TPS5206 Datasheet, PDF (1/7 Pages) Texas Instruments – SWITCHING-POWER-SUPPLY CONTROL CIRCUIT

TPS5206CN
SWITCHING-POWER-SUPPLY CONTROL CIRCUIT
• Single-Chip Switching-Power-Supply
Control With Limited External Components
• Built-In PWM Control Circuit
• Open-Collector Output for Direct Drive of
Transformer
• Variable Dead-Time Control
• Overvoltage and Undervoltage Detection
and Latch-Up for Each Supply Voltage:
5 V, 12 V, – 5 V, and – 12 V
• System Overcurrent Protection
• Wide Supply Range From 7 V to 40 V
• Power-Good Indicator Function
SLVS082A – APRIL 1994 – REVISED SEPTEMBER 1994
N PACKAGE
(TOP VIEW)
REF ₁
PGO 2
SVP5 3
SVP12 4
CPR 5
DT 6
CUV 7
SVN5 8
SVN12 9
D1 10
20 ^CPG
19 PGI
18 EA +
17 EA –
16 EAO
15 V_CC
14 SC
13 CT
12 D2
11 GND
description
The TPS5206CN is a bipolar monolithic integrated circuit designed for push-pull-type switching-power-supply
(SPS) control in desktop PC applications. It offers pulse-width-modulation (PWM) control and power-supply
supervisor functions, including detection of undervoltage and overvoltage conditions on ± 5 V and ± 12 V system
supplies. It also detects overcurrent conditions on the SPS system output. This single chip reduces the total
component count and provides additional design flexibility, which minimizes cost and printed-circuit-board
(PCB) space requirements in present and new SPS designs.
overvoltage-protection lockout feature
The overvoltage-protection lockout feature monitors four different supply voltages. When an overvoltage (OV)
condition is detected, the power-good output (PGO) is set low and the PWM function is disabled. The OV
condition is detected on the SVP5, SVP12, SVN5, and SVN12 inputs. Threshold voltages are typically 5.9 V,
14.1 V, – 8.4 V, and – 15.3 V, respectively.
undervoltage-protection lockout feature
The undervoltage-protection lockout feature monitors four different supply voltages. When an undervoltage
(UV) condition is detected, the power-good output (PGO) is set low and the PWM function is disabled. The UV
condition is detected on the SVP5, SVP12, SVN5, and SVN12 inputs. Threshold voltages are typically 3.9 V,
9.5 V, – 3.4 V, and – 9.3 V, respectively.
overcurrent-protection lockout feature
The overcurrent (OC) protection lockout feature is designed to protect the SPS from excessive load or
short-circuit conditions. The circuit converts the output current of the SPS to a voltage, which is then monitored
at SC. It sets PG low and shuts down the PWM circuit when the sensed voltage is higher than 5 V.
reference regulator
The internal 5-V reference regulator is designed primarily to provide the internal circuitry with a stable supply
rail for varying input voltages. The regulator employs a band-gap circuit as its primary reference to maintain
thermal stability of less than 100-mV variation over the operating free-air temperature range of 0°C to 70°C. In
addition to supplying an internal reference, the regulator provides a precision 5-V reference that can support
5 mA of load current for external bias circuits. The regulated voltage has a margin of error of 2%. Short-circuit
protection is provided to protect the internal circuit from overload or short-circuit conditions.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright © 1994, Texas Instruments Incorporated
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