AN8022SB Panasonic Semiconductor, AN8022SB Datasheet

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AN8022SB

Manufacturer Part Number
AN8022SB
Description
AC-DC switching power supply control IC
Manufacturer
Panasonic Semiconductor
Datasheet
Voltage Regulators
AN8022L, AN8022SB
AC-DC switching power supply control IC
suitable for controlling a switching power supply using
primary side control method.
of relatively small capacity. Less frequently used func-
tions are removed, and only the necessary minimum func-
tions are incorporated, so that they are compact and very
easy to use.
much as possible, thus cost down can be realized by de-
creasing the peripheral parts.
ing the output rise time of 35 ns and the output fall time
of 25 ns.
so that it is possible to miniaturize the start resistor.
the direct drive of power MOSFET.
voltage (on/off: 14.2 V/9.2 V)
tection circuit.
It operates at a control frequency up to 700 kHz, realiz-
Pre-start operating current is as small as 70 A (typical)
Output block employs totem pole method.
The absolute maximum rating of 1.0 A (peak) allows
Built-in pulse-by-pulse overcurrent protection circuit
Built-in protection circuit against malfunction at low
Maximum Duty is 44% (typical)
Equipped with timer latch function and overvoltage pro-
Two kinds of packages: 9-pin SIP, 16-pin SOP
Various power supply equipment
Overview
Features
Applications
The AN8022L and AN8022SB are ICs which are
Those are most suited for a switching power supply
Moreover, the internal settings are incorporated as
AN8022L
AN8022SB
16
1
(0.45) 0.80
6.50
±0.30
0.35
Seating plane
4.3±0.3
SSOP016-P-0225B
±0.10
SIP009-P-0000D
9
8
0.3
1.0±0.25
+0.1
–0.05
9
8
7
6
5
4
3
2
1
2.7±0.25
1.4±0.25
1.35±0.25
1.00
±0.20
0.50
Unit: mm
Unit: mm
Seatng plane
±0.05
1

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AN8022SB Summary of contents

Page 1

... Voltage Regulators AN8022L, AN8022SB AC-DC switching power supply control IC Overview The AN8022L and AN8022SB are ICs which are suitable for controlling a switching power supply using primary side control method. Those are most suited for a switching power supply of relatively small capacity. Less frequently used func- ...

Page 2

... AN8022L, AN8022SB Block Diagram 8 TIM/OVP OVP ( (13) OSC 2 RT (12) Note) The number shows the pin number for the AN8022SB. Pin Descriptions AN8022L Pin No. Symbol 1 SS Soft start pin 2 RT Resistor connection pin that determines charge and discharge current of triangular wave 3 CT ...

Page 3

... 100 OSC1 max1 FB-Du min FB-Du max CC AN8022L, AN8022SB Rating Unit 0.3 to 7.0 V 0.3 to 7.0 V 150 mA 1 000 658 mW 340 150 Unit k Min ...

Page 4

... V REF (12) 500 (12 REF (13) I (13 REF (15) Reset 5 (1)(16) Note) The number the pin number for the AN8022SB (continued) a Symbol Conditions OSC2 under no load Dry-CLM under no load under no load ...

Page 5

... Comp (6) REF PWM comp. I/V conversion Note) The number shows the pin number for the AN8022SB OUT The terminal for directly driving a power MOSFET ( Supply voltage terminal. It monitors the supply voltage and has operating threshold value for start/stop/OVP reset ...

Page 6

... AN8022L, AN8022SB Application Notes [1] Main characteristics [Load: C Start/stop voltage characteristics Ambient temperature Standby bias current characteristics Ambient temperature Overcurrent protection threshold voltage characteristics 220 210 200 190 180 Ambient temperature ...

Page 7

... (continued OVP operating bias current characteristics 2.5 2.0 1.5 1.0 0.5 75 100 -50 After AC rectification Start voltage . CC Stop voltage AN8022L, AN8022SB - Ambient temperature ( C) Start resistance OUT GND Before start Start Voltage supplied a from bias coil ...

Page 8

... AN8022L, AN8022SB Application Notes (continued) [2] Operation descriptions (continued) 2. Oscillation circuit The PWM is an abbreviation of Pulse Width Modulation. In this IC, a smaller voltage between the voltage level which is converted from the current input to IFB terminal and dead-time control level which is fixed internally is compared with the internal triangular oscillation level through PWM comparator, and optimal duty is determined, and then it is output via output driving stage ...

Page 9

... It detects abnormal voltage applied from the outside to the power supply output (the voltage which is higher than voltage of the power supply output and may damage the load) by the primary side of the bias coil and operates the OVP. Figure 3 AN8022L, AN8022SB (IC stop state) (IC stop state) ...

Page 10

... Since such level fluctuation increases the necessity of withstand capability for the parts to be used and in the worst case it means the cause of destruction, the accuracy of detection level is raised as much as possible for these ICs, the AN8022L and AN8022SB. 10 ...

Page 11

... The external capacitor (hereinafter referred this capacitor is set to be sufficiently discharged by the transistor inside the IC. When the supply voltage exceeds the start voltage to start the IC operation, charging is started in the C the constant current source inside the IC. Therefore V AN8022L, AN8022SB Overshoot Pulse width can not be made due to ...

Page 12

... AN8022L, AN8022SB Application Notes (continued) [2] Operation descriptions (continued) 5. Soft start (continued) On the other hand, the the medium voltage of the triangular wave oscillation waveform as constant voltage. Therefore, at operation starting, the V is input to the PWM comparator as the lowest voltage and is compared with the triangular wave SS oscillation waveform ...

Page 13

... However, after charge/discharge particularly large current is not required to keep that condition. For the AN8022L or AN8022SB, capacitance value of the power MOSFET used is taking into account, and the capability of peak value ensured. The parasitic LC of the power MOSFET may produce ringing which makes the output pin go under the GND potential ...

Page 14

... For this reason, the AN8022L and AN8022SB use the following method: The soft start charge current is given from the constant current source used in the internal triangular wave oscillation circuit. In addition, the above constant ...

Page 15

... A [Setting the C1] When the AN8022L or AN8022SB is started, the operating supply current of 7 required at V The current should be supplied with the discharge current of the C1 during the period from the soft start time up to the time when the supply current is supplied from the auxiliary bias coil. Therefore, set the C1 as shown in ...

Page 16

... AN8022L, AN8022SB Application Circuit Example Filter 16 5 GND 4 CLM IFB Voltage Regulators ...

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