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CM6900G
Resonant Controller
GENERAL DESCRIPTION
CM6900G is resonant controller tailor for series topology with synchronous operation to achieve high efficiency to meet today's power need. It is used for DC-DC conversion in the offline application. Light load regulation is accomplished by transitioning the controller from frequency modulation mode into PWM mode.
FEATURES
Supply Voltage Range : 10V to 15V. Typical Peak Drive from 12V supply : (PMOS~200 ohm and NMOS~100 ohm). UVLO=13V with 3V Hystetesis. Reference OK Comparator. FM/PWM Mode Operation. Softstart Capability with Shutdown Function. Latch or Auto-Restart during Current Limit or OVP.
APPLICATIONS
DC-DC Power Supply. LED Lighting Power Supply Server Power Industrial Power Supply High Power Adaptor
CM6900G Pin Configuration
ORDERING INFORMATION
Part Number
CM6900GIS *Note: G : Suffix for Pb Free Product
Temperature Range
-40 to 125
Package
16-Pin SOIC (S016)
2007/11/22 Rev1.0
Champion Microelectronic Corporation
Page 1
CM6900G
Resonant Controller
TYPICAL APPLCATION CIRCUIT
+VDC D10 SCD14 1 R43 10 DRVH C30 100pF/1KV R44 47K 24VSY NDRVL Q12 CMT08N50 HS2 HS 2 1 HS3 HS 2
1
2
1
Lp(2.5mH)
L4 C31 2 200uh/RM8 68nF/630V 13 Q13 T4 CMT60N06
2
R45 47K L5 +24V
DRVHGND
D11 SCD14 C32 47nF/630V R46 10 DRVL C37 100pF/1KV CMT60N06 ERL-35 16 9 Q15 Q14 CMT08N50 1 15 24VSY NDRVH C35 0.1uF/63V R47 47K + C33 14
0.8uH/10A + C34 1000uF/35V C36 C47
1000uF/35V
0.1uF/63V 0.1uF/63V
R49 47K
L6 Q16 10 11 C40 0.1uF/63V 12 D12 IPLIMIT T5 3 1 BAV99 C42 470nF/25V R50 330 1/4W 4 D13 CT-UU-9.8 2 SI4856ADY 24VSY NDRVH Q17 + C38 1000uF/16V + C39 1000uF/16V SI4856ADY 24VSY NDRVL 2uH/3A
+12V
C41 0.1uF/63V
BAV99
+24V CN2 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1
+24V CN3 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 +12V CN4 6 5 4 3 2 1 6 5 4 3 2 1 6 5 4 3 2 1 5VSB CN5 6 5 4 3 2 1 CN6 2 1 2 1 ENABLE
CN2.54-P10
CN2.54-P10
CN2.54-P6
CN2.54-P6
12VS
Q18 BC817 + C43 100uF/25V 2.2uF/63V Q20 BC807 3 6 DRVHGND C44 T6 5 DRVH
12VS +12V +24V +12V D14 R53 6.8K R54 15K SCD12 EE19 12VS Q24 BC817 2 7 DRVL
8
R55 390
R56 620 1 2 3 VREF 4 R64 6.8K SD 5 6 7 8
Q25 U6 Rset VFB FEAO D_IND_IN+ DEAO CSS Ilim VREF VCC PRIDRV PRIDRVB SRDRV SRDRVB GND RT/CT 16 15 14 13 12 11 10 9 39K C55 820pF/25VN C56 0.1uF/25V 12VS Q21 BC817 R73 12VS VREF VREF 12VS Q19 BC817 12VS BC807
C50 10nF/25V C49 470pF/25VN R63 150K
R51
4.7 1/4W 24VSY NDRVH
Q22 BC807
R57 910
C51 1uF/16V R65 4.7K R66 R67 33K NC R68 NC
R70 100K R69 240K R71 C52 104pF C53 0.1uF/25V IPLIMIT 13K R72 1K
CM6900
C54 0.1uF/25V
R52
4.7 1/4W 24VSY NDRVL
Q23 BC807
2007/11/22 Rev1.0
Champion Microelectronic Corporation
Page 2
CM6900G
Resonant Controller
PIN DESCRIPTION
Pin No.
1
Symbol
RSET
Description
External resistor which convert FEAO voltage signal into current signal for frequency modulation. Non-inverting input into resonant error amplifier and OVP input. Resonant error amplifier output and compensation node for frequency modulation control.
Operating Voltage Min. Typ. Max. Unit
0 5.5 V
2
VFB FEAO
0
2.5
3
V
3
0
5.5
V
4
D_IND_IN+
Inverting input into PWM error amplifier.
0
6
V
5
Non-inverting input into PWM error amplifier. PWM error amplifier output and compensation node for PWM control.
0
6
V
6
DEAO
0
4.5
V
7
CSS ILIM RTCT GND SDRVB SDRV PRIDRV PRIDRVB VCC VREF
Soft start for FM/PWM operation with 1V enable threshold. Also, use for auto-restart operation during current limit. Input to current comparator with 1V threshold. Oscillator timing components which set the minimum frequency. Ground Synchronous MOSFET driver output. Synchronous MOSFET driver output. Primary side MOSFET driver output. Primary side MOSFET driver output. Positive supply for the IC Buffered output for the 7.5V voltage reference
0
5.5
V
8 9 10 11 12 13 14 15 16
0 1.2
1
1.25 3
V V
-0.3 -0.3 -0.3 -0.3 10 15 7.5
VCC VCC VCC VCC 17.5
V V V V V V
2007/11/22 Rev1.0
Champion Microelectronic Corporation
Page 3
CM6900G
Resonant Controller
BLOCK DIAGRAM
FEAO VCC
UVLO/REF
VFB
VREF
+ V To I -
GND
2.5V
RSET
D_IN-
1.25V OVP
+
2.9V
D_IN+
+
DEAO
VCC
+ + Logic
PRIDRV PRIDRVB
CSS
SRDRV
+
SHDN 1V SRDRVB ILIM
+
ILim CLK 1V
RT CT
OSC
-
ABSOULTE MAXIMUM RATINGS (TA=25, unless otherwise specified.)
The following ratings designate persistent limits beyond which damage to the device may occur.
Symbol
VCC SRDRV SRDRVB PRIDRV PRIDRVB VREF RTCT VILIM CSS DEAO D_IN+ FEAO VFB RSET DC Supply Voltage SRDRV Voltage SRDRVB Voltage PRIDRV Voltage PRIDRVB Voltage VREF Voltage RTCT Voltage VILIM Voltage CSS Voltage
Parameter
Value
-0.3 to 20 -0.3 to VCC+0.3 -0.3 to VCC+0.3 -0.3 to VCC+0.3 -0.3 to VCC+0.3 -0.3 to 7.5 -0.3 to VREF+0.3 -0.3 to VREF+0.3 -0.3 to VREF+0.3 -0.3 to VREF+0.3 -0.3 to VREF+0.3 -0.3 to VREF+0.3 -0.3 to VREF+0.3 -0.3 to VREF+0.3
Unit
V V V V V V V V V V V V V V
PWM Error Amplifier Output Voltage Non-Inverting Input Into PWM Error Amplifier Voltage Resonant Error Amplifier Output Voltage Non-Inverting Input Into Resonant Error Amplifier Voltage V to I Voltage Champion Microelectronic Corporation
2007/11/22 Rev1.0
Page 4
CM6900G
Resonant Controller
ELECTRICAL CHARACTERISTICS
(VCC=12V, RTCT Freq. =100 KHz, Duty Cycle=50% , Temp=25 degree C, unless otherwise specified.)
Parameter Symbol Conditions Min. Typ. Max. Unit
VREF (pin 16) Reference Voltage Line Regulation Load Regulation VCC (pin 15) VCC Start up voltage UVLO Hysteresics Operating Current Vstart Hyst ICC 12.5 13 3 1 13.5 3.5 V V mA VREF TA=25'C; Iref=1mA 11V < Vcc < 16.5V 0mA < Iref < 7.5mA 7.4 7.5 10 10 7.6 25 25 V mV mV
PRIDRV,PRIDRVB,SRDRV,SRDRVB (pin 11,12,13 and 14) Output Low Voltage Output High Voltage Iout peak source current Iout peak sink current PMOS Rdson NMOS Rdson Dead Time between PRIDRV and PRIDRVB Rising Edge Delay Between PRIDRV and SRDRV Falling Edge Delay Between SRDRV and PRIDRV Duty Cycle Range ILIM (pin 8) Threshold Voltage
CSS (pin 7)
Vol Voh Iout Iout Rout Rout TDead
Isrdrv=-6mA Isrdrv=+6mA 9.6
0.6 10.8 0.12 0.12 200.0 100.0 400
1.2
V V A A
250.0 150.0
Ohm Ohm ns
Tdelay
500
ns
Tdelay 0
500 50
ns %
Vth
0.9
1
1.1
V
Soft Start Current Enable Voltage Enable Hysteresis Auto-restart Upper Threshold Auto-restart Lower Threshold
Iss Ven Vhyst Vup 4.85 0.9
7.5 1.0 75 5.0 5.15 1.1
uA V mV V
Vlw
1-Vhyst
V
2007/11/22 Rev1.0
Champion Microelectronic Corporation
Page 5
CM6900G
Resonant Controller
ELECTRICAL CHARACTERISTICS
(VCC=12V, RTCT Freq. =100 KHz, Duty Cycle=50% , Temp=25 degree C, unless otherwise specified.)
Parameter Symbol Conditions Min. Typ. Max. Unit
FEAO Resonant Error Amplifier (pin 3) Input Voltage Range Transconductance Feedback Reference Voltage Input Bias Current Output High Voltage Output Low Voltage Sink Current Source Current Open Loop Gain DEAO PWM Error Amplifier (pin 6) Input Voltage Range Transconductance Input Bias Current Output Voltage High Output Voltage Low Sink Current Source Current Open Loop Gain RTCT Oscillator;RT=61K;CT=470pF (pin 8) Initial Accuracy Volatge Stability Temperature Stability Ramp Valley to Peak Voltage CT Discharge Time Maxmum Duty cycle Minimum Duty Cycle
VFB OVP Comparator
6 Gm 2.45 -1 135 2.5 -0.5 5.5+VBE 0.1 -15 15 60 0.4 2.55
V umho V uA V V uA uA dB
6 Gm -1.0 135 -0.5 3+VBE 0.1 -15 15 60 0.4
V umho uA V V uA uA dB
TA=25'C 11V < Vcc < 16.5V
95
100 1 2 2 350
105
Khz % % V nS % %
DEAO > 3.0V DEAO < 1.2V
50 0
Threshold Voltage
VCC OVP Comparator
2.94
V
Input Voltage Range
17.5
V
2007/11/22 Rev1.0
Champion Microelectronic Corporation
Page 6
CM6900G
Resonant Controller
Timing Diagram
Dead Time PRIDRVB
PRIDRV Delay Time
Delay Time SRDRVB
SRDRV
Oscillator
The oscillator frequency is determined by the values of RT and CT. fosc = 1 / (tRAMP + t DEADTIME) tRAMP = RT * CT * ln((VREF + ICHG*RT -1.25)/(VREF + ICHG*RT -3)) where ICHG = 4*(FEAO-VBE)/RSET tDEADTIME = 2.125V/2.5mA * CT = 850 * CT
Resonant Section
FM Modulator Frequency modulation of the resonant controller section is accomplished by controlling the charging current of the oscillator through resonant error amplifier. The frequency of the resonant section is 1/2 of the oscillator frequency. Compensation is accomplished by connecting R and C in series to the FEAO pin. ICHG = 4*(FEAO-VBE)/RSET ICHG(max) = 20V/RSET
2007/11/22 Rev1.0
Champion Microelectronic Corporation
Page 7
CM6900G
Resonant Controller
Vref
RT VFB
+ V To I OSC
CT
2.5V
-
RSET
PWM Section
Pulse Width Modulator PWM control is used in voltage mode. In Applicaton1, when FEAO is equal to the external reference voltage at D_IN+ due to light load, the frequency of the oscillator is fixed at a value determined by the voltage at FEAO, and the controller enters into PWM mode. In this mode, both frequency modulator and pulse width modulator are active. In Application 2 ,the offset voltage Vos is externally generated between the VFB pin and D_IN- through a resistor network Rf1, Rf2 and Rf3 in order to separate the interaction between FM mode and PWM mode. Vos = 2.5VxRf2/Rf3 When the output load is reduced to a point where FEAO is railed to its maximum value of 5V+ VBE, the frequency is fixed at a value determined by 5V+VBE. Further reduction in load will cause the controller to go into PWM mode when the voltage at the VFB pin is 2.5V+Vos. During this light load operation, FM error amplifier is in open-loop mode while PWM is in closed-loop mode. Compensation is accomplished by connecting R and C in series to the DEAO pin. In Application 3 , low gain configuration accomplished by connecting Rf4 and Rf5 in the closed loop configuration . The gain for the PWM is determined by Rf4 and Rf5 where the gain is equal to -Rf5/Rf4. The voltage of VRset at which the controller goes into FM and PWM simultaneously is equal to : VRset = D_IN+ x (1+Rf4/Rf5) - (Rf4/Rf5) x 3 where 3 is the peak voltage of RTCT Varyin Rset from VRset to VRset + 1.75 x Rf4/Rf5 will cause the duty cycle to vary from 50% to 0% while the frequency will vary propotionally according to 1.75*Rf4/Rf5 where 1.75 is the peak-to-peak voltage of the RTCT ramp. For proper operation, select Rf5 value so that the current through Rf5 {((D_IN+) - 1.2)/Rf5} should be less than 5uA.
2007/11/22 Rev1.0
Champion Microelectronic Corporation
Page 8
CM6900G
Resonant Controller
Vout Application 1 Vref
Vout
Application 2
Vref
Rf1 VFB
RT
Rf1 VFB
RT
+
FEAO
+
V To I
OSC
CT
FEAO
V To I
OSC
CT
Rf3
2.5V
-
Rf2
2.5V
-
RSET
RSET
Vref
D_IN-
DEAO
D_IN+
+
D_IN+
DEAO
PWM
+ +
D_IN-
+
Rf3
RT CT
PWM
RT CT
Vout
Application 3
Vref
Rf1 VFB
RT
+
FEAO
V To I
OSC
CT
Rf3
2.5V
-
RSET Rf4
Vref Rf5 D_IN-
DEAO
D_IN+
+ +
PWM
RT CT
2007/11/22 Rev1.0
Champion Microelectronic Corporation
Page 9
CM6900G
Resonant Controller
Soft Start and Enable
Soft start of the FM and PWM is controlled by the selection of the external capacitor at CSS pin. A current source of 8uA supplies the charging current for the capacitor. Soft start of the FM and PWM begins at 1.25V. The soft start pin CSS also serves as an enable function. The output drivers are enabled when CSS pin reached 1V.
Auto-retry Mode
During normal operation, CSS pin will be charged to 5.5V + VBE. When VFB exceeds 2.93V due to OVP or ILIM exceeds 1V due to over current condition, output drivers are immediate set to low , and CSS begins to discharge with 3.3uA current source. When CSS pin is below 0.9V, 8uA current source start charging the CSS pin. When CSS pin reaches 1V, the output drivers are re-enable and the controller goes into soft start mode. If OVP or over current condition still exists then, the outputs are immediately disabled, but CSS continues to charge toward 5V. When CSS reaches 5V, 8uA charging current is disabled and 3.3uA current source begins to discharge the CSS, and the cycle repeat until OVP or over current condition is removed.
2007/11/22 Rev1.0
Champion Microelectronic Corporation
Page 10
CM6900G
Resonant Controller
PACKAGE DIMENSION
16-PIN PSOP (PS16)
2007/11/22 Rev1.0
Champion Microelectronic Corporation
Page 11
CM6900G
Resonant Controller
IMPORTANT NOTICE
Champion Microelectronic Corporation (CMC) reserves the right to make changes to its products or to discontinue any integrated circuit product or service without notice, and advises its customers to obtain the latest version of relevant information to verify, before placing orders, that the information being relied on is current. A few applications using integrated circuit products may involve potential risks of death, personal injury, or severe property or environmental damage. CMC integrated circuit products are not designed, intended, authorized, or warranted to be suitable for use in life-support applications, devices or systems or other critical applications. Use of CMC products in such applications is understood to be fully at the risk of the customer. In order to minimize risks associated with the customer's applications, the customer should provide adequate design and operating safeguards. CMC assumes to no liability to customer product design or application support. CMC warrants the performance of its products to the specifications applicable at the time of sale.
HsinChu Headquarter
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Sales & Marketing
7F-6, No.32, Sec. 1, Chenggong Rd., Nangang District, Taipei City 115, Taiwan, R.O.C. T E L : +886-2-2788 0558 F A X : +886-2-2788 2985
2007/11/22 Rev1.0
Champion Microelectronic Corporation
Page 12

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