to connect a capacitor to COMP to filter out the undesired switching noise
for stable operation.
3. The small signal components should be placed close to IC pin as possible.
4
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LD9704R-DS-00 Match 2017
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Electrical Characteristics
(TA = +25C unless otherwise stated, VCC=15.0V)
PARAMETER
Supply Voltage (VCC Pin)
Startup Current
CONDITIONS
SYM.
MIN
TYP
MAX
UNITS
VCC < UVLO(ON)
VCOMP=3V
ICC_ST
ICC_OP1
ICC_OP2
ICC_OPA
ICC_OPL1
1.5
2.5
3
A
mA
mA
A
3.5
0.5
VCOMP=0V
0.35
600
OLP/OVP Tripped / Auto
*; OTP Pin Tripped
Latch, VCC=7V
OTP Pin Tripped / Latch
VCC=5V
Operating Current
/
(with 1nF load on DRAIN pin)
430
40
500
60
A
A
ICC_OPL2
Latch-Off Release Voltage
UVLO(OFF)
VCC_PDR
VCC_OFF
VCC_ON
3.6
7.0
15
4.5
7.5
16
5.2
8.0
17
V
V
OUT OFF
UVLO(ON)
V
VCC OVP Level
VCC_OVP
TD_VCCOVP
28.5
8
V
VCC OVP De-bounce time*
Voltage Feedback (Comp Pin)
Short Circuit Current
cycle
VCOMP=0V
ICOMP
VCOMP_OPEN
VN
0.125
3
mA
V
Open Loop Voltage
COMP pin open
*; COMP pin
*; COMP pin
2.75
3.25
Normal Mode Threshold
Green Mode Threshold
Zero Duty Threshold VCOMP
Zero Duty Hysteresis
Current Sensing (CS pin)
Maximum Input Voltage, VS_OFF
Maximum Input Voltage, VS_OFF
Min. on Time
1.2
1
V
VG
V
VZDC
0.6
100
V
VZDCH
mV
*;Duty=50%
Duty=25%
*
VCS_50%
VCS_25%
TLEB
0.60
0.50
400
V
V
ns
Internal Limited Vcs level
*; When VCS>Vcs,limit, gate
VCS_LIMIT
1.2
V
off immediately
Internal Slope Compensation*
*; 0% to DMAX. (Linearly
VSLP_L
300
mV
increase)
Input impedance
Delay to Output
Soft Start Duration
*
*
*
ZCS
TPD
TSS
1
M
ns
100
7
ms
5
Leadtrend Technology Corporation www.leadtrend.com.tw
LD9704R-DS-00 Match 2017
LD9704R
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(TA = +25C unless otherwise stated, VCC=15.0V)
PARAMETER
CONDITIONS
SYM.
MIN
TYP
MAX
UNITS
Oscillator for Switching Frequency
Frequency, FREQ
FSW
120
130
28
140
kHz
kHz
Green
Mode
Frequency,
FSW_GREEN
FREQG
Frequency Swapping
Temp. Stability*
VCOMP>2.575V
FSW_MOD
FSW_TS
FSW_VS
6
5
%
%
%
*
0
0
Voltage Stability*
*; (VCC=11V-25V)
1
Max. Duty
80
%
MXD
OLP (Over Load Protection)
OLP Trip Level
VCOMP_OLP
TD_OLPSS
2.6
V
OLP Delay Time at start-up*
OLP + Soft start
71.5
ms
OTP Pin Latch Protection (OTP Pin)
OTP Pin Source Current
IOTP
VOTP_ON
VOTP_OFF
ROTP
90
1.0
0.9
100
1.05
0.95
9.5
110
1.1
1.0
A
V
OTP Turn-On Trip Level
OTP Turn-Off Trip Level
V
OTP Turn-Off Trip Resistance
OTP pin de-bounce time
Internal OTP Protection
OTP Level
*; VOTP_OFF/IOTP
k
s
VCOMP > 3V
TD_OTP
500
*
*
TUP_OTP
140
15
℃
℃
OTP Hysteresis
TINOTP_HYS
Electrical Characteristics for MOSFET
(TA = +25oC)
PARAMETER
CONDITIONS
SYMBOL
MIN
TYP
MAX
UNITS
Drain to Source Breakdown Voltage
Breakdown Voltage BVDSS
Vcc=0V,COMP=0V,
BVDSS
680
V
ID=250A
Drain Current
Continuous Drain Current
*; Vcc=15V,COMP=2V
ID
3
A
Drain on Resistance
D to S pin On-Resistance
*: Guaranteed by design.
ID=1.5A;VCC=15V;
RDSON
2.4
2.8
6
Leadtrend Technology Corporation www.leadtrend.com.tw
LD9704R-DS-00 Match 2017
LD9704R
03/15/2017
Typical Performance Characteristics
7
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LD9704R-DS-00 Match 2017
LD9704R
03/15/2017
8
Leadtrend Technology Corporation www.leadtrend.com.tw
LD9704R-DS-00 Match 2017
LD9704R
03/15/2017
Application Information
Operation Overview
supply current. Lower startup current requirement on
the PWM controller will help to increase the value of R1
and then reduce the power consumption on R1. By
using CMOS process and the special circuit design, the
maximum startup current for LD9704R is under 3A.
The L9704R meets the green-power requirement with a
680V MOSFET driver and is intended for the use in
those modern switching power suppliers and adaptors
which demand higher power efficiency and
power-saving. It integrated more functions to reduce the
external components counts and the size. Its major
features are described as below.
If a higher resistance value of the R1 is chosen, it will
usually take more time to start up. To carefully select the
value of R1 and C1 will optimize the power consumption
and startup time.
Under Voltage Lockout (UVLO)
An UVLO comparator is implemented in it to detect the
voltage on the VCC pin. It would assure the supply
voltage enough to turn on the LD9704R PWM controller
and further to drive the power MOSFET. As shown in
Fig. 11, a hysteresis is built in to prevent the shutdown
from the voltage dip during startup.
EMI
Filter
AC
input
Cbulk
D1
C1
R1
VCC
DRAIN
Vcc
LD9704R
CS
UVLO(on)
UVLO(off)
GND
Fig. 12
t
I(Vcc)
operating current
(~ mA)
Current Sensing and Leading-edge
Blanking
startup current
(~µA)
The typical current mode of PWM controller feedbacks
both current signal and voltage signal to close the
control loop and achieve regulation. The LD9704R
detects the internal MOSFET current from the CS pin
and pulse-by-pulse limited current. The maximum
voltage threshold of the current sensing pin is Vcs_off.
t
Fig. 11
Startup Current and Startup Circuit
The typical startup circuit to generate VCC of the
LD9704R is shown in Fig. 12. During the startup
transient, the VCC is below UVLO threshold. Before it
has sufficient voltage to develop OUT pulse to operation,
R1 will provide the startup current to charge the
capacitor C1. Once VCC obtain enough voltage to turn
on the LD9704R and it’s working condition, it will enable
the auxiliary winding of the transformer to provide
Due to integrated leading edge blanking circuit and
internal spike filter, the MOSFET peak current can be
obtained from the equation as follows:
VCS _ OFF
IPEAK (MAX )
RS
9
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LD9704R-DS-00 Match 2017
LD9704R
03/15/2017
In general, the power MOSFET peak current is various
in corresponding to AC input voltage. To compensate it,
LD9704R will change the current limit Vcs_off with the
duty cycles. Please refer to Fig. 13
conditions. The green-mode control is Leadtrend
Technology’s own property. Please refer to Fig. 14
Fs
130kHz
VCS_OFF (V)
0.80V
0.60V
28kHz
V
COMP
0.6V
1V
1.2V
0.50V
Fig. 14
On/Off Control
25%
50%
80%
Duty
The LD9704R can be turned off by pulling COMP pin
lower than 0.6V. The DRAIN pin of the LD9704R will be
disabled immediately under such condition. The
off-mode can be released when the pull-low signal is
removed.
Fig. 13
Voltage Feedback Loop
The voltage feedback signal is provided from the TL431
at the secondary side through the photo-coupler to the
COMP pin of the LD9704R.it would carry a diode
voltage offset at the stage to feed the voltage divider at
the ratio, that is,
Internal Slope Compensation
In the conventional applications, the problem of the
stability is a critical issue for current mode controlling,
R
when it operates over 50% duty-cycle. As UC384X, It
takes slope compensation from injecting the ramp signal
of the RT/CT pin through a coupling capacitor. It
therefore requires no extra design for the LD9704R
since it has integrated it already.
V(PWM
(VCOMP )
)
COMPARATOR
1.5R R
A pull-high resistor is embedded internally and can be
eliminated externally.
Oscillator and Switching Frequency
Over Load Protection (OLP) - Auto
Recovery
The LD9704R is implemented with Frequency
Swapping function which helps the power supply
designers to both optimize EMI performance and lower
system cost. The switching frequency substantially
centers at 130KHz, and swap between a range of ±
6KHz.
To protect the circuit from damage in over-load
condition and short or open-loop condition, the
LD9704R is implemented with smart OLP function. It
also features auto recovery function; see Fig. 15 for the
waveform. In case of fault condition, the feedback
system will force the voltage loop toward the saturation
and then pull the voltage high on COMP pin (VCOMP).
When the VCOMP ramps up to the OLP threshold of 2.6V
and continues over OLP delay time, the protection will
Green-Mode Operation
By using the green-mode control, the switching
frequency can be reduced under the light load condition.
This feature helps to improve the efficiency in light load
10
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ID
be activated and then turn off the gate output to stop the
switching of power circuit.
VGS5 > VGS4 > VGS3 > VGS2 > VGS1
Ohmic Region Saturation Region
VGS5
With the protection mechanism, the average input
power will be minimized to remain the component
temperature and stress within the safe operating area.
VGS4
VGS3
VCC
VGS2
VGS1
UVLO(on)
UVLO(off)
Cut-off region
VDS
Fig. 16
OLP
UVLO(off)
OLP Reset
t
OTP Pin --- Latched Mode Protection
COMP
OLP delay time
The OTP circuit is implemented to sense whether there
is any hot-spot of power circuit like power MOSFET or
output rectifier. Once an over-temperature condition is
detected, the OTP is enabled to shut down the controller
OLP
OLP trip Level
t
to protect the controller. Typically,
recommended to connect with OTP pin.
a
NTC is
OUT
The NTC resistance will decrease as the device or
ambient in high temperature. The relationship is as
below.
Switching
Non-Switching
Switching
t
Fig. 15
VOTP=100μA X RNTC
Over Voltage Protection (OVP) on VCC -
Auto Recovery
When the VOTP is lower than the defined voltage
threshold (typ. 0.95V), the LD9704R will shut down the
gate output and latch off the power supply. There are 2
conditions required to restart it successfully. First, cool
down the circuit so that NTC resistance will increase
and raise VOTP up above 1.05V. Then, remove the AC
power cord and re-plug AC power.
The Vcc OVP function of LD9704R is in auto recovery
mode. As soon as the voltage of the Vcc pin rises above
OVP threshold, the output gate drive circuit will be
shutdown simultaneous to turn off the power MOSFET.
MOSFET Characteristic
The MOSFET is divided into three operation regions,
ohmic region, saturation region, and the cut-off region,
shown as Fig. 16.
Layout Guide
For PCB layout, please check spike on CS pin. This
measurement method is between GND and CS pin to
check positive and negative voltage. Suggest Vcs spike
must be is under 0.2V at minimum load and 0.6V at full
load after LEB time (~300nS). Moreover, Check
negative voltage is not still lower than -2V in 200nS time
continued.
For switching power supply applications, it shall operate
in ohmic and cut-off region. Never reach the region of
saturation; it would cause damage for acting beyond the
maximum safety operating area. It’s necessary to check
the characteristic of MOSFET.
11
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LD9704R-DS-00 Match 2017
LD9704R
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(4)
(2)
VCC
OUT
Layout Guide
(4) ß (3)ß (2)ß (1)
LD9704R
CS
This spike voltage is
lower than VCOMP8/4
after LEB period.
GND
(3)
(1)
The negative spike exceeds -2.0V in 200nS continued
Fig. 17
12
Leadtrend Technology Corporation www.leadtrend.com.tw
LD9704R-DS-00 Match 2017
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03/15/2017
Package Information
DIP-6
S
Dimension in Millimeters
Dimensions in Inches
Symbol
Min
Max
Min
Max
9.017
10.160
0.355
0.400
A
B
C
D
E
F
H
I
6.100
3.300
0.356
1.143
2.480
3.170
2.921
7.366
0.246
0.381
7.493
2.920
6.273
6.600
4.320
0.584
1.778
2.600
3.600
3.810
7.874
0.305
0.540
8.255
3.100
6.427
0.240
0.130
0.014
0.045
0.098
0.125
0.115
0.290
0.010
0.015
0.295
0.115
0.247
0.260
0.170
0.023
0.070
0.102
0.142
0.150
0.310
0.012
0.021
0.325
0.122
0.253
J
K
L
M
P
S
Important Notice
Leadtrend Technology Inc. reserves the right to make changes or corrections to its products at any time without notice. Customers should
verify the datasheets are current and complete before placing order.
13
Leadtrend Technology Corporation www.leadtrend.com.tw
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Revision History
REV. Date
Change Notice
00
03/15/2017 Original Specification.
14
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