E910.22 Datasheet, PDF (1/1 Pages) ELMOS Semiconductor AG – Wide range SMPS with watchdog

BUS IC
DC/DC CONVERTER
ÿ Wide range SMPS with watchdog
Wide range SMPS with reset
PFM controller family
Step down converter, fully integrated
Step down converter, for external FET
PWM controller for LED
MOTOR DRIVER IC
RIPPLE COUNTER
ÿ Wide range SMPS with watchdog
FEATURES
ÿ Flyback converter with wide input range of 3V to 55V
ÿ 5V first output voltage
ÿ Additional output voltages possible with additional
windings on transformer
ÿ Softstart capability
ÿ ON control-input with wide input voltage range
ÿ Precise, programmable windowed watchdog
ÿ Low standby current (50µA typical)
ÿ Open load stable
ÿ Snapback output current after short circuit on load
ÿ K15D control-input
ÿ Self-oscillating, multi-loop-regulation
ÿ Non dissipating primary current simulation
ÿ Degausing input and variable delayed switch on
ÿ Push/pull driver for logic level Power-MOSFET
ÿ No current shunt needed
ÿ – 40°C to + 125 ºC operating temperature
ÿ Additional system-enable output for critical
modules
ÿ SO 20w package
APPLICATION
ÿ Automotive electronics
ÿ Controller and sensor supply
DESCRIPTION
The IC is developed and optimized for automotive applications
where it can generate different output voltages as a flyback con-
verter. The input voltage may be higher or lower than the output
voltage. The multi-loop-regulation concept ensures fast response
to variation of input voltage and load. The reset circuit generates
a reliable reset signal until the output is in tolerance and the inte-
grated, programmable windowed watchdog guarantees a mini-
mum and maximum software reset time. An additional system-
enable output enables critical components after the controller
has served the watchdog three times to guarantee a save control-
ler wake up sequence. This successful wake up also enables the
‘HOLD’-capability so that the controller can keep the converter
running without ‘ON’ and ‘K15D’ active.
BLOCK DIAGRAM
24
VBAT
VS
VSM
internal
Supply
RWD
TCL
DWD
RESET
SYS_EN
watchdog
ON
HOLD
control
K15
K15D
RRDC
RDC
FET
DRV
SMPS
Circuit
AGND
VDRV
DRV
PGND
DEG
RES
VAUX
VOUT
CMP
DRIVER IC
I/O IC
SENSOR IC
SENSOR INTERFACE IC
PINNING
Pin Name
1
VDRV
2
DRV
3
PGND
4
K15D
5
HOLD
6
ON
7
TCL
8
DWD
9
SYS_EN
10 RESET
11
RWD
12
DEG
13
RES
14 CMP
15
RDC
16 VOUT
17
AGND
18 VS
19 VSM
20 VAUX
Description
Bypass capacitor input for driver stage
power supply
Driver stage output signal
Driver stage power ground
K15 terminal signal level detection
Hold signal input
Unconditional SMPS power up, active high
Watchdog timer clear input signal; active low
Disable watchdog input, active low
Watchdog system enable,
open drain output, active low
Watchdog reset pulse open drain output, active low
Resistor input for watchdog oscillator timing
Resistor input for degausing detection
Resistor input for resonance delay adjustment
Error amplifier compensation output
Resistor input for drain current simulation
Feedback input of SMPS outer regulation loop
Analog ground
Supply voltage input
Bypass capacitor input for internal
circuits power supply
Auxiliary voltage input for internal circuits
E910.22
PACKAGE
VDRV
1
DRV
2
PGND
3
K15D
4
HOLD
5
ON
6
TCL
7
DWD
8
SYS_EN
9
RESET
10
20
VAUX
19
VSM
18
VS
17
AGND
16
VOUT0
15
RDC
14
CMP
13
RES
12
DEG
11
RWD
Note ELMOS Semiconductor AG (below ELMOS) reserves the right to make changes to the product contained in this publication without notice. ELMOS assumes no responsibility for the use of any
circuits described herein, conveys no licence under any patent or other right, and makes no representation that the circuits are free of patent infringement. While the information in this publication
has been checked, no responsibility, however, is assumed for inaccuracies. ELMOS does not recommend the use of any of its products in life support applications where the failure or malfunction of
the product can reasonably be expected to cause failure of a life-support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications.
Copyright © 2005 ELMOS Reproduction, in part or whole, without the prior written consent of ELMOS, is prohibited.
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elmos product catalog june 2005
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