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2AS01 Schematic ( PDF Datasheet ) - Infineon Technologies Corporation

Teilenummer 2AS01
Beschreibung ICE2AS01
Hersteller Infineon Technologies Corporation
Logo Infineon Technologies Corporation Logo 




Gesamt 24 Seiten
2AS01 Datasheet, Funktion
D a t a s h e e t , V e r s i o n 3 . 0 , F e b r u a r y 2 0 0 2www.DataSheet4U.com
ICE2AS01
ICE2AS01G
ICE2BS01
ICE2BS01G
Off-Line SMPS Current Mode
Controller
Power Management & Supply
Never stop thinking.






2AS01 Datasheet, Funktion
Preliminary Specification
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ICE2AS01/G
ICE2BS01/G
Representative Blockdiagram
2 Representative Blockdiagram
Figure 2
Datasheet
Preliminary Data
6
February 2002

6 Page









2AS01 pdf, datenblatt
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Preliminary Specification
ICE2AS01/G
ICE2BS01/G
Functional Description
transistors as well as to protect them against
undesirable gate overvoltages.
PW M-Latch
1
VCC
Z1
G a te
failure modes are latched by an Error-Latch. Additional
thermal shutdown is latched by the Error-Latch. In case
of those failure modes the Error-Latch is set after a
blanking time of 5µs and the external Power Switch is
shut down. That blanking prevents the Error-Latch from
distortions caused by spikes during operation mode.
3.8.1
Overload & Open loop with normal
load
Overload & Open loop/normal load
5µs Blanking
FB
4.8V
F a ilu re
D e te c tio n
Figure 17 Gate Driver
At voltages below the undervoltage lockout threshold
VVCCoff the gate drive is active low.
The driver-stage is optimized to minimize EMI and to
provide high circuit efficiency. This is done by reducing
the switch on slope when reaching the external Power
Switch threshold. This is achieved by a slope control of
the rising edge at the drivers output (see Figure 18).
V Gate ca. t = 130ns
S o ftS
5.3V
D riv e r
Soft-Start Phase
T Burst1
T Restart
t
t
CLoad = 1nF
VCC
5V 13.5V
t
Figure 18 Gate Rising Slope
8.5V
t
t
Thus the leading switch on spike is minimized. When
the external Power Switch is switched off, the falling
shape of the driver is slowed down when reaching 2V
to prevent an overshoot below ground. Furthermore the
driver circuit is designed to eliminate cross conduction
of the output stage.
Figure 19 Auto Restart Mode
Figure 19 shows the Auto Restart Mode in case of
overload or open loop with normal load. The detection
of open loop or overload is provided by the Comparator
C3, C4 and the AND-gate G2 (see Figure20).
3.8 Protection Unit (Auto Restart Mode)
An overload, open loop and overvoltage detection is
integrated within the Protection Unit. These three
Datasheet
Preliminary Data
12
February 2002

12 Page





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