Cherry Semiconductor CS5101EN14, CS5101EDWR16, CS5101EDW16 Datasheet

1

Features

■

1.5A Peak Output
(Grounded Totem Pole)

■

8V to 75V Gate Drive Voltage

■

8V to 45V Supply Voltage

■

300ns Propagation Delay

■

1% Error Amplifier
Reference Voltage

■

Lossless Turn On and
Turn Off

■

Sleep Mode: < 100µA

■

Overcurrent Protection with
Dedicated Differential Amp

■

Synchronization to External
Clock

■

External Power Switch
Drain Voltage Monitor

Package Options

16L SO Wide

14L PDIP

CS5101

Secondary Side Post Regulator for AC/DC

and DC/DC Multiple Output Converters

SYNC

V

CC

V

REF

DGnd

V

FB

COMP

RAMP

V

C

PGnd

IS-

IS+

IS COMP

V

D

V

G

PGnd

AGnd

SYNC

V

CC

V

REF

LGnd

V

FB

COMP

RAMP

V

C

PGnd

IS-

IS+

IS COMP

V

D

V

G

CS5101

Description

The CS5101 is a bipolar monolithic
secondary side post regulator
(SSPR) which provides tight regula­tion of multiple output voltages in
AC-DC or DC-DC converters.
Leading edge pulse width modula­tion is used with the CS5101.

The CS5101 is designed to operate
over an 8V to 45V supply voltage
(VCC) range and up to a 75V drive
voltage (VC).

The CS5101 features include a totem
pole output with 1.5A peak output
current capability, externally pro­grammable overcurrent protection,
an on chip 2% precision 5V refer­ence, internally compensated error
amplifier, externally synchronized
switching frequency, and a power
switch drain voltage monitor. It is
available in a 14 lead plastic DIP or
a 16 lead wide body SO package.

Application Diagram

Cherry Semiconductor Corporation

2000 South County Trail, East Greenwich, RI 02818

Tel: [phone] Fax: [phone]

Email: [e-mail]

Web Site: www.cherry-semi.com

A Company

¨

Rev. 3/31/97

V

SY

TR

C

R1

1

C

R4

3

L1

Q1

6

R5

4

C

R6

R5

C5

+

R10

5

R8

R11

R12

R9

R14

R13

Gnd

V

OUT

+

C6

1

R1

+

R2

C

R3

R2

R4

C1

C2

C3

V
V

V
LGnd
V
COMP

RAMP

2

C

SYNC
CC

REF

FB

R

C

R3

CS5101

SSPR

PGnd

IS COMP

R7

V

D

V

C

V

G

C4

IS-

IS+

1

2

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

CS5101

Absolute Maximum Ratings

Power Supply Voltage, VCC.....................................................................................................................................-0.3V to 45V

V

SYNC

and Output Supply Voltages, VC, VG, V

SYNC

, VD.....................................................................................-0.3V to 75V

VIS+, VIS- (VCCÐ 4V, up to 24V)..................................................................................................................................-0.3 to 24V

V

REF

, VFB, V

COMP

, V

RAMP

, V

ISCOMP

............................................................................................................................-0.3 to 10V

Operating Junction Temperature, TJ.......................................................................................................................-40 to 150¡C

Operating Temperature Range ..................................................................................................................................-40 to 85¡C

Storage Temperature Range ....................................................................................................................................-65 to 150¡C

Output Energy (capacitive load per cycle).............................................................................................................................5µJ

ESD Human Body ....................................................................................................................................................................2kV

ESD Machine Model...............................................................................................................................................................200V

Lead Temperature Soldering

Wave Solder (through hole styles only)....................................................................................10 sec. max, 260¡C peak

Reflow (SMD styles only).....................................................................................60 sec. max above 183¡C, 230¡C peak

Electrical Characteristics:

-40¡C ² TA² 85¡C; -40¡C ² TJ² 150¡C; 10V < VCC< 45V; 8V < VC<75V unless otherwise specified.

■ Error Amplifier

Input Voltage Initial Accuracy V

FB

= V

COMP

; VCC= 15V; 1.98 2.00 2.02 V

T = 25¡C (Note 1)

Input Voltage V

FB

= V

COMP

, includes line and temp 1.94 2.00 2.06 V

Input Bias Current V

FB

= 0V; IVFBflows out of pin 500 nA

Open Loop Gain 1.5V < V

COMP

< 3.0V 60 70 dB

Unity Gain Bandwidth 1.5V < V

COMP

< 3.0V; (Note 1) 0.7 1.0 MHz

Output Sink Current V

COMP

= 2.0V; VFB= 2.2V 2 8 mA

Output Source Current V

COMP

= 2.0V; VFB= 1.8V 2 6 mA

V

COMP

High VFB= 1.8V 3.3 3.5 3.7 V

V

COMP

Low VFB= 2.2V 0.85 1.0 1.15 V

PSRR 10V < V

CC

< 45V; 60 70 dB

V

FB

= V

COMP

(Note 1)

■ Voltage Reference

Output Voltage Initial Accuracy V

CC

= 15V; T = 25¡C (Note 1) 4.9 5.0 5.1 V

Output Voltage 0A < I

REF

< 8mA 4.8 5.0 5.2 V

Line Regulation 10V < V

CC

< 45V; I

REF

= 0A 10 60 mV

Load Regulation 0A < I

REF

< 8mA 20 60 mV

Current Limit V

REF

= 4.8V 10 50 mA

V

REF

_OK FAULT V V

SYNC

= 5V; V

REF

= V

LOAD

4.10 4.40 4.60 V

V

REF

_OK V V

SYNC

= 5V; V

REF

= V

LOAD

4.30 4.50 4.80 V

V

REF

_OK Hysteresis 40 100 250 mV

■ Current Sense Amplifier

IS COMP High V IS

+

= 5V; ISÐ= IS COMP 4.7 5.0 5.3 V

IS COMP Low V IS

+

= 0V; ISÐ= IS COMP 0.5 1.0 1.3 V

Source Current IS

+

= 5V; ISÐ= 0V 2.0 10 mA

Sink Current IS

-

= 5V; IS+= 0V 10 20 mA

Open Loop Gain 1.5V ² V

COMP

² 4.5V; RL= 4k½ 60 80 dB

CMRR (Note 1) 60 80 dB

PSRR 10V < V

CC

< 45V, (Note 1) 60 80 dB

Unity Gain Bandwidth 1.5V ² V

COMP

² 4.5V; RL= 4k½ (Note 1) 0.5 0.8 MHz

3

CS5101

Electrical Characteristics: continued

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

■ Current Sense Amplifier: continued

Input Offset Voltage V

IS

+ = 2.5V; VIS- = V

ISCOMP

-8 0 8 mV

Input Bias Currents V

IS

+ = VIS- = 0V; IISflows out of pins 20 250 nA

Input Offset Current (IS

+

, IS-) -250 0 250 nA

Input Signal Voltage Range (Note 1) -0.3 V

CC

-4.0 V

■ RAMP/SYNC Generator

Ramp Source Current Initial V

SYNC

= 5V, V

RAMP

= 2.5V ; T = 25¡C 0.18 0.20 0.22 mA

Accuracy (Note 1)

Ramp Source Current V

SYNC

= 5V; V

RAMP

= 2.5V 0.16 0.20 0.24 mA

Ramp Sink Current V

SYNC

= 0V; V

RAMP

= 2.5V 1.0 4.0 mA

RAMP Peak Voltage V

SYNC

= 5V 3.3 3.5 3.7 V

RAMP Valley Voltage V

SYNC

= 0V 1.4 1.5 1.6 V

RAMP Dynamic Range V

RAMPDR

= V

RAMPPK

Ð V

RAMPVY

1.7 2.0 2.3 V

RAMP Sleep Threshold Voltage V

RAMP

@ V

REF

< 2.0V 0.3 0.6 1.0 V

SYNC Threshold V

SYNC

@ V

RAMP

> 2.5V 2.3 2.5 2.7 V

SYNC Input Bias Current V

SYNC

= 0V; I

SYNC

flows out of pin 1 20 µA

■ Output Stage

V

G

, High V

SYNC

= 5V; IVG= 200mA, VCÐ V

G

1.6 2.5 V

V

G

, Low V

SYNC

= 0V; IVG= 200mA 0.9 1.5 V

V

G

Rise Time Switch V

SYNC

High; CG= 1nF; 30 75 ns

VCC= 15V; measure 2V to 8V

V

G

Fall Time Switch V

SYNC

Low; CG= 1nF 40 100 ns

VCC= 15V; measure 8V to 2V

V

G

Resistance to Gnd Remove supplies; VG= 10V 50 100 k½

V

D

Resistance to Gnd Remove supplies; VD= 10V 500 1500 ½

■ General

I

CC

, Operating V

SYNC

= 5V 12 18 mA

I

CC

in UVL VCC= 6V 300 500 µA

I

CC

in Sleep Mode High V

RAMP

= 0V; VCC= 45V 80 200 µA

I

CC

In Sleep Mode Low V

RAMP

= 0V; VCC= 10V 20 50 µA

I

C

, Operating High V

SYNC

= 5V; V

FB

= VISÐ = 0V; 4 8 mA

VC= 75V

I

C

, Operating Low V

SYNC

= 5V; V

FB

= VISÐ = 0V; VC= 8V 3 6 mA

UVLO Start Voltage 7.4 8.0 9.2 V

UVLO Stop Voltage 6.4 7.0 8.3 V

UVLO Hysteresis 0.8 1.0 1.2 V

Leading Edge, t

DELAY

V

SYNC

= 2.5V to VG= 8V 280 ns

Trailing Edge, t

DELAY

V

SYNC

= 2.5V to VG= 2V 750 ns

Note 1: Guaranteed by design. Not 100% tested in production.