1&1 DX Green Mode PWM Controller 计,外壳不需要开散热孔, … · DRV Source resistance...
Transcript of 1&1 DX Green Mode PWM Controller 计,外壳不需要开散热孔, … · DRV Source resistance...
. DXGreen Mode PWM Controller
Datasheet Rev. 3.0 - 1 -
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GENERAL DESCRIPTION The series are high performance fixed frequency for Off-Line and DC-to-DC converter
applications offering the designer a cost effective solution with minimal external components. These integrated circuits feature a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier, current sensing comparable, and a high current totem pole output ideally suited for driving a power MOSFET. Also included are protective features consisting of input and reference under voltage lockouts each with hysteria, cycle-by-cycle current limiting, programmable output dead time, and a latch for single pulse metering. Difference between members of this series is the under-voltage lockout thresholds. The has UVLO thresholds of 16 V (on) and 10 V (off), ideally suited for off-line converters. The is offered in SOP-8 and DIP-8packages.
FEATUREProprietary frequency shuffling technology for improvedEMI performance Leading edge Blanking on current sense input.Internal synchronized slope compensation.Extended burst mode control for improved efficiency andminimum standby power designLow VDD start up current and low operating current.Cycle-by-Cycle Current LimitingPower on Soft-start, Programmable CV and CCRegulationVDD under Voltage Lockout with Hysteresis (UVLO),OVP, OCP, OLP, Clamp VDDTrimmed Oscillator Discharge Current for PreciseDuty Cycle ControlAdjustable Switching Frequency up to 500 kHzInternally Trimmed Reference with under voltageLockoutHigh Current Totem Pole OutputUnder voltage Lockout with hysteresisLow Start-Up and Operating CurrentUp to 28V VCC Operation+500 mA/–800 mA Source / Sink Capability
TYPICAL APPLICATIONS Power Supplies for PC Silver BoxesTV/Set-Top Box Power SuppliesBattery ChargerFlyback and Forward Converter
ORDERING INFORMATION
Part Number Package Type Production Flow
. DX SOP-08L -40 C to +85 C*
*Design Guarantee: The device is guaranteed to meet the specifications from 0 C to 70 C. Specifications over the –40 C to 85 C operatingtemperature range are assured by design, characterization and correlation with the statistical process controls
OFFLINE CONTROLLER
PIN CONNECTIONS
1
MARKING DIAGRAM
Specific Device Code
DX: Assembly Location
XX: Year
XX: Work Week
电动车充电方案NCN5201DX,MAX:70V3A,无风扇设计,外壳不需要开散热孔,效率90,咨询186 8245 1525
. DXGreen Mode PWM Controller
Datasheet Rev. 3.0 - 2 -
TYPICAL APPLICATION SCHEMATIC
BLOCK DIAGRAM
. DXGreen Mode PWM Controller
Datasheet Rev. 3.0 - 3 -
PIN FUNCTION DESCRIPTION Pin No. Function Description
1 GND Connect this pin to the pre converter ground.
2 CS Monitors the primary current and allows the selection of the ramp compensation amplitude.
3 RT A resistor connected to ground fixes the switching frequency.500 kHz is possible.
4 DRV This pin connects to the MOSFET gate
5 GND The controller ground pin
6 VCC DC power supply pin
7 PG_OK/REF5V
The Pin voltage is high (5 V) when the PWM stage is in a normal, steady state situation and low otherwise. This signal serves to “inform” the downstream converter that the PFC stage is ready and that hence, it can start operation.
8 FB Feedback input pin. PWM duty cycle is determined by voltage level into thispin and current-sense signal level at Pin 2.
ABSOLUTE MAXIMUM RATINGSRating Symbol Value Unit
Total Power Supply and Zenger Current (ICC+IZ) 30 mAPower Supply voltage, VCC pin voltage Vcc 28 VOutput Current, Source or Sink (Note 1) IO 1 AOutput Energy (Capacitive Load per Cycle) w 5 uCurrent Sense and Voltage Feedback Inputs Vin -0.3 to +5.5 VMaximum Power Dissipation @ TA=25°C PD 862 mWThermal Resistance Junction to Air R JA 1 °C/Maximum Power Dissipation @ TA=25°C PD 1.25 WThermal Resistance Junction to Air R JA 1 °C/Operating Junction Temperature TJ +150 °CLead Temperature (Soldering, 10sec) TLEAD +300 °CStorage Temperature Range Tstg -65 to + 150 °C
ELECTRICAL CHARACTERISTICS (VCC=15V, RT=10k, CT=3.3nF, TA=TLOW to THIGH
Parameter Symbol Conditions Min. Typ. Max. UnitFEEDBACK SECTION
Open loop feedback voltage FB pin=open VFBOL - 5 - V
FB pin maximum current FB Pin= GND IFB 1 mA
ZFB_IN -- Input Impedance 10 KInternal Diode forward voltage -- Vf 0.75 V
. DXGreen Mode PWM Controller
Datasheet Rev. 3.0 - 4 -
CURRENT SENSE SECTIONGain GV -- 2.85 3 3.15 V/VCurrent Sense Voltage Threshold VI(MAX) VILIM 0.9 1 1.1 VPower Supply Rejection Ratio PSRR 25V - 70 - dBInput Bias Current IBIAS - - -3 -10 APropagation Delay (Current Sense Input to gate turned off) - tILIM - 150 300 ns
OSCILLATOR SECTION Oscillator Frequency f TJ = 25 C 47 52 57 kHzFrequency Change with Voltage 25V 0.05 1 %Oscillator Amplitude VOSC 1.6 VP-PMaximum operating frequency f 500 kHz
PWM SECTIOND(Max) 76 80 84 %
PGOK/REF5V Line Regulation PG 25V - 6 20 mV
VPG OKH PG VREF TJ = 25 C, IREF = 1mA 4.9 5 5.1 V Icap_ref - 5 10 - mA
DRIVE OUTPUTISINK = 20mA - 0.08 0.4 VLow Output Voltage
VOL
ISINK = 200mA - 1.4 2.2 VISOURCE = 20mA 13 13.5 - V
High Output Voltage VOH
ISOURCE = 200mA 12 13.0 VRise Time tR TJ = 25 C, CL= 1nF - 45 150 ns Fall Time tF TJ = 25 C, CL= 1nF - 35 150 ns
DRV Source resistance RSRC - 10 30DRV Sink resistance RSINK 6 19
SUPPLY SECTION AND VCC MANAGEMENTStartup threshold at which driving pulses are authorized
VCC increasing
VCC(on) 14.5 16 17 V
Min. Operating Voltage (After Turn On)
VCC decreasing
VCC(off) 8.5 10 11.5 V
Hysteresis between VCC(on) and VCC(min)
VCC(HYS) - 6 - V
TOTAL STANDBY CURRENTStart-Up Current IST - - 0.45 1 mA
Operating Supply Current ICC(OPR) Vpin3=Vpin2=ON - 14 17 mA
Tthat is synchronized with the PWM clock to the control voltage, the I perturbation will decrease to zero on succeeding cycles. This compensation ramp(m3) must have a slope equal to or slightly greater than m2/2 for stability. With m2/2 slope compensation, the average inductor current follows the control voltage yielding true current mode operation. The compensating ramp can be derived from the oscillator and add to either the Voltage Feedback or Current Sense inputs .
. DXGreen Mode PWM Controller
first case, Pin7 is in high state and lowotherwise.
Datasheet Rev. 3.0 - 5 -
APPLICATION INFORMATIONIntroduction
The hosts a high performance current
mode controller specifically developed to drive
power supplies designed for the ATX and the
adapter market:
Current Mode operation: implementing peak
current mode control topology, the circuit offers
supplies.
Adjustable switching frequency: a resistor
to ground precisely sets the switching frequency
between 50 kHz and a maximum of 500 kHz.
There is no synchronization capability.
Internal frequency jittering: Frequency
jittering softens the EMI signature by spreading out peak energy within a band 5% from the
center frequency.
Wide Vcc excursion: the controller allows
operation up to 28 V continuously and accepts
transient voltage up to 30 V during 10 ms with
IVCC < 20 mA.
standby power represents a difficult exercise
when the controller requires an external, lossy,
resistor connected to the bulk capacitor. The
to be less than
100 _A maximum, helping the designer to reach
a low standby power level.
Shutdown: if an external transistor brings the
FB pin down, the controller is shut down, but all
internal biasing circuits are alive. When the pin is
released, a
Internal ramp compensation: a simple
resistor connected from the CS pin to the sense
resistor allows the designer to inject ramp
compensation inside his design.
PG_ OK REF: the circuit detects when the
circuit it is in a startup or fault condition. In the
Pin7 serves to control the downstream converter operation in response to the PFC state.
Current Sensing and leading edge blankingCycle-by-Cycle current limiting is offered in
current mode PWM control. The switch current is detected by a sense resistor into the sense pin. An internal leading edge blanking circuit chops off the sense voltage spike at initial MOSFET on state due to snubber diode reverse recovery so that the external RC filtering on sense input is no longer required. The current limit comparator is disabled and thus cannot turn off the external MOSFET during the blanking period. PWM duty cycle is determined by the current sense input voltage and the FB input voltage.
: Thehigh to permit a large energy storage in a small VCC capacitor value. This helps to operate with a
together with a small VCC capacitor, will not hamper the To further reduce the standby power, the current of the controller is extremely low, below 15 m refore beconnected to the bulk capacitor or directly to the mains input voltage to further reduce the power dissipation. The first step starts with the calculation of the VCC capacitor which will supply the controller when it operates until the auxiliary winding takes over. Experience shows that this time t1 can be between 5 ms and 20 ms. If we consider we need at least an energy reservoir for a t1 time of 10 ms, the VCC capacitor must be larger than:
Let us select a 4.7 _F capacitor at first and we were too optimistic for the time t1. The VCC capacitor being known, we can now evaluate the charging current we need to bring the VCC voltage from 0 to
. DXGreen Mode PWM Controller
Datasheet Rev. 3.0- 6 -
the VCCon of the IC, 18V typical. This current
e
lowest mains (85 V rms) to be less than 3 s (2.5 s
for design margin):
If we account for the 15uA that will flow inside
the controller, then the total charging current
delivered by the uA.
network to the mains
that the
will be the smallest when VCC reaches the
VCCon of the controller:
To make sure this current is always greater than
49uA,
be extracted:
This calculation is purely theoretical, and
assumes a constant charging current. In reality,
the take over time can be shorter (or longer!) and
it can lead to a reduction of the VCC capacitor.
Hence, a decrease in charging current and an
sistor, thus reducing
the standby power. Laboratory experiments on
the prototype are thus mandatory to fine tune the
converter. If we chose the 413k resistor as
suggested by Equation 4, the dissipated power
at high line amounts to:
(eq.5)
Now that the first VCC capacitor has been
selected, we
not disappear when in
deep that
refreshing pulses are likely to be widely spaced,
inducing a large ripple on the VCC capacitor. If this
ripple is too large, chances exist to touch the VCC
min and reset the
sequence. A solution is to grow this capacitor but it
will obviously be detrimental to the
The option offered in Figure 1 elegantly solves this
potential issue by adding an extra capacitor on the
auxiliary winding. However, this component is
separated from the VCC pin via a simple diode.
You therefore have the ability to grow this capacitor
as you need to ensure the
controller without jeopardizing the
and standby power. A capacitor ranging from 22 to
47uF is the typical value for this device. One note
on the start-up current. If educing it helps to
improve the standby power, its value cannot fall
below a certain level at the minimum input voltage.
Failure to inject enough current (30uA) at low line
will turn a converter in fault into an auto-recovery
mode since the SCR won’t remain latched. To build
a sufficient design margin, we recommend to keep
at least 60uA flowing at the lowest input line (80
Vrms for 85V minimum for instance).
. DXGreen Mode PWM Controller
Datasheet Rev. 3.0 - 7 -
Auto :
supply experiences a severe overloading
situation, an internal error flag is raised and
starts a countdown timer. If the flag is asserted
longer than 100ms, the driving pulses are
stopped and the VCC pin slowly goes down to
around 10V. At this point, the controller
due to
the resistive starting network. When VCC
reaches VCCon, the controller attempts to
absence of the fault. If
the fault is still there, the supply enters another
If the fault has
cleared, normal operation.
Slope Compensation: The includes an internal ramp
compensation signal. This is the buffered
oscillator clock delivered only during the on time.
Its amplitude is around 5V at the maximum
means
used to cure sub harmonic oscillations in
Continuous Conduction Mode (CCM) operated
signal will be disconnected from the CS pin,
Current mode converters. These oscillations take
place at half the switching frequency and occur
only during CCM with a
50%. To lower the current loop gain, one usually
injects between 50% and 100% of the inductor
downslope. Figure 3 depicts how internally the
ramp is generated. Please note that the ramp
during the off time.
Figure 2. ated for Faults Longer than 100 ms
Figure 1. The Startup Resistor Can Be Connected to the Input Mains for Further Power
. DXGreen Mode PWM Controller
Oscillator timing capacitor, CT, is chargedby
Datasheet Rev. 3.0 - 8 -
In the E controller, the oscillator ramp features a
clock operates at a 65kHz frequency, then the
available oscillator slope corresponds to:
In our flyback design, let’s assume that our
primary inductance Lp is 770uH, and the SMPS
delivers 19V with a Np:Ns ratio of 1:0.25. The
Sp is thus given
by:
(eq.7)
Given a sense resistor of 330m , the above
current ramp turns into a voltage ramp of the
following amplitude:
Slope Compensation:
(eq.8)
If we select 50% of the downslope as the required
amount of ramp compensation, then we shall inject
a ramp whose slope is 17 mV/_s. Our internal
compensation being of 208 mV/_s, the divider ratio
(divratio) between Rcomp and the internal 20k
resistor is:
The series compensation resistor value is thus:
(eq.10)
A resistor of the above value will then be inserted
from the sense resistor to the current sense pin.
We recommend adding a small capacitor of 100
pF, from the current sense pin to the controller
ground for an improved immunity to the noise.
Please make sure both components are located
very close to the controller.
Figure 3. Inserting a Resistor in Series with the Current Sense Information Brings Ramp Compensation and
(eq.6)
(eq.9)
. DXGreen Mode PWM Controller
Datasheet Rev. 3.0 - 9 -
PG_Vref through RT and discharged by an
internal current source. During the discharge
time, the internal clock signal blanks the output
to the low state. Selection of RT and CT
therefore determines both oscillator frequency
and maximum duty cycle. Charge and discharge
times are determined by the formulas:
tc = 0.55 RT CT
.
(eq.11)
Frequency, then, is: f=(tc + td)-1
(eq.12)
Figure 4. Oscillator Dead Time & Frequency
在现有的PCBA上,改动IC和IC周边几个电阻和电容即可实现。
联系人: 赖生电 话 : 186 8245 1525 QQ/微信:896 3737 11
电动车充电方案NCN5201DX,MAX:70V3A,无风扇设计,外壳不需要开散热孔,效率90。
注:MAX70V 10A的即将上市,敬请期待
. DXGreen Mode PWM Controller
Datasheet Rev. 3.0- 10 -
PACKAGE OUTLINES
PACKAGE DIMENSIONSSOP 8
Small Outline PackageUNIT : inch
. DXGreen Mode PWM Controller
Datasheet Rev. 3.0- 11 -
Shipping packingSOP-8 tape & Reel:
1Pc / device
2500 devices / Reel
12 Reel / Carton(30,000Pcs / Carton)
Label Label
. DXGreen Mode PWM Controller
Datasheet Rev. 3.0 - 12 -
EMBOSSED TAPE AND REEL DATA CARRIER TAPE SPECIFICATIONS
DIMENSIONS
Tape B1 Max
(Note 1)D D1 E F K P0 P2 R Min T Max W Max
4.55 mm 1.5 + 0.1 mm 1.0 Min 1.75 0.1 mm 3.5 0.05 mm 2.4 mm 4.0 0.1 mm 2.0 0.1 mm 25 mm 0.6 mm 8.3 mm0.0 (0.039 ) (0.069 (0.138 Max (0.157 (0.079
(0.059 + or0.004 0.5 mm
Min
8 mm (0.179 )
(0.020 )
0.002 ) (0.094 )(0.98 ) (0.327 )
8.2 mm 1.5 mm 5.5 0.05 mm 6.4 mm 30 mm 12 0.30 mmMin (0.217 Max (0.470 12 mm (0.323 )
0.002 ) (0.252 ) 0.012 )
12.1 mm 7.5 0.10 mm 7.9 mm 16.3 mm(0.295 Max16 mm (0.476 )0.004 ) (0.311 )
(0.642 )
20.1 mm 11.5 0.1 mm 11.9 mm 24.3 mm(0.453 Max24 mm (0.791)
0.0)
(0.060 )
0.004 )
0.004 ) (0.468 )
0.004 ) 0.002 )
(1.18 )
(0.024 )
(0.957 )
. DXGreen Mode PWM Controller
Datasheet Rev. 3.0 - 13 -
REEL DIMENSIONS
A B C
Reel Tape Min Max Min Max Min Max
D E
178.0 (7.01) 16.0 (0.63) 50.0 (1.97) 6.5 (0.26) 7.5 (0.30) 16.4 (0.65) 18.4 (0.72) 22.4 (0.88) 19.4 (0.76)
330.0 (12.99) 12.0 (0.47) 178.0 (7.01) 4.5 (0.18) 5.5 (0.22) 12.4 (0.49) 14.4 (0.57) 18.4 (0.72) 15.4 (0.61)
330.0 (12.99) 56.0 2.20 150.0 (5.91) 10.0 (0.39) 11.0 (0.43) 56.4 (2.22) 58.4 (2.30) 62.4 (2.46) 59.4 (2.34)
330.0 (12.99) 44.0 (1.73) 100.0 (3.94) 10.0 (0.39) 11.0 (0.43) 44.4 (1.75) 46.4 (1.83) 62.4 (2.46) 47.4 (1.87)
330.0 (12.99) 32.0 (1.26) 100.0 (3.94) 10.0 (0.39) 11.0 (0.43) 32.4 (1.28) 34.4 (1.35) 38.4 (1.51) 35.4 (1.39)
330.0 (12.99) 24.0 (0.94) 60.0 (2.36) 9.5 (0.37) 10.5 (0.41) 24.4 (0.96) 26.4 (1.04) 30.4 (1.51) 27.4 (1.08)
330.0 (12.99) 16.0 (0.63) 6.5 (0.26) 7.5 (0.30) 16.4 (0.65) 18.4 (0.72) 22.4 (0.88) 19.4 (0.76)
330.0 (12.99) 12.0 (0.47) 4.5 (0.18) 5.5 (0.22) 12.4 (0.49) 14.4 (0.57) 18.4 (0.72) 15.4 (0.61)
330.0 (12.99) 8.0 (0.31) 50.0 (1.97) 2.5 (0.10) 3.5 (0.14) 8.4 (0.33) 9.9 (0.39) 14.4 (0.57) 10.9 (0.43)
178.0 (7.01) 12.0 (0.47) 50.0 (1.97) 4.5 (0.18) 5.5 (0.22) 12.4 (0.49) 14.4 (0.57) 18.4 (0.72) 15.4 (0.61)
178.0 (7.00) 8.0 (0.31) 50.0 (1.97) 2.5 (0.10) 3.5 (0.14) 8.4 (0.33) 9.9 (0.39) 14.4 (0.47) 10.9 (0.43)
330.0 (12.99) 8.0 (0.31) 50.0 (1.97) 4.0 (0.16) 5.0 (0.20) 8.4 (0.33) 9.9 (0.39) 14.4 (0.57) 10.9 (0.43)
178.0 (7.00) 8.0 (0.31) 50.0 (1.97) 4.0 (0.16) 5.0 (0.20) 8.4 (0.33) 9.9 (0.39) 14.4 (0.57) 10.9 (0.43)