ELMOS E910.22

BUS IC
DC/DC CONVERTER
MOTOR DRIVER IC
RIPPLE COUNTER
DRIVER IC
I/O IC
SENSOR IC
SENSOR INTERFACE IC
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
ÿ Wide range SMPS with watchdog
FEATURES
E910.22
APPLICATION
ÿ
Flyback converter with wide input range of 3V to 55V
ÿ
Automotive electronics
ÿ
5V first output voltage
ÿ
Controller and sensor supply
ÿ
Additional output voltages possible with additional
PINNING
PACKAGE
Pin
Name
Description
1
VDRV
2
DRV
3
PGND
Driver stage power ground
4
K15D
K15 terminal signal level detection
5
HOLD
Hold signal input
6
ON
Unconditional SMPS power up, active high
7
TCL
Watchdog timer clear input signal; active low
Disable watchdog input, active low
Bypass capacitor input for driver stage
power supply
Driver stage output signal
windings on transformer
DESCRIPTION
ÿ
Softstart capability
The IC is developed and optimized for automotive applications
ÿ
ON control-input with wide input voltage range
where it can generate different output voltages as a flyback con-
ÿ
Precise, programmable windowed watchdog
verter. The input voltage may be higher or lower than the output
ÿ
Low standby current (50µA typical)
voltage. The multi-loop-regulation concept ensures fast response
ÿ
Open load stable
to variation of input voltage and load. The reset circuit generates
ÿ
Snapback output current after short circuit on load
a reliable reset signal until the output is in tolerance and the inte-
8
DWD
ÿ
K15D control-input
grated, programmable windowed watchdog guarantees a mini-
9
SYS_EN
ÿ
Self-oscillating, multi-loop-regulation
mum and maximum software reset time. An additional system-
ÿ
Non dissipating primary current simulation
enable output enables critical components after the controller
10
RESET
ÿ
Degausing input and variable delayed switch on
has served the watchdog three times to guarantee a save control-
11
RWD
Resistor input for watchdog oscillator timing
ÿ
Push/pull driver for logic level Power-MOSFET
ler wake up sequence. This successful wake up also enables the
12
DEG
Resistor input for degausing detection
ÿ
No current shunt needed
‘HOLD’-capability so that the controller can keep the converter
13
RES
Resistor input for resonance delay adjustment
ÿ
– 40°C to + 125 ºC operating temperature
running without ‘ON’ and ‘K15D’ active.
14
CMP
Error amplifier compensation output
ÿ
Additional system-enable output for critical
15
RDC
Resistor input for drain current simulation
16
VOUT
Feedback input of SMPS outer regulation loop
17
AGND
Analog ground
18
VS
Supply voltage input
19
VSM
20
VAUX
modules
ÿ
SO 20w package
BLOCK DIAGRAM
VDRV
1
20
DRV
2
19
PGND
3
18
K15D
4
17
HOLD
5
16
ON
6
15
TCL
7
14
DWD
8
13
SYS_EN
9
12
10
11
RESET
VAUX
VSM
VS
AGND
VOUT0
RDC
CMP
RES
DEG
RWD
Watchdog system enable,
open drain output, active low
Watchdog reset pulse open drain output, active low
Bypass capacitor input for internal
circuits power supply
Auxiliary voltage input for internal circuits
VBAT
VS
RRDC
RDC
VSM
VDRV
internal
Supply
FET
DRV
RWD
PGND
TCL
DWD
DRV
watchdog
DEG
RESET
SYS_EN
RES
SMPS
ON
VAUX
Circuit
HOLD
VOUT
control
K15
CMP
K15D
AGND
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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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