UC3725 Unitrode, UC3725 Datasheet

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UC3725

Manufacturer Part Number
UC3725
Description
Isolated High Side FET Driver
Manufacturer
Unitrode
Datasheet
1/94
Isolated High Side FET Driver
FEATURES
BLOCK DIAGRAM
Receives Both Power and Signal Across
the Isolation Boundary
9 to 15 Volt High Level Gate Drive
Under-voltage Lockout
Programmable Over-current Shutdown
and Restart
Output Enable Function
DESCRIPTION
The UC1725 and its companion chip, the UC1724, provide all the nec-
essary features to drive an isolated MOSFET transistor from a TTL in-
put signal. A unique modulation scheme is used to transmit both power
and signals across an isolation boundary with a minimum of external
components.
Protection circuitry, including under-voltage lockout, over-current shut-
down, and gate voltage clamping provide fault protection for the MOS-
FET. High level gate drive is guaranteed to be greater than 9 volts and
less than 15 volts under all conditions.
Uses include isolated off-line full bridge and half bridge drives for driv-
ing motors, switches, and any other load requiring full electrical isola-
tion.
The UC1725 is characterized for operation over the full military tem-
perature range of -55°C to +125°C while the UC2725 and UC3725 are
characterized for -25°C to +85°C and 0°C to +70°C respectively.
UC1725
UC2725
UC3725
UDG-92051-1

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UC3725 Summary of contents

Page 1

... The UC1725 is characterized for operation over the full military tem- perature range of -55°C to +125°C while the UC2725 and UC3725 are characterized for -25°C to +85°C and 0°C to +70°C respectively. UC1725 ...

Page 2

... UC2725 UC3725 PACKAGE PIN FUNCTION FUNCTION PIN N/C I SENSE N/C 3-5 Timing Enable N/C 8-9 Input A N/C 12-14 Input B Gnd V CC N/C 18-19 Output DIL-16 (Top View Package +125 C for A +70 C for UC3725; V (pin pin numbers refer to DIL-8 package.) MIN TYP MAX .55 .7 1.1 1.5 -1 -10 0.4 0.5 0.6 100 250 6.3 7.0 7.7 1.9 2.0 2.3 = 25°C 7 ...

Page 3

... Figure 2. This is accomplished by setting (resetting) the comparator only if the input signal ex- ceeds Vcc (-Vcc). In some cases it may be necessary to +85 C for UC2725 +70 C for UC3725 =2.2nf pin numbers refer to DIL-8 package.) ...

Page 4

... Note that the UC1725 is still used to provide power, drive and protection circuitry for the power FET. UDG-92052 FIGURE 6 - Using Enable Pin as a High Speed Input 4 UC1725 UC2725 UC3725 OFF UDG-92053 Path ...

Page 5

Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, ...

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