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RM6203
High Performance Current Mode PWM Switching Power Supply controller

DESCRIPTION

FEATURES

The RM6203 is a current mode PWM switching power
supply controller that specifically designed for AC/DC
converter with high performance versus cost ratio. It provides
continuous output power up to 12W in the broad voltage range
of 85V – 265V.Its optimized and highly reasonable circuit
design has made it possible to minimize the total cost of the
product. This power supply controller could be used in typical
flyback circuit topology to constitute simple AC/DC converter.
The internal initiating circuit of RM6203 has been designed
with a unique means of current sink to complete the startup
using the amplifying function of the power switching tube. This
will significantly reduce the power consumption of the start-up
resistor; and when the output power becomes smaller,
RM6203 will automatically lower its operating frequency to
enable very low standby power consumption.
When the power tube stops, the internal circuit will turn
the power tube reverse bias to greatly raise the voltage
resistant capacity of OC pin. This will ensure the safety of the
power tube. The internal design of the RM6203 is also
provided with over-load and saturation preventive function
capable of preventing disorders such as overload, transformer
saturation and output short-circuit, so as to increase the
reliability of the power supply. A voltage reference of 2.5V is
also integrated in the RM6203 to provide accurate power
supply to the clock circuit, and the clock frequency may be set
by external timing capacitance. Presently, standard DIP8
package and environmental friendly lead-free package in
compliance with European standard can be supplied.

■ Built-in 700V high voltage power switching tube with
minimal external parts count

■ Latched PWM and pulse-by-pulse current limiting
inspection

■ Reduced frequency at low output with standby power
consumption below 0.25W

■ Built-in slope and feedback compensation function
■ Separate upper limit current inspection controller to
handle timely the over-current and overload of the controller

■ Turn off periodic bias output of the emitter to improve the
voltage resistance of the power tube

■ Built-in thermal protective circuit
■ Complete start-up using amplification of the switching
power tube to reduce the power consumption of the start-up
resistor more than ten times

■ Automatic VCC over-voltage limit
■ Broad voltage output power up to 5W and narrow voltage
output power up to 8W

Applications
■ Power Adaptors(traveling chargers ,stand-alone power
set)

■ Internal power supply for Energy-Saving Appliances (such
as electromagnetic oven, microwave oven and etc.)

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1

RM6203

TYPICAL APPLICATION

PACKAGE INFORMATION
TOP VIEW

DIP-8

PIN FUNCTIONS

2

Pin
1

Symbol
OB

2
3
4
5
6
7、8

VCC
GND
CT
FB
IS
OC

Function Description
Base Pin of the Power Tube.(Enabling current input and connect to initiating
resistance)
Power Supply Pin
Ground Pin
Oscillation Capacitance Pin.(Connect to timing capacitance)
Feedback Pin
Current Inspection Pin
Output Pin( Connect to switching transformer)

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RM6203

ABSOLUTE MAXIMUM RATINGS(Note 1)
Supply Voltage VCC…………………………….… 18V
OC Voltage……………………………..…… -0.3-700V
Total Dissipation Power………………..…… 1000mW
Storage Temperature Range…………… -40 - 150℃

Pin Input Voltage………………………………… VCC+0.3V
Switching Current………………….………………… 800mA
Operating Temperature Range……..……………… 0-75℃
Welding Temperature……......……………… +260℃，10S

ELECTRICAL CHARACTERISTICS
The specifications are applied at T=25℃, VCC=5.5-7.5V, Ct=680PF, RS=1Ω, unless otherwise noted.(Note 2)
Parameter
Symbol
Conditions
Min
Typ
Max
Output Section
Max. Withstanding Voltage of
IOC=10mA
700
the Switching Tube
Saturation Voltage
VSAT
Ioc=250mA
1
Output Rise Time
TR
CL=1nF
75
Output Fall Time
TF
CL=1nF
75
Output Limiting Current
250
270
290
Tj=0-100℃
Reference Section
Reference Output Voltage
VREF
Io=1.0mA
2.4
2.5
2.6
Line Regulation
Vcc=5.5-9V
2
20
Load Regulation
Io=0.1-1.2mA
3
Temperature Stability
0.2
Output Noise Voltage
F=10Hz-10KHz
50
Long Term Stability
5
1000 hours@85℃
Oscillator Section
Oscillating Frequency
FOSC
Ct=680PF
59
66
73
Voltage Stability
Vcc=5.5-9V
1
Temperature Stability
1
Ta=0-85℃
Oscillator Amplitude (Vp - p)
2.2
Feedback Section
Input
Pull-up
FB=2.5V, IS=0V
0.55
0.6
0.65
Impedance Current
Pull-Down
30
Resistor
Power Supply Suppression
Vcc=5.5-9V
60
70
Ratio
Current Sampling Section
Current Sampling Threshold
VCS
0.55
0.60
0.65
Anti-Upper Limit Current
IL
0.25
0.27
0.29
Power Supply Suppression
60
70
Ratio
PWM Section
Maximum Duty Ratio
DMAX
53
57
61
Minimum Duty Ratio
DMIN
3.5
Power Supply Current Section
Initiating Reception Current
1.6
2.4
3.2
Initiating Static Current
55
80
Static Current
IQ
Vcc=8V
2.8
Start-up voltage
7.6
7.8
8.0
Oscillator Turn-off Voltage
4.2
4.4
4.6
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Units
V
V
ns
ns
mA
V
mV
%
mV/℃
uV
mV
KHz
%
%
V
mA
KΩ
dB

V
A
dB

%
%
mA
uA
mA
V
V

3

RM6203

ELECTRICAL CHARACTERISTICS
The specifications are applied at T=25℃, VCC=5.5-7.5V, Ct=680PF, RS=1Ω, unless otherwise noted.(Note 2)(continued)
Re-enabling voltage
3.8
V
Over-Voltage Limiting
9.5
10
10.5
V
Threshold
Note2: TheRM6203 is guaranteed to meet performance
Note1: Stresses beyond those listed under Absolute Maximum
specifications from 0℃ to 70℃. Specifications over the -40℃
Ratings may cause permanent damage to the device.
to 85℃ operating temperature range are assured by design,
Exposure to any Absolute Maximum Rating condition for
characterization and correlation with statistical process
extended periods may affect device reliability and lifetime.
controls.

BLOCK DIAGRAM

OPERATION

(Refer to Block Diagram)

In the enabling stage, when power is on, VR is closed; the
pull-up current source FB is closed; OE inputs enabling current
from power tube to VCC; OB controls the base current of the
power tube, limits the collector current of the power tube (i.e.
RM6203 initiates the reception current), so as to ensure the
safety of the power tube; when VCC voltage raises up to 7.8 V,
the enabling stage ends and it goes into the normal stage.
In the normal stage, VCC voltage should be maintained at
4.8V to 9.0V, VR outputs 2.5V reference; FB pull-up current
source is opened; the oscillator output OSC1 decides the
maximum duty ratio, output OSC2 tries to trigger the power
into open period, and the screened power tube turns on the
current peak; if FB is below 1.8V (approximately between 1.2V

4

and 1.8V), the oscillator period will then be increased, the
smaller the FB is, the wider the oscillator period will be, until
the stop of the oscillator (this feature will lower the stand-by
power consumption of the switch power source); if the external
feedback intends to make VCC higher than 10V, the internal
circuit feedback to FB will stabilize VCC at 9.8V (with this
feature, the internal circuit rather than the external feedback
circuit will be used to stabilize the output voltage, but the
stabilizing accuracy may be low); in the open period, OB
supplies base current to power tube, OE pulls down the emitter
of the power tube to IS, and the OB uses the slope current
driving (i.e. the OB open current is the function of IS, when IS
= 0V, OB open current is approximately 40mA, then the OB

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open current will increase along with IS linearly, when IS raises
to 0.6V, the OB open current is approximately 100mA, this
feature will effectively utilize the output current of OB and lower
the power consumption of RM6203), if IS detects the specified
current of FB, it goes into close period; in the close period, OB
pulls down, the power tube may not be turned off immediately,
but OE clamps on 2.0V (after the power tube turns off, the
base will be reverse bias and the voltage withstanding
capacity is increased); in the open or close period, if it detects
the current exceeding upper limit of the power tube, then the
upper limit flip-flop will be put at the preferential position,
forcing FB to decrease and the duty ratio will turn smaller, so
that the power tube and transformer will be protected; at the

RM6203
beginning of next close period edge or if FB is below 1.8V, the
upper limit flip-flop will reset. Besides, the built-in heat
protection of RM6203 will widen the oscillator period when the
internal temperature is above 125 ℃ to ensure the
temperature of RM6203 will not exceed 135℃; the built-in
slope compensation will stabilize the open/close period when
RM6203 is at high duty ratio or in continuous current mode.
When VCC lowers to about 4.4V, the oscillator will be
closed, OSC1 and OSC2 will be at low level, and the power
source will be maintained at close period; when VCC goes on
lowering to about 3.8V, RM6203 will enter the enabling stage
again.

Normal Stage Switching Cycle Oscillogram

Global Oscillogram

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5

RM6203

TEST DATA
VIN
(VAC)

90Vac

100Vac

240Vac

256Vac

6

RM6203(12V)
VOR
POUT
η
(mVp-p) (W)
(%)

PIN
(W)

VOUT
(V)

IOUT
(A)

VCC
(V)

0.1
3.2
7.6
12.0
15.1
0.1
3.1
7.5
11.9
14.9

12.1
12.1
12.1
12.1
12.1
12.1
12.1
12.1
12.1
12.1

0
0.2
0.5
0.8
1.0
0
0.2
0.5
0.8
1.0

5.36
6.64
6.64
6.64
6.64
5.28
6.70
6.70
6.70
6.70

0
2.4
6.1
9.7
12.1
0
2.4
6.1
9.7
12.1

0.1
3.0
7.3
11.5
14.4
0.1
3.0
7.4

12.1
12.1
12.1
12.1
12.1
12.1
12.1
12.1

0
0.2
0.5
0.8
1.0
0
0.2
0.5

4.96
6.96
6.96
6.96
6.96
4.88
7.04
7.04

0
2.4
6.1
9.7
12.1
0
2.4
6.1

11.6
14.5

12.1
12.1

0.8
1.0

7.04
7.04

9.7
12.1

75.0
80.3
80.8
80.1
77.4
81.3
81.5
81.2
80.0
83.5
84.3
84.0
80.0
82.4
83.6
83.4

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OCP
(A)

OPP
(A)

Average
η(%)

1.07

1.36

79.05

1.13

1.45

80.35

1.69

2.13

82.95

1.72

2.17

82.35

CEC
Standerd
η(%)

RM6203

PACKAGE INFORMATION
DIP-8

Dimensions
Symbol
Min.
A
A1
A2
b
b1
D
E
E1
E
L
eB
θ°

0.381
3.175
9.017
6.223
2.921
8.509
0°

Millimeter
Typ.
3.302
1.524
0.457
9.271
7.620
6.350
2.540
3.302
9.017
7°

Max.
5.334

Min.

3.429

0.015
0.125

10.160

0.355

6.477

0.245

3.810
9.525
15°

0.115
0.335
0°

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Inch
Typ.
0.130
0.060
0.018
0.365
0.300
0.250
0.100
0.130
0.355
7°

Max.
0.210
0.135
0.400
0.255
0.150
0.375
15°

7

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