High Stability Isolated Error Amplifier

Data Sheet

ADuM3190

Rev. 0

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FEATURES

Stable over time and temperature

0.5% initial accuracy

1% accuracy over the full temperature range

Compatible with Type II or Type III compensation networks

Reference voltage: 1.225 V

Compatible with DOSA

Low power operation: <7 mA total

Wide voltage supply range

Bandwidth: 400 kHz

Isolation voltage: 2.5 kV rms

Safety and regulatory approvals (pending)

UL recognition: 2500 V rms for 1 minute per UL 1577

CSA Component Acceptance Notice #5A

VDE certificate of conformity

DIN V VDE V 0884-10 (VDE V 0884-10):2006-12

Wide temperature range

−40°C to +125°C ambient operation

150°C maximum junction temperature

APPLICATIONS

Linear power supplies

Inverters

Uninterruptible Power Supply (UPS)

DOSA-compatible modules

Voltage monitors

GENERAL DESCRIPTION

The ADuM31901 is an isolated error amplifier based on Analog

Devices, Inc., iCoupler® technology. The ADuM3190 is ideal for

linear feedback power supplies. The primary side controllers of

the ADuM3190 enable improvements in transient response,

power density, and stability as compared to commonly used

optocoupler and shunt regulator solutions.

Unlike optocoupler-based solutions, which have an uncertain

current transfer ratio over lifetime and at high temperatures, the

ADuM3190 transfer function does not change over its lifetime

and it is stable over a wide temperature range of −40°C to +125°C.

Included in the ADuM3190 is a wideband operational amplifier

for a variety of commonly used power supply loop compensation

techniques. The ADuM3190 is fast enough to allow a feedback

loop to react to fast transient conditions and overcurrent condi-

tions. Also included is a high accuracy 1.225 V reference to

compare with the supply output setpoint.

The ADuM3190 is packaged in a small 16-lead QSOP package

for a 2.5 kV rms isolation voltage rating.

FUNCTIONAL BLOCK DIAGRAM

Figure 1.

1

Protected by U.S. Patents 5,952,849, 6,873,065 and 7,075,329. Other patents pending.

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16

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Tx

Rx

REF

REF

REG

REG

UVLO

UVLO

COMP

–IN

+IN

NC