RDK-239 Power Integrations, Inc., RDK-239 Datasheet

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RDK-239

Manufacturer Part Number
RDK-239
Description
Specifications: Family: Eval Boards - DC/DC & AC/DC (Off-Line) SMPS ; Series: HiperLCS™ ; Main Purpose: DC/DC, Step Down ; Outputs and Type: 1, Isolated ; Power - Output: 150W ; Voltage - Output: 24V ; Current - Output: 6.25A ; Voltage - Input:
Manufacturer
Power Integrations, Inc.
Datasheet
www.powerint.com
LCS700-708
HiperLCS
Integrated LLC Controller, High-Voltage
Power MOSFETs and Drivers
Product Highlights
Features
Applications
LLC half-bridge power stage incorporating controller, high and
low-side gate drives, and high-voltage power MOSFETs
Precise duty symmetry balances output rectifier current,
improving efficiency
Comprehensive fault handling and current limiting
Programmable dead-time for optimized design
Programmable burst mode maintains regulation at no-load and
improves light load efficiency
Programmable soft-start time and delay before soft-start
Accurate programmable minimum and maximum frequency
limits
Single package designed for high-power and high-frequency
Paired with HiperPFS PFC product gives complete, high
efficiency, low part count PSU solutions
High-efficiency power supplies (80 PLUS Silver, Gold and
Platinum)
LCD TV power supplies
LED street and area lighting
Printer power supplies
Audio amplifier
High maximum operating frequency of 1 MHz
Eliminates up to 30 external components
Nominal steady-state operation up to 500 kHz
Dramatically reduces magnetics size and allows use of
SMD ceramic output capacitors
50% ±0.3% typical at 300 kHz
Programmable brown-in/out thresholds and hysteresis
Undervoltage (UV) and overvoltage (OV) protection
Programmable over-current protection (OCP)
Short-circuit protection (SCP)
Over-temperature protection (OTP)
Reduces assembly cost and reduces PCB layout loop areas
Simple single clip attachment to heat sink
Exposed thermal pad connected to ground potential – no
insulators required between package and heat sink
Staggered pin arrangement for simple PC board routing
and high-voltage creepage requirements
Family
HV DC
Figure 1.
Output Power Table
Description
The HiperLCS is an integrated LLC power stage incorporating a
multi-function controller, high-side and low-side gate drivers,
plus two power MOSFETs in a half-bridge configuration. Figure
1 shows a simplified schematic of a HiperLCS based power stage
where the LLC resonant inductor is integrated into the transformer.
The variable frequency controller provides high efficiency by
switching the power MOSFETs at zero voltage (ZVS), eliminating
switching losses.
Input
Table 1.
Notes:
1. Maximum practical power is the power the part can deliver when properly
B+
B-
LCS700HG
LCS701HG
LCS702HG
LCS703HG
LCS705HG
LCS708HG
mounted to a heat sink and a maximum heat sink temperature of 90 °C.
Product
Standby
Supply
Output Power Table.
Typical Application Circuit – LCD TV and PC Main Power Supply.
R
R
BURST
FMAX
OV/UV
VREF
DT/BF
VCC
FB
VCCH
CONTROL
G
Maximum Practical Power
D
S1/S2
HB
IS
HiperLCS
110 W
170 W
220 W
275 W
350 W
440 W
LLC Feedback Circuit
1
June 2011
PI-6159-060211
RTN
+V

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RDK-239 Summary of contents

Page 1

LCS700-708 Family HiperLCS ™ Integrated LLC Controller, High-Voltage Power MOSFETs and Drivers Product Highlights Features LLC half-bridge power stage incorporating controller, high and • low-side gate drives, and high-voltage power MOSFETs Eliminates external components • High maximum ...

Page 2

LCS700-708 VREF 3.4 V REGULATOR + LLC_ON OV/UV VSDH/ VSDL + VOVH/ VOVL + IS VISF 7 CONSECUTIVE + LLC CLOCK CYCLES VISS VREF FEEDBACK (FB) DT/BF DEBOUNCE + 3 LLC CLOCK CYCLES Bursting Thresholds DT/BF Control RESISTOR SENSOR Figure ...

Page 3

Pin Functional Description VCC Pin IC power pin typical application, VCC is connected to the 12 V system standby supply via resistor. This resistor helps provide filtering and improves noise immunity. Note: The system standby ...

Page 4

LCS700-708 Figure 4. 150 W Laser-Jet Printer Power Supply. 4 Rev. B 062011 www.powerint.com ...

Page 5

HiperLCS Basic Operation The HiperLCS is designed for half-bridge LLC converters, which are high-efficiency resonant, variable frequency converters. The HiperLCS is an LLC controller chip with built-in drivers and half-bridge MOSFETs. LLC converters require a fixed dead-time between switching half-cycles. ...

Page 6

LCS700-708 pulse width requirement for detection of both voltage thresholds is nominally 30 ns. i.e. the thresholds have to be exceeded for >30 ns for proper detection. Over-Temperature Shutdown The HiperLCS has latching OTP. VCCH must be cycled to resume ...

Page 7

Figure 7 shows a an example of preferred routing for the optocoupler and traces connected to the FEEDBACK pin. The optocoupler is spaced away from the transformer, reducing noise pickup. The optocoupler output trace (from pin 3) is also routed ...

Page 8

LCS700-708 Small Signal Bypass Capacitors Please refer to Figure 5 Note the location of the small signal bypass capacitors (highlighted) for the FEEDBACK, DT/BF, IS, VREF, OV/UV and VCC pins, which allow short traces to their pin connections and to ...

Page 9

Bootstrap Circuit and HB Node Layout Please refer to Figure 10. Note the location of the bootstrap diode, capacitor, resistor, and the HB trace routing. The objective is to keep them away from the small signal components and traces, such ...

Page 10

LCS700-708 Figure 10. Placement of Boot Strap Diode, Capacitor, Resistor and the High-Voltage Trace Routing. Figure 11. Placement of Capacitors Between Transformer Secondary Pins and 10 Rev. B 062011 Transformer Primary High-Side Secondary Output Rectifier Capacitors Center Tap Secondary the ...

Page 11

Key Design Details The LLC converter is a variable frequency resonant converter. As input voltage decreases, the frequency must decrease in order to maintain output regulation lesser extent, as load reduces the frequency must increase. When the converter ...

Page 12

LCS700-708 Resonant Frequency The series resonant frequency is a function of L resonant capacitor. For any given value can be adjusted for the desired series resonant frequency RES f . For best efficiency the resonant frequency is ...

Page 13

OV/UV pin resistor divider chosen for minimum required LLC gain 495 V VOVH 385 V 376 V VSDH 200 V Figure 14. OV/UV Pin Voltage Thresholds, at Minimum and Maximum Divider Ratios, for 385 V Nominal Input Voltage. If the ...

Page 14

LCS700-708 450 400 350 300 250 200 150 100 200 400 Frequency (kHz) Figure 16. FEEDBACK Pin and DT/BF Pin Current vs. Frequency. For example, if BT2 is selected, and f MAX = 300 kHz, and f ...

Page 15

VREF C R START FMIN R START FB R OPTO C FB 4.7 nF GND Figure 19. Feedback Network Shown with Additional Load Resistor. start-up frequency, and f , which is the burst mode start START (lower) threshold frequency. The ...

Page 16

LCS700-708 It should be noted that the 4.7 nF decoupling capacitor, C (see Figure 19), in conjunction with the 2.5 kW input resistance presented by the FEEDBACK pin, form a pole in the LLC transfer function. This can add significant ...

Page 17

The recommended series resistor value of 220 W and the bypass capacitor form a low-pass filter, and its time constant must not cause significant attenuation of the current sense signal at the nominal operating frequency. The effect of the attenuation ...

Page 18

LCS700-708 400 300 200 100 Time ( s) Figure 26. Zoom in of Last Few Switching Cycles of Burst Pulse Train of Figure 24. The Switching Frequency of the Last Few Cycles is f This Case ...

Page 19

Absolute Maximum Ratings Instantaneous Repetitive Current .................................. V LCS700................................ ........................ 5.2 A LCS701............................. ............................7.7 A LCS702.............................. ........................ 10.3 A LCS703 ................................................. 12.9 A LCS705............................... ....................... 19.3 A LCS708............................... ....................... 30.9 A Instantaneous Repetitive Current ...

Page 20

LCS700-708 Parameter Symbol Half-Bridge (cont.) ON-State Resistance R DS(ON) Half-Bridge C Capacitance HB Diode Forward V Voltage FWD Power Supply VCC Supply V Voltage Range CC VCCH Supply V Voltage Range CCH Start-Up Current I CC(OFF) Inhibit Current I CC(INHIBIT) ...

Page 21

Parameter Symbol VCCH Supply Undervoltage Lockout VCCH Start Threshold V UVLO(H+) VCCH Shutdown V Threshold UVLO(H-) VCCH Start-Up/ V Shutdown Hysteresis UVLO(H)HYST High-Voltage Supply Undervoltage/Overvoltage Enable OV/UV Overvoltage V Shutdown Threshold OV(H) OV/UV Overvoltage V Recovery Threshold OV(L) OV/UV Undervoltage ...

Page 22

LCS700-708 Parameter Symbol LLC Oscillator (cont.) I Threshold I FB Hysteresis BURST(HYST) V BT1 DT/BF Voltage to V Program Burst Setting BT2 V BT3 Time Constant for the Combination FMAX R and the Decoup- DT/BF BURST ...

Page 23

Frequency (kHz) Figure 27. V Current vs. Frequency. CC 900 800 700 600 500 400 300 200 100 0 0 100 20 300 400 Frequency ...

Page 24

LCS700-708 24 Rev. B 062011 www.powerint.com ...

Page 25

Part Ordering Information LCS 700 www.powerint.com • Hiper Product Family • LCS Series Number • Package Identifier H Plastic eSIP-16C • Pin Finish G Halogen Free and RoHS Compliant • Tape & Reel and Other Options ...

Page 26

... The PI logo, TOPSwitch, TinySwitch, LinkSwitch, DPA-Switch, PeakSwitch, CAPZero, SENZero, LinkZero, HiperPFS, HiperTFS, HiperLCS, Qspeed, EcoSmart, Clampless, E-Shield, Filterfuse, StakFET, PI Expert and PI FACTS are trademarks of Power Integrations, Inc. Other trademarks are property of their respective companies. ©2011, Power Integrations, Inc. ...

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