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PDF CM6901G Data sheet ( Hoja de datos )
| Número de pieza | CM6901G | |
| Descripción | Resonant Controller | |
| Fabricantes | Champion Microelectronic | |
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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
1 page  
BLOCK DIAGRAM
CM6901G
Resonant Controller
3 FEAO
2 VFB
2.5V
+
-
-
V To I
UVLO /REF
VCC
VREF
15
16
GND 10
1 RSET
4 D_IN -
-
5 D_IN +
+
6 DEAO
VCC
CSS
7
9 RT CT
1.25V
+
+
-
+
SHDN
1V -
O SC
Logic
CLK
+
OVP
-
2 . 9V
+
IL i m
-
PRIDR V 14
P R ID R V B
13
SRDRV 12
SRDRVB 11
ILIM 8
1V
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
Parameter
DC Supply Voltage
SRDRV Voltage
SRDRVB Voltage
PRIDRV Voltage
PRIDRVB Voltage
VREF Voltage
RTCT Voltage
VILIM Voltage
CSS Voltage
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
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
2008/05/23 Preliminary
Champion Microelectronic Corporation
Page 5
5 Page 
CM6901G
Resonant Controller
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+ × (1+Rf4/Rf5) - (Rf4/Rf5) × 3 where 3 is the peak voltage of RTCT
Varyin Rset from VRset to VRset + 1.75 × 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
Rf1
VFB
+
Rf3
2.5V
-
Application 1
FEAO
V To I
Vout
Vref
OSC
Rf1
RT
VFB
+
CT Rf2
2.5V
-
Application 2
FEAO
V To I
Vref
OSC
RT
CT
Vref
D_IN+
D_IN- -
+
RSET
DEAO
-
+
RT CT
PWM
Rf3
RSET
D_IN+ +
D_IN-
-
DEAO
-
+
PWM
RT CT
2008/05/23 Preliminary
Champion Microelectronic Corporation
Page 11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet CM6901G.PDF ] | |
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