UC3527 Series

Enhanced 35V, Dual 0.4A 400KHz PWM controller with high output when off, 0C to 70C

Catalog(2 parts)

Part	Operating Temperature▲▼	Operating Temperature▲▼	Function	Output Type	Frequency - Switching▲▼	Frequency - Switching▲▼	Output Configuration	Supplier Device Package	Topology	Clock Sync▲▼	Duty Cycle (Max)▲▼	Mounting Type	Synchronous Rectifier▲▼	Package / Case▲▼	Package / Case	Number of Outputs▲▼	Voltage - Supply (Vcc/Vdd)▲▼	Voltage - Supply (Vcc/Vdd)▲▼	Control Features	Output Phases▲▼
Texas Instruments UC3527ANG4 Buck, Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull Regulator Positive Output Step-Up, Step-Down, Step-Up/Step-Down DC-DC Controller IC 16-PDIP	70 °C	0 °C	Step-Down, Step-Up, Step-Up/Step-Down	Transistor Driver	400000 Hz	100 Hz	Positive	16-PDIP	Boost, Buck, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull		0.4900000095367432 ul	Through Hole		0.007619999814778566 m, 0.007619999814778566 m	16-DIP	2 ul	35 V	8 V	Enable, Frequency Control, Soft Start	1 ul
Texas Instruments UC3527BN Forward Converter, Push-Pull Regulator Positive Output Step-Up/Step-Down DC-DC Controller IC 16-PDIP	70 °C	0 °C	Step-Up/Step-Down	Transistor Driver	400000 Hz	100 Hz	Positive	16-PDIP	Forward Converter, Push-Pull		0.4900000095367432 ul	Through Hole		0.007619999814778566 m, 0.007619999814778566 m	16-DIP	2 ul	35 V	8 V	Enable, Frequency Control, Soft Start	1 ul

Key Features

• 8-V to 35-V Operation5.1-V Reference Trimmed to 1%100-Hz to 500-kHz Oscillator RangeSeparate Oscillator Sync TerminalAdjustable Dead-Time ControlInternal Soft StartPulse-by-Pulse ShutdownInput Undervoltage Lockout With HysteresisLatching PWM to Prevent Multiple PulsesDual Source and Sink Output Drivers8-V to 35-V Operation5.1-V Reference Trimmed to 1%100-Hz to 500-kHz Oscillator RangeSeparate Oscillator Sync TerminalAdjustable Dead-Time ControlInternal Soft StartPulse-by-Pulse ShutdownInput Undervoltage Lockout With HysteresisLatching PWM to Prevent Multiple PulsesDual Source and Sink Output Drivers

Description

The UC1525A/1527A series of pulse width modulator integrated circuits are designed to offer improved performance and lowered external parts count when used in designing all types of switching power supplies. The on-chip 5.1-V reference is trimmed to 1% and the input common-mode range of the error amplifier includes the reference voltage, eliminating external resistors. A sync input to the oscillator allows multiple units to be slaved or a single unit to be synchronized to an external system clock. A single resistor between CTand the discharge terminals provides a wide range of dead-time adjustment. These devices also feature built-in soft-start circuitry with only an external timing capacitor required. A shutdown terminal controls both the soft-start circuitry and the output stages, providing instantaneous turn off through the PWM latch with pulsed shutdown, as well as soft-start recycle with longer shutdown commands. The UC1525A/1527A series of pulse width modulator integrated circuits are designed to offer improved performance and lowered external parts count when used in designing all types of switching power supplies. The on-chip 5.1-V reference is trimmed to 1% and the input common-mode range of the error amplifier includes the reference voltage, eliminating external resistors. A sync input to the oscillator allows multiple units to be slaved or a single unit to be synchronized to an external system clock. A single resistor between CTand the discharge terminals provides a wide range of dead-time adjustment. These devices also feature built-in soft-start circuitry with only an external timing capacitor required. A shutdown terminal controls both the soft-start circuitry and the output stages, providing instantaneous turn off through the PWM latch with pulsed shutdown, as well as soft-start recycle with longer shutdown commands.