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Design Note
UC1525B/UC1527B DEVICES
Comparison Summary to UC1525A/27A Devices
The UC1525B and UC1527B devices are enhanced
versions of the previous generation of UC1525A
and UC1527A devices. They are pin-for-pin
compatible and direct replacements for the “A”
versions in
almost all applications. Significnt improvements
have been made in the 5.1 V reference voltage and
the output drivers as itemized in the tables below.
PARAMETER NEW: UC1515B/27B
OLD: UC1525A/27A
REFERENCE VOLTAGE
VREF (min)
VREF (max)
Line Regulation (max)
5.062 V
5.05 v
5.138 V
5.15 v
+/- 10 mV
+/-20 mV
Load Regulation (max)
+/-15 mV +/-50 mV
Temperature Stability (max)
+/-30 mV +/-50 mV
Total Output Variation (max)
5.036 V to 5.164 V 5.00 V to 5.20V
Long Term Stability (max)
+/-10 mV +/-50 mV
Temperature Coefficient (typ)
PWM OUTPUT SECTION
8 ppm/deg. C
Minimum On-Time (typ)
350 nS 600 nS
Cross Conduction
30 nC
150 nC
SUPPLY CURRENT
ICC Increase (40 kHz to 400 kHz)
15 mA (max)
40 mA (typ)
ESD PROTECTION
Discharge Withstand Voltage (typ)
2 kV (typ all pins) no protection
UNITRODE CORPORATION
7 CONTINENTAL BLVD.
l MERRIMACK. NH 03054
TEL. (603) 424-2410
l FAX (603) 424-3460
4-13
