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CM6901G Schematic ( PDF Datasheet ) - Champion Microelectronic

Teilenummer CM6901G
Beschreibung Resonant Controller
Hersteller Champion Microelectronic
Logo Champion Microelectronic Logo 




Gesamt 14 Seiten
CM6901G Datasheet, Funktion
CM6901G
Resonant Controller
GENERAL DESCRIPTION
FEATURES
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. The OVP protection can be ‹
latched when a standby converter is applied. Otherwise, ‹
the OVP protection is an auto-restart OVP.
‹
‹
‹
‹
90+ Controller
Smaller and Thinner Transformer
20mS with reasonable Bulk Cap
SLS, SRC/LLC + SR resonant controller
Supply Voltage Range : 10V to 15V.
Supply Voltage Range : 10V to 15V.
2 Gate Drivers: Typical Peak Drive from 12V
supply : (PMOS~200 ohm and NMOS~100 ohm).
UVLO=13V with 3V Hystetesis.
Reference OK Comparator.
FM + 2 PWMING Mode Operation
Light Load PWMING
SR Ideal Diode PWMING
GM feao, FM modulation Error Amplifier
GM deao, PWM Error Amplifier
Close Loop Soft start Capability with Shutdown
Function.
Latch or Auto-Restart during Current Limit or OVP.
Precision 2.5V Vfb threshold for constant voltage
feedback loop
Precision 1V I limit threshold
Precision 2.75V OVP threshold
2008/05/23 Preliminary
Champion Microelectronic Corporation
Page 1






CM6901G Datasheet, Funktion
CM6901G
Resonant Controller
ELECTRICAL CHARACTERISTICS
(VCC=12V, RTCT Freq. =100 KHz, Duty Cycle=50% , Temp=25 degree C, unless otherwise specified.)
Parameter
Symbol
Conditions
VREF (pin 16)
Reference Voltage
VREF TA=25’C; Iref=1mA
Line Regulation
11V < Vcc < 16.5V
Load Regulation
0mA < Iref < 7.5mA
VCC (pin 15)
VCC Start up voltage
Vstart
UVLO Hysteresics
Hyst
Operating Current
ICC
PRIDRV,PRIDRVB,SRDRV,SRDRVB (pin 11,12,13 and 14)
Output Low Voltage
Vol Isrdrv=-6mA
Output High Voltage
Voh Isrdrv=+6mA
Iout peak source current
Iout
Iout peak sink current
Iout
PMOS Rdson
Rout
NMOS Rdson
Rout
Dead Time between
PRIDRV and PRIDRVB
TDead
Rising Edge Delay Between
PRIDRV and SRDRV
Tdelay
Falling Edge Delay Between
SRDRV and PRIDRV
Tdelay
Min.
7.4
12.5
9.6
Typ.
7.5
10
10
13
3
1
0.6
10.8
0.12
0.12
200.0
100.0
400
500
500
Max.
7.6
25
25
13.5
3.5
1.2
250.0
150.0
Duty Cycle Range
0 50
ILIM (pin 8)
Threshold Voltage
CSS (pin 7)
Soft Start Current
Enable Voltage
Enable Hysteresis
Auto-restart Upper
Threshold
Auto-restart Lower
Threshold
Vth
Iss
Ven
Vhyst
Vup
Vlw
0.9
0.9
4.85
1
7.5
1.0
75
5.0
1-Vhyst
1.1
1.1
5.15
Unit
V
mV
mV
V
V
mA
V
V
A
A
Ohm
Ohm
ns
ns
ns
%
V
uA
V
mV
V
V
2008/05/23 Preliminary
Champion Microelectronic Corporation
Page 6

6 Page









CM6901G pdf, datenblatt
Vout
Rf1
VFB
+
Rf3
2.5V
-
Application 3
FEAO
V To I
CM6901G
Resonant Controller
Vref
OSC
RT
CT
RSET
Rf4
Vref
D_IN+
D_IN- -
Rf5
DEAO
+
-
+
PWM
RT CT
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.
2008/05/23 Preliminary
Champion Microelectronic Corporation
Page 12

12 Page





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