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CM6901
SLS (SRC/LLC+SR) Controller with 1 FM+2 PWMs
GENERAL DESCRIPTION
CM6901 is a SLS, SRC/LLC + SR resonant controller and it can operate at both SRC and LLC region with synchronous rectification to achieve high efficiency. Its unique features: FM + 2 PWMING modes. It is used for DC-DC conversion in offline application. Light load regulation is accomplished by transitioning the controller from frequency modulation mode into PWM mode. To have the optimal balance performance between hold-up time and efficiency, its frequency range crosses fr1(resonant frequency). CM6901 system has a constant voltage feedback loop with precision 2.5V VFB reference. The 1V ILIMIT can be latched when a standby converter is applied; otherwise, it is an auto-restart I limit.
FEATURES
90+ Controller Smaller and Thinner Transformer 20ms with reasonable Bulk Cap(hold up time) SLS, SRC/LLC + SR resonant controller Supply Voltage Range : 10V to 20V. 2 Gate Drivers: Typical Peak Drive from 12V supply : (PMOS~200 ohm and NMOS~100 ohm). UVLO =11V with 1V Hystetesis. Reference OK Comparator. FM + 2 PWMING Mode Operation Light Load PWMING (light load regulation) SR Ideal Diode PWMING(cross resonant frequency application ) GM FEAO, FM modulation Error Amplifier GM DEAO, PWM Error Amplifier Close Loop Soft start Capability with Shutdown Function. Auto-Restart during Current Limit . Precision 2.5V VFB threshold for constant voltage feedback loop. Precision 1V I limit threshold.
APPLICATIONS
DC-DC power supply. Operates in FM/PWM mode.
CM6901 Pin Configuration
2010/03/26 Rev1.6
Champion Microelectronic Corporation
Page 1
CM6901
SLS (SRC/LLC+SR) Controller with 1 FM+2 PWMs
ORDERING INFORMATION
Part Number
CM6901GIS* CM6901GISTR* CM6901GIP* CM6901XIS* CM6901XISTR* CM6901XIP*
Temperature Range
-40 to 125 -40 to 125 -40 to 125 -40 to 125 -40 to 125 -40 to 125
Package
16-Pin SOP (S16) 16-Pin SOP (S16) 16-Pin PDIP (P16) 16-Pin SOP (S16) 16-Pin SOP (S16) 16-Pin PDIP (P16)
*Note : G : Suffix for Pb Free Product X : Suffix for Halogen Free and PB Free Product TR : Package is Typing Reel
BLOCK DIAGRAM
3 FEAO
CM6901
VCC 15 UVLO/REF
. -
2
VFB
+
V Tol
2.5V RSET
VREF 16
-
1
+
1.5V
-
GND 10
.
4 5
D IN. +
D IN+
1.25V
6
DEAO
-
PRIDRV 14 VCC 10uA
+ .
PRIDRVB 13
Logic
+
SRDRV 12 SRDRVB 11
7
CSS
SHDN 1V RTCT
-
.
ILIM
+
8
9
CLK OSC
.
ILim
-
1V
2010/03/26 Rev1.6
Champion Microelectronic Corporation
Page 2
CM6901
SLS (SRC/LLC+SR) Controller with 1 FM+2 PWMs
PIN DESCRIPTION
Operating Voltage Min.
External resistor which convert FEAO voltage signal into current 1 0
Pin No.
Symbol
Description
Typ.
Max.
5.5
Unit
V
RSET
signal for frequency modulation. SR is PWMing Control , when RSET lower than 1.5V.
2
VFB FEAO
Non-inverting input into resonant error amplifier . Resonant error amplifier output and compensation node for frequency modulation control.
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 PRIDRVB PRIDRV 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 20
V V V V V V
2010/03/26 Rev1.6
Champion Microelectronic Corporation
Page 3
CM6901
SLS (SRC/LLC+SR) Controller with 1 FM+2 PWMs
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
Unit V V V V V V V V V V V V V V
-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
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
2010/03/26 Rev1.6
Champion Microelectronic Corporation
Page 4
CM6901
SLS (SRC/LLC+SR) Controller with 1 FM+2 PWMs
ELECTRICAL CHARACTERISTICS
(VCC=12V, RT=40.2K1%, CT=1470PF1%, Freq. = 50 KHz, Duty Cycle=48% , Temp= -40 ~ 125 , unless otherwise specified.) Parameter VREF (pin 16) VREF Reference Voltage ( note1) VREF VREF Line Regulation Load Regulation VCC (pin 15) VCC Start up voltage VCC Turn off voltage VCC Start up current UVLO Hysteresics Operating Current Hys ICC Vstart 10.5 9.5 63.5 0.95 10.8 10 78.25 1 1 11.1 10.5 93 1.05 V V uA V mA TA=25; Iref=1mA TA=-40; Iref=0mA TA=125; Iref=0mA 11.5V < Vcc < 16.5V 0mA < Iref < 5mA 0 7.41 7.44 7.53 7.5 7.53 7.67 10 10 7.59 7.62 7.7 25 25 V V V mV mV Symbol Conditions Min. Typ. Max. Unit
SRDRVB , SRDRV , PRIDRVB , PRIDRV (pin 11,12,13,14) 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 SS Voltage Hi SS Voltage Low Vth TA=25 TA=25 TA=25 1.45 0.95 1.31 1.65 1 1.64 1.75 1.05 1.97 V V V Vol Voh Iout Iout Rout Rout TDead TDelay TDelay TA=25 TA=25 TA=25 TA=25 TA=25 164 168 0 Isrdrv=-6mA Isrdrv=+6mA 9.6 0.6 10.8 0.12 0.12 200 100 1 205 210 246 252 50 250 150 1.2 V V A A Ohm Ohm us ns ns %
2010/03/26 Rev1.6
Champion Microelectronic Corporation
Page 5
CM6901
SLS (SRC/LLC+SR) Controller with 1 FM+2 PWMs
ELECTRICAL CHARACTERISTICS
(VCC=12V, RT=40.2K1%, CT=1470PF1%, Freq. = 50 KHz, Duty Cycle=48% , Temp=-40 ~ 125, unless otherwise specified.) Parameter CSS (pin 7) Soft Start Current Enable Voltage Enable Hysteresis Auto-restart Upper Threshold Auto-restart Lower Threshold FEAO Resonant Error Amplifier (pin 3) Input Voltage Range Transconductance VFB (Pin2) TA=25 Feedback Reference Voltage (note 2) TA=125 TA=-40 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 Reference Voltage Transconductance Input Bias Current Output Voltage High Output Voltage Low Sink Current Source Current Open Loop Gain Gm TA=25 0.96 95 -1.0 1.01 125 -0.5 3+VBE 0.1 -5 7 60 0.4 6 1.06 155 V V umho uA V V uA uA dB VFB =250mV , TA=25 VFB = -250mV , TA=25 -21.5 12.4 2.475 2.485 2.465 -1 2.5 2.51 2.49 -0.5 5.5+VBE 0.1 -17.55 16.7 60 0.4 -13.6 21 2.525 2.535 2.515 V V V uA V V uA uA dB Gm VFB50mV, TA=25 37 49.5 6 62 V umho Iss Ven Vhys Vup Vlw TA=25 TA=25 TA=25 4.85 -8.8 0.9 -7.5 1.0 100 5.0 1-Vhyst 5.15 -6.3 1.1 uA V mV V V Symbol Conditions Min. Typ. Max. Unit
2010/03/26 Rev1.6
Champion Microelectronic Corporation
Page 6
CM6901
SLS (SRC/LLC+SR) Controller with 1 FM+2 PWMs
ELECTRICAL CHARACTERISTICS
(VCC=12V, RT=40.2K1%, CT=1470PF1%, Freq. = 50 KHz, Duty Cycle=48% , Temp=-40 ~ 125 , unless otherwise specified.)
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
RTCT Oscillator ; RT=40.2K1%;CT=1470pF1%, (pin 9) Initial Accuracy Voltage Stability Temperature Stability Ramp Valley to Peak Voltage CT Discharge Time Maximum Duty cycle Minimum Duty Cycle DEAO > 3.0V DEAO < 1.2V TA=25 11.5V < Vcc < 16.5V 45 50 1 2 2 350 48 0 55 Khz % % V nS % %
SR Ideal Diode ; Rset1=30.1K1% ; Rset2=215K1% (pin12) Maximum Duty cycle Middle Duty cycle Minimum Duty cycle Frequency at Minimum Duty cycle TA=25 , FEAO=2.2V TA=25 , FEAO=1.57V TA=25 , FEAO=0V 37.4 28.4 26.37 44 30.2 29.3 50.6 32 32.23 % % %
TA=25
22.14
24.6
27.06
KHz
2010/03/26 Rev1.6
Champion Microelectronic Corporation
Page 7
CM6901
SLS (SRC/LLC+SR) Controller with 1 FM+2 PWMs
Note1
Temperature V.S. Vref for CM6901
7.68 7.67 7.66 7.65 7.64 7.63 7.62 7.61 7.6 7.59 Vref 7.58 7.57 7.56 7.55 7.54 7.53 7.52 7.51 7.5 7.49 7.48 7.47 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 125
Vref
Temp
Note2
Temperature V.S. VFB for CM6901
2.555 2.55 2.545 Vfb 2.54 2.535 2.53 2.525 2.52 -40
2010/03/26 Rev1.6
Vfb
-30
-20
-10
0
Champion Microelectronic Corporation
10
20
30
Temp
40
50
60
70
80
90
100
110
125
Page 8
CM6901
SLS (SRC/LLC+SR) Controller with 1 FM+2 PWMs
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
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
2010/03/26 Rev1.6
Champion Microelectronic Corporation
Page 9
CM6901
SLS (SRC/LLC+SR) Controller with 1 FM+2 PWMs
V re f
RT VFB
+ V To I OSC
CT
2 .5 V
-
RSET
2 PWMings: SR Ideal Diode PWMing (Synchronous Outputs)
SR Ideal Diode PWMing for synchronous drivers is accomplished by comparing the voltage signal at the RSET pin to RTCT ramp. The pulse-width reduction happens when the voltage at the RSET is lower than 1.5V. This allows safe operation of the power converter with synchronous rectification when the switching frequency is below the highest resonant point frequency fr1.
V out V ref
R f1 V FB
3V RT
+
1.25V FEA O
V To I
O SC
+
To Logic
R f3
2.5V
1.5V RSET R f4 CT
D ecreasing Pulsew idth w ith V (R S E T)<1.5V
SRDRV
P R ID R V
2010/03/26 Rev1.6
Champion Microelectronic Corporation
Page 10
CM6901
SLS (SRC/LLC+SR) Controller with 1 FM+2 PWMs
Light Load PWMING
In Application , 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.
Vout
V re f
R f1 VFB
RT
+
FEAO
V To I
OSC
CT
R f3
2 .5 V
-
RSET R f4
V re f R f5 D _ IN -
DEAO
D _ IN +
+ +
PW M
RT CT
2010/03/26 Rev1.6
Champion Microelectronic Corporation
Page 11
CM6901
SLS (SRC/LLC+SR) Controller with 1 FM+2 PWMs
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 7.5uA 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 ILIM exceeds 1V due to over current condition, output drivers are immediate set to low , and CSS begins to discharge with 0.75uA current source. When CSS pin is below 0.9V, 7.5uA 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 over current condition still exists then, the outputs are immediately disabled, but CSS continues to charge toward 5V. cycle repeat until over current condition is removed. When CSS reaches 5V, 7.5uA charging current is disabled and 0.75uA current source begins to discharge the CSS, and the
OCP Setting
5.5 V+VBE 5V
Css 0.9V 1V
ILimit
2010/03/26 Rev1.6
Champion Microelectronic Corporation
Page 12
CM6901
SLS (SRC/LLC+SR) Controller with 1 FM+2 PWMs
TYPICAL APPLICATION CIRCUIT
DC-DC
D16 1N4148 C42 NC 380VDC
DRVH
R60 10 R61 47K
Q12 FCP11N60
12VSYNDRVL Lp(1.7mH)
PQ3230
2
R62 47K Q13 IR F2804PBF
8
DRVHGND
D17 1N4148 Q14 FCP11N60 C52 NC
9 5
L2 160uh/PQ512 C43 6
10
T4
+12VIS
82nF/800V 27TS
L3 130nH/20A
+12V
2TS
9
1 10
DRVL
R63 10 R65 47K
Q15 2TS IR F2804PBF
11 7
C49 R64 47K 0.1uF
+
+
C46
+
2200uF/16V
470uF/16V
C47
3300uF/16V
12VSYNDRVH
C45
C48
+
2200uF/25V
C50 0.1uF JP11 NC
C51 0.1uF
2TS
12
D18 EFM204
C54 R98 + C53 0.1uF 10K 680uF/25V
-12V H40
R91 0
OUT IPLIMIT
(2A/200V)
-12V
D19 BAV99
R66 5.6 C56 1uF/50V C55 105pF R67 470
IPLIMIT
D20 BAV99
1
12VS
SLS Controller
12VS
R68 47K Q16 2N2222 C57 47uF/25V
+
R69 47K
C58 1uF/50V
T5 EE-19
5
SD
Q18 2N7002 R97 47K
D21 SCS140P
+12V
Q19 BC817 R70 100K
12VS
Q17 2N2907
6 3
DRVH DRVHGND
+12V
PGI
D22 SCS140P
12VS
2 7
C59 0.22uF
R71 220K
R72 12K
Q20 2N2222 R73 316K 1% Q21 2N2907
8
DRVL
R74 750
1 2 3
U3 CM6901
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
12VS VREF
Q22 2N2222
12VS
R76 22
VREF
C60 102pF R78 3.3K C62 NC R84 220K R75 36.5K R77 220K
4 5 6
12VSYNDRVH
R79 56K
SD
C64 47pF
7
12VS VREF
Q23 2N2907 C67 0.1uF/25V Q24 2N2222
C63 1uF/16V
C61 333pF/25V R86 0
8
D26 SCS140P
R81 R82 R83 R85 R80 NC 47K 43K 150K 3M
R88 1K
IPLIMIT
R87 27K
C65 1uF/25V
C66 1000pF
12VS
R89 22
12VSYNDRVL
Q25 2N2907 D27 SCS140P
2010/03/26 Rev1.6
Champion Microelectronic Corporation
Page 13
CM6901
SLS (SRC/LLC+SR) Controller with 1 FM+2 PWMs
PACKAGE DIMENSION
16-PIN PDIP (P16)
PIN 1 ID
16-PIN SOP (S16)
2010/03/26 Rev1.6
Champion Microelectronic Corporation
Page 14
CM6901
SLS (SRC/LLC+SR) Controller with 1 FM+2 PWMs
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
5F, No. 11, Park Avenue II, Science-Based Industrial Park, HsinChu City, Taiwan T E L : +886-3-5679979 F A X : +886-3-5679909
Sales & Marketing
21F., No. 96, Sec. 1, Sintai 5th Rd., Sijhih City, Taipei County 22102, Taiwan, R.O.C. T E L : +886-2-2696 3558 F A X : +886-2-2696 3559
2010/03/26 Rev1.6
Champion Microelectronic Corporation
Page 15

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