CM6901G 데이터시트 PDF

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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

CM6901G

Resonant Controller

PIN DESCRIPTION

Pin No.

1

Symbol

RSET

Description

External resistor which convert FEAO voltage signal into current

signal for frequency modulation.

Operating Voltage

Min. Typ. Max. Unit

0 5.5 V

2

VFB

Non-inverting input into resonant error amplifier and OVP input.

0

2.5

3

V

3 FEAO Resonant error amplifier output and compensation node for

frequency modulation control.

4

D_IN-

Inverting input into PWM error amplifier.

0

0

5.5 V

6V

5 D_IN+ Non-inverting input into PWM error amplifier.

0 6V

6

DEAO

PWM error amplifier output and compensation node for PWM

0

control.

4.5 V

7

CSS

Soft start for FM/PWM operation with 1V enable threshold. Also, 0

use for auto-restart operation during current limit.

5.5 V

8

ILIM

Input to current comparator with 1V threshold.

0 1 1.25 V

9

RTCT

Oscillator timing components which set the minimum frequency.

1.2

3V

10

GND

Ground

11 SDRVB Synchronous MOSFET driver output.

12 SDRV Synchronous MOSFET driver output.

13 PRIDRV Primary side MOSFET driver output.

14 PRIDRVB Primary side MOSFET driver output.

15

VCC

Positive supply for the IC

16 VREF Buffered output for the 7.5V voltage reference

-0.3 VCC V

-0.3 VCC V

-0.3 VCC V

-0.3 VCC V

10 15 17.5 V

7.5 V

2008/05/23 Preliminary

Champion Microelectronic Corporation

Page 4

CM6901G

Resonant Controller

ELECTRICAL CHARACTERISTICS

(VCC=12V, RTCT Freq. =100 KHz, Duty Cycle=50% , Temp=25 degree C, unless otherwise specified.)

Parameter

Symbol

Conditions

FEAO Resonant Error Amplifier (pin 3)

Input Voltage Range

Transconductance

Gm

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

Gm

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

TA=25’C

Volatge Stability

11V < Vcc < 16.5V

Temperature Stability

Ramp Valley to Peak Voltage

CT Discharge Time

Maxmum Duty cycle

DEAO > 3.0V

Minimum Duty Cycle

DEAO < 1.2V

Min.

2.45

-1

-1.0

95

Typ.

135

2.5

-0.5

5.5+VBE

0.1

-15

15

60

135

-0.5

3+VBE

0.1

-15

15

60

100

1

2

2

350

50

0

Max.

6

2.55

0.4

6

0.4

105

VFB OVP Comparator

Threshold Voltage

2.94

VCC OVP Comparator

Input Voltage Range

17.5

Unit

V

umho

V

uA

V

V

uA

uA

dB

V

umho

uA

V

V

uA

uA

dB

Khz

%

%

V

nS

%

%

V

V

2008/05/23 Preliminary

Champion Microelectronic Corporation

Page 7

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