Contents of this article
- How to enter to service mode
- Power supply schematics
- IC description
ROLSEN 42D60
SERVICE MODE
How to enter to service mode
To enter to factory mode Press the remote
keys in the following sequences
Display > 1 > 1 > Line
L6598 High voltage resonant
controller
Sense op amp for closed loop control or protection
features
High accuracy current controlled oscillator
Integrated bootstrap diode Clamping on Vs
Description
The L6598 device is manufactured with the BCD offline technology, able to ensure voltage ratings up to 600 V, making it perfectly suited for AC/DC adapters and wherever a resonant topology can be beneficial. The device is intended to drive two power MOSFETs, in the classical half bridge topology. A dedicated timing section allows the designer to set soft-start time, soft-start and minimum frequency. An error amplifier, together with the two enable inputs, are made available. In addition, the integrated bootstrap diode and the Zener clamping on low voltage supply, reduces to a minimum the external parts needed in the applications.
High accuracy current controlled oscillator
Integrated bootstrap diode Clamping on Vs
Description
The L6598 device is manufactured with the BCD offline technology, able to ensure voltage ratings up to 600 V, making it perfectly suited for AC/DC adapters and wherever a resonant topology can be beneficial. The device is intended to drive two power MOSFETs, in the classical half bridge topology. A dedicated timing section allows the designer to set soft-start time, soft-start and minimum frequency. An error amplifier, together with the two enable inputs, are made available. In addition, the integrated bootstrap diode and the Zener clamping on low voltage supply, reduces to a minimum the external parts needed in the applications.
PIN
|
Pin
no.
|
Name
|
Function
|
|
1
|
CSS
|
Soft-start
timing capacitor
|
|
2
|
Rfstart
|
Soft-start
frequency setting - low impedance voltage source -see also Cf
|
|
3
|
Cf
|
Oscillator
frequency setting - see also Rfmin, Rfstart
|
|
4
|
Rfmin
|
Minimum
oscillation frequency setting - low impedance voltage source - see also Cf
|
|
5
|
OPout
|
Sense
op amp output - low impedance
|
|
6
|
OPon-
|
Sense
op amp inverting input -high impedance
|
|
7
|
OPon+
|
Sense
op amp non inverting input - high impedance
|
|
8
|
EN1
|
Half
bridge latched enable
|
|
9
|
EN2
|
Half
bridge unlatched enable
|
|
10
|
GND
|
Ground
|
|
11
|
LVG
|
Low
side driver output
|
|
12
|
Vs
|
Supply
voltage with internal Zener clamp
|
|
13
|
N.C.
|
Not
connected
|
|
14
|
OUT
|
High
side driver reference
|
|
15
|
HVG
|
High
side driver output
|
|
16
|
Vboot
|
Bootstrapped
supply voltage
|
L6562 TRANSITION-MODE PFC
CONTROLLER
Description
The L6562 is a current-mode PFC controller operating in Transition Mode (TM). Pin-to-pin compatible with the predecessor L6561, it offers improved performance. The highly linear multiplier includes a special circuit, able to reduce AC input current distortion, that allows wide-range-mains operation with an extremely low THD, even over a large load range. The output voltage is controlled by means of a voltage-mode error amplifier and a precise (1% @Tj = 25°C) internal voltage reference. The device features extremely low consumption (≤70 µA before start-up and <4 mA running) and includes a disable function suitable for IC remote ON/OFF, which makes it easier to comply with energy saving norms (Blue Angel, EnergyStar, Energy2000, etc.). An effective two-step OVP enables to safely handle overvoltages either occurring at start-up or resulting from load disconnection. The totem-pole output stage, capable of 600 mA source and 800 mA sink current, is suitable for big MOSFET or IGBT drive which, combined with the other features, makes the device an excellent low-cost solution for EN61000-3-2 compliant SMPS's up to 300W.
The L6562 is a current-mode PFC controller operating in Transition Mode (TM). Pin-to-pin compatible with the predecessor L6561, it offers improved performance. The highly linear multiplier includes a special circuit, able to reduce AC input current distortion, that allows wide-range-mains operation with an extremely low THD, even over a large load range. The output voltage is controlled by means of a voltage-mode error amplifier and a precise (1% @Tj = 25°C) internal voltage reference. The device features extremely low consumption (≤70 µA before start-up and <4 mA running) and includes a disable function suitable for IC remote ON/OFF, which makes it easier to comply with energy saving norms (Blue Angel, EnergyStar, Energy2000, etc.). An effective two-step OVP enables to safely handle overvoltages either occurring at start-up or resulting from load disconnection. The totem-pole output stage, capable of 600 mA source and 800 mA sink current, is suitable for big MOSFET or IGBT drive which, combined with the other features, makes the device an excellent low-cost solution for EN61000-3-2 compliant SMPS's up to 300W.
PIN
|
No
|
Pin
|
Function
|
|
1
|
INV
|
Inverting
input of the error amplifier. The information on the output voltage of the
PFC pre
regulator is fed into the pin through a resistor divider. |
|
2
|
COMP
|
Output
of the error amplifier. A compensation network is placed between this pin and
INV (pin
#1) to achieve stability of the voltage control loop and ensure high power factor and low THD. |
|
3
|
MULT
|
Main
input to the multiplier. This pin is connected to the rectified mains voltage
via a resistor
divider and provides the sinusoidal reference to the current loop. |
|
4
|
CS
|
Input
to the PWM comparator. The current flowing in the MOSFET is sensed through a
resistor,
the resulting voltage is applied to this pin and compared with an internal sinusoidal-shaped reference, generated by the multiplier, to determine MOSFET’s turn-off. |
|
5
|
ZCD
|
Boost
inductor’s demagnetization sensing input for transition-mode operation. A
negative-going
edge triggers MOSFET’s turn-on. |
|
6
|
GND
|
Ground.
Current return for both the signal part of the IC and the gate driver.
|
|
7
|
GD
|
Gate
driver output. The totem pole output stage is able to drive power MOSFET’s
and IGBT’s
with a peak current of 600 mA source and 800 mA sink. The high-level voltage of this pin is clamped at about 12V to avoid excessive gate voltages in case the pin is supplied with a high Vcc. |
|
8
|
Vcc
|
Supply
Voltage of both the signal part of the IC and the gate driver. The supply
voltage upper
limit is extended to 22V min. to provide more headroom for supply voltage changes. |
POWER SUPPLY SCHEMATICS
PFC
MAIN POWER
CLICK ON THE IMAGES TO ZOOM IN
