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UC2825AMDWREP Datasheet(PDF) 3 Page - Texas Instruments |
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UC2825AMDWREP Datasheet(HTML) 3 Page - Texas Instruments |
3 / 21 page 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 INV NI EAOUT CLK/LEB RT CT RAMP SS VREF VCC OUTB VC PGND OUTA GND ILIM DW PACKAGE (TOP VIEW) UC2825A-EP www.ti.com SGLS305D – JULY 2005 – REVISED SEPTEMBER 2010 PIN ASSIGNMENTS TERMINAL FUNCTIONS TERMINAL I/O DESCRIPTION NAME NO. CLK/LEB 4 O Clock/leading-edge blanking. Output of the internal oscillator. Capacitor timing. Timing capacitor connection for oscillator frequency programming. The timing capacitor CT 6 I should be connected to the device ground using minimal trace length. EAOUT 3 O Output of the error amplifier for compensation GND 10 Analog ground return ILIM 9 I Input to the current-limit comparator INV 1 I Inverting input to the error amplifier NI 2 I Noninverting input to the error amplifier OUTA 11 O High-current totem-pole output A of the on-chip drive stage OUTB 14 O High-current totem-pole output B of the on-chip drive stage PGND 12 Ground return for the output driver stage Noninverting input to the PWM comparator, with 1.25-V internal input offset. In voltage-mode operation, this RAMP 7 I serves as the input voltage feed-forward function by using the CT ramp. In peak current mode operation, this serves as the slope compensation input. RT 5 I Resistor timing. Timing resistor connection for oscillator frequency programming. SS 8 I Soft-start. SS also doubles as the maximum duty cycle clamp. Power-supply for the output stage. This pin should be bypassed with a 0.1-mF monolithic ceramic low-ESL VC 13 capacitor with minimal trace lengths. Power supply for the device. This pin should be bypassed with a 0.1-mF monolithic ceramic low-ESL VCC 15 O capacitor with minimal trace lengths. 5.1-V reference. For stability, the reference should be bypassed with a 0.1-mF monolithic ceramic low-ESL VREF 16 capacitor and minimal trace length to the ground plane. Copyright © 2005–2010, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Link(s): UC2825A-EP |
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