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NON-ISOLATED DC/DC CONVERTERS
5V Input / 0.9V - 3.3V Output / 8A SRAH-08B / VRAH-08B Series
* * * * * * * * * Nonisolated Compact, low profile surface mount package Fixed frequency High efficiency means less power dissipation Excellent thermal performance Optimized for cost Remote on/off Undervoltage lockout (UVLO) Over current and short circuit protection
POWER PRODUCTS
BP06xRAH-08B
RoHS Compliant
Description
The Bel SRAH-08B and VRAH-08B modules are a series of non-isolated, step down DC/DC power converters that operate from a nominal 5V source. These converters are available in a range of output voltages from 0.9V to 3.3V. They are packaged in a compact, overmolded package rated at 8A. Optional lead forming provides a vertical mount product for minimal footprint or a surface mount option for a very low profile. Standard features include remote on/off, over current and short circuit protection, output voltage adjust and industrial temperature range (-40 to +85 C). The output is closely regulated and the efficiency is typically 92% at full load. These products may be used almost anywhere low voltage silicon is employed and a 5V source is available. Typical applications include file servers, routers, line cards and other computing and communications equipment.
Applications
* * * * Distributed power architectures Data networking equipment Telecommunications Computers and peripherals
Part Number Selection
Output Voltage 3.3V 2.5V 1.8V 1.5V 1.2V 1.0V 0.9V 0.9V - 3.3V Input Voltage 5V 5V 5V 5V 5V 5V 5V 5V Max. Output Current 8A 8A 8A 8A 8A 8A 8A 8A Max. Output Power 26.4W 20W 14.4W 12W 9.6W 8W 7.2W 26.4W Typical Efficiency 92% 90% 86% 84% 82% 80% 79% 92% Part Number Surface Mount SRAH-08B330 SRAH-08B250 SRAH-08B180 SRAH-08B150 SRAH-08B120 SRAH-08B100 SRAH-08B090 SRAH-08B1A0 Part Number Vertical Mount VRAH-08B330 VRAH-08B250 VRAH-08B180 VRAH-08B150 VRAH-08B120 VRAH-08B100 VRAH-08B090 VVAH-08B1A0
(c)2006 Bel Fuse Inc.
Specifications subject to change without notice. 02.06
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com page 1
POWER PRODUCTS
BP06xRAH-08B
NON-ISOLATED DC/DC CONVERTERS
5V Input / 0.9V - 3.3V Output / 8A
Absolute Maximum Ratings
Parameter Continuous Input Voltage Output Enable Terminal Voltage Ambient Temperature Storage Temperature Symbol Vin Vouten Tamb Tstor Min -0.3 -0.3 -40 -55 Typical Max 6 6 85 125 Unit V V C C
Note: Use beyond the maximum ratings may cause a reliability degradation of the DC/DC converter or may permanently damage the device.
Input Specifications
Parameter Operating Input Voltage Input Current 3.3V 2.5V 1.8V 1.5V 1.2V 1.0V 0.9V No Load Input Current Remote Off Input Current Input Reflected Ripple Current1 Input Reflected Ripple Current (P-P)1 I2t Inrush Current Transient Turn On Voltage Threshold Turn Off Voltage Threshold All All All All All 4.19 All 9 50 150 0.02 4.3 3.8 Module All Symbol Vin Iin 7.3 5.6 4.3 3.6 3.0 2.5 2.3 80 15 80 200 0.05 4.5 4.49 mA mA mArms mApk A2s V V Min 4.5 Typical Max 5.5 Units V A
Note: Input capacitance one 270F/16V, ESR = 0.018 max at 100kHz @ 25 C. 1. With simulated source impedance of 500nH, 5Hz to 20MHz.
(c)2006 Bel Fuse Inc.
Specifications subject to change without notice. 02.06
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com page 2
NON-ISOLATED DC/DC CONVERTERS
5V Input / 0.9V - 3.3V Output / 8A Output Specifications
Parameter Output Voltage Set Point 1 3.3V 2.5V 1.8V 1.5V 1.2V 1.0V 0.9V Load Regulation 3.3V 2.5V 1.8V 1.5V 1.2V 1.0V 0.9V Line Regulation Regulation Over Temperature (-40 to +85 C) All 6 6 6 3 3 3 3 2 15 15 15 10 10 10 10 5 mV mV 3.3V 2.5V 1.8V 1.5V 1.2V 1.0V 0.9V 20 20 10 10 5 5 5 33 25 18 15 10 10 10 mV 3.3V 2.5V 1.8V 1.5V 1.2V 1.0V 0.9V Output Ripple and Noise 2 Output Ripple and Noise 2 Output Current Range Output DC Current Limit Shor t Circuit Surge 3.3V 2.5V 1.8V 1.5V 1.2V 1.0V 0.9V Turn on Time Overshoot at Turn On Output Capacitance All All All Cout 0 Ton All All All All Iout Ioutlim Ioutsurge 0.08 0.05 0.05 0.05 0.05 0.05 0.05 12 0 0.2 0.1 0.1 0.1 0.1 0.1 0.1 20 3 3300 ms % F 0 10.4 28 28 18 15 10 10 10 50 15 53 45 38 30 25 25 25 100 25 8 20 mVp-p mVrms A A A2s Module Symbol Vout 3.234 2.45 1.764 1.47 1.176 0.98 0.882 3.3 2.5 1.8 1.5 1.2 1.0 0.9 3.366 2.55 1.836 1.53 1.224 1.02 0.918 mV Min Typical Max Units V
POWER PRODUCTS
BP06xRAH-08B
Total Output Voltage Regulation
Note: All specifications are typical at nominal input, full load at 25 C unless otherwise stated. 1. Vin = 5V, Iout = full load, Ta = 25 C. 2. 0 - 20MHz, 1F ceramic cap and 10F aluminum cap on output.
(c)2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com page 3
POWER PRODUCTS
BP06xRAH-08B
NON-ISOLATED DC/DC CONVERTERS
5V Input / 0.9V - 3.3V Output / 8A
Output Specifications
Parameter Transient Response
3
Module
Symbol
Min
Typical
Max
Units
V 50% to 100% of Max Load Settling Time 3.3V V 100% to 50% of Max Load Settling Time Transient Response 3 V 50% to 100% of Max Load Settling Time 2.5V V 100% to 50% of Max Load Settling Time Transient Response
3
130 Ts 100 130 Ts 100
165 150 165 150
mV s mV s
130 Ts 30 120 Ts 30
165 60 165 60
mV s mV s
V 50% to 100% of Max Load Settling Time 1.8V V 100% to 50% of Max Load Settling Time Transient Response
3
120 Ts 25 120 Ts 25
165 50 165 50
mV s mV s
V 50% to 100% of Max Load Settling Time 1.5V V 100% to 50% of Max Load Settling Time Transient Response
3
100 Ts 25 100 Ts 25
150 50 150 50
mV s mV s
V 50% to 100% of Max Load Settling Time 1.2V V 100% to 50% of Max Load Settling Time Transient Response 3 V 50% to 100% of Max Load Settling Time 1.0V V 100% to 50% of Max Load Settling Time Transient Response 3 V 50% to 100% of Max Load Settling Time 0.9V V 100% to 50% of Max Load Settling Time Ts Ts Ts Ts Ts Ts
90 25 90 25
125 50 125 50
mV s mV s
70 25 70 25
110 50 110 50
mV s mV s
70 25 70 25
110 50 110 50
mV s mV s
Note: All specifications are typical at nominal input, full load at 25 C unless otherwise stated. 3. di/dt = 0.5A/S, Ta = 25 C without external load capacitance; when Vout=3.3V or 2.5V a 220F aluminum cap is added at output.
(c)2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com page 4
NON-ISOLATED DC/DC CONVERTERS
5V Input / 0.9V - 3.3V Output / 8A
POWER PRODUCTS
BP06xRAH-08B
General Specifications
Parameter Efficiency1 3.3V 2.5V 1.8V 1.5V 1.2V 1.0V 0.9V Switching Frequency Output Voltage Trim Range2 (Wide Trim) Output Voltage Trim Range2 (Narrow Trim) 3.3V 2.5V 1.8V 1.5V 1.2V 1.0V 0.9V Weight All 90 90 90 90 90 90 95 4.7 110 110 110 110 110 110 110 g All 1.8V Fsw Module Symbol 89 87 83 81 79 77 76 250 47.5 92 90 86 84 82 80 79 300 340 202 kHz % % Min Typical Max Units %
1. Vin=5V, full load and Ta=25 C. 2. See graphs on page 13 - 20.
Control Specifications
Parameter Remote On/Off
1
Module All Vin = 4.5V
Symbol Vouten
Min
Typical
Max
Units V
1.35 All -0.3 1.65 3.15 All 5.5 3.85 V V
Signal Low (Unit Off)2 Vin = 5.5V Vin = 4.5V Signal High (Unit On)2 Vin = 5.5V
1. With remote on/off pin 1 open, the module is on. 2. Signal low and signal high varies based on Vin. Note: On/off pin designed to work with an open collector/drain switch.
(c)2006 Bel Fuse Inc.
Specifications subject to change without notice. 02.06
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com page 5
POWER PRODUCTS
BP06xRAH-08B
NON-ISOLATED DC/DC CONVERTERS
5V Input / 0.9V - 3.3V Output / 8A
Efficiency Data
MODULE 3.3V 96% 95% 94% EFFICIENCY 93% 92% 91% 90% 89% 88% 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 OUTPUT CURRENT 4.5V 5.0V 5.5V
EFFICIENCY 95% 94% 93% 92% 91% 90% 89% 88% 87% 86% 1.0 2.0 3.0
MODULE 2.5V
4.5V 5.0V 5.5V
4.0
5.0
6.0
7.0
8.0
OUTPUT CURRENT
MODULE 1.8V 93%
92% 90% 88%
MODULE 1.5V
91% EFFICIENCY 4.5V 5.0V 87% 5.5V
EFFICIENCY
89%
4.5v 86% 84% 82% 80% 5.0v 5.5v
85%
83% 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 OUTPUT CURRENT
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
OUTPUT CURRENT
(c)2006 Bel Fuse Inc.
Specifications subject to change without notice. 02.06
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com page 6
NON-ISOLATED DC/DC CONVERTERS
5V Input / 0.9V - 3.3V Output / 8A Efficiency Data
MODULE 1.2V 90% 88% 86%
POWER PRODUCTS
BP06xRAH-08B
EFFICIENCY
4.5v 84% 82% 80% 78% 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 OUTPUT CURRENT 5.0v 5.5v
MODULE 1.0V 88% 86% EFFICIENCY 84% 82% 80% 78% 76% 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 OUTPUT CURRENT
4.5V 5.0V 5.5V
MODULE 0.9V 88% 86% EFFICIENCY 84% 82% 80% 78% 76% 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 OUTPUT CURRENT
4.5V 5.0V 5.5V
(c)2006 Bel Fuse Inc.
Specifications subject to change without notice. 02.06
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com page 7
POWER PRODUCTS
BP06xRAH-08B
NON-ISOLATED DC/DC CONVERTERS
5V Input / 0.9V - 3.3V Output / 8A
Ripple and Noise
1F ceramic cap and 10F aluminum electrolytic cap added at the output.
Ripple and noise at full load and 5Vdc input, 3.3Vdc output and Ta=25 C
Ripple and noise at full load and 5Vdc input, 2.5Vdc output and Ta=25 C
Ripple and noise at full load and 5Vdc input, 1.8Vdc output and Ta=25 C
Ripple and noise at full load and 5Vdc input, 1.5Vdc output and Ta=25 C
(c)2006 Bel Fuse Inc.
Specifications subject to change without notice. 02.06
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com page 8
NON-ISOLATED DC/DC CONVERTERS
5V Input / 0.9V - 3.3V Output / 8A Ripple and Noise
1F ceramic cap and 10F aluminum electrolytic cap added at the output.
POWER PRODUCTS
BP06xRAH-08B
Ripple and noise at full load and 5Vdc input, 1.2Vdc output and Ta=25 C
Ripple and noise at full load and 5Vdc input, 1.0Vdc output and Ta=25 C
Ripple and noise at full load and 5Vdc input, 0.9Vdc output and Ta=25 C
(c)2006 Bel Fuse Inc.
Specifications subject to change without notice. 02.06
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com page 9
POWER PRODUCTS
BP06xRAH-08B
NON-ISOLATED DC/DC CONVERTERS
5V Input / 0.9V - 3.3V Output / 8A
Transient Response
Transient response: di/dt = 0.5A/S, no external load capacitance. Note: 3.3Vdc and 2.5Vdc output with external 220uF aluminum capacitance.
Vout=3.3V 50% to 100% load transients at 5V input and Ta=25 C
Vout=3.3V 100% to 50% load transients at 5V input and Ta=25 C
Vout=2.5V 50% to 100% load transients at 5V input and Ta=25 C
Vout=2.5V 100% to 50% load transients at 5V input and Ta=25 C
Vout=1.8V 50% to 100% load transients at 5V input and Ta=25 C
(c)2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
Vout=1.8V 100% to 50% load transients at 5V input and Ta=25 C
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com page 10
NON-ISOLATED DC/DC CONVERTERS
5V Input / 0.9V - 3.3V Output / 8A Transient Response
Transient response: di/dt = 0.5A/S, no external load capacitance
POWER PRODUCTS
BP06xRAH-08B
Vout=1.5V 50% to 100% load transients at 5V input and Ta=25 C
Vout=1.5V 100% to 50% load transients at 5V input and Ta=25 C
Vout=1.2V 50% to 100% load transients at 5V input and Ta=25 C
Vout=1.2V 100% to 50% load transients at 5V input and Ta=25 C
Vout=1.0V 50% to 100% load transients at 5V input and Ta=25 C
Vout=1.0V 100% to 50% load transients at 5V input and Ta=25 C
(c)2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com page 11
POWER PRODUCTS
BP06xRAH-08B
NON-ISOLATED DC/DC CONVERTERS
5V Input / 0.9V - 3.3V Output / 8A
Transient Response
Transient response: di/dt = 0.5A/S, no external load capacitance
Vout=0.9V 50% to 100% load transients at 5V input and Ta=25 C
Vout=0.9V 100% to 50% load transients at 5V input and Ta=25 C
Thermal Considerations
SRAH-08B
VRAH-08B
(c)2006 Bel Fuse Inc.
Specifications subject to change without notice. 02.06
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com page 12
NON-ISOLATED DC/DC CONVERTERS
5V Input / 0.9V - 3.3V Output / 8A
POWER PRODUCTS
BP06xRAH-08B
Output Voltage Set-Point Adjustment
Trim Down Test Circuit
Vo
Trim Up Test Circuit
Vo
Trim
Trim
Gnd
Gnd
xRAH-08B1A0 Trim Resistor Calculation
3000
Trim resistor value Rtrim_down(Ohm)
2700 2400 2100 1800 1500 1200 900 600 300 0 0.85 0.94 1.04 1.14 1.23 1.33 1.42 1.52 1.61 A djus ted output voltage Vo,adj (V) 1.71 1.8
Rtrim -down
where,
250.362 =( - 261.1)ohm Vo - Vo, adj
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.805V Vo,adj is the adjusted output voltage. Rtrim-down is the resistance required between TRIM and Vo.
3000
Rtrim -up
where,
199.2 =( - 12.1)ohm Vo, adj - Vo
Trim resistor value,Rtrim_up(Ohm)
2700 2400 2100 1800 1500 1200 900 600 300 0 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 A djus ted output voltage Vo,adj(V) 3.6 3.8
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.805V Vo,adj is the adjusted output voltage. Rtrim-up is the resistance required between TRIM and GND.
(c)2006 Bel Fuse Inc.
Specifications subject to change without notice. 02.06
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com page 13
POWER PRODUCTS
BP06xRAH-08B
NON-ISOLATED DC/DC CONVERTERS
5V Input / 0.9V - 3.3V Output / 8A
Output Voltage Set-Point Adjustment
xRAH-08B330 Trim Resistor Calculation
1.55 . 10
4 4 4 4
Trim resistor value Rtrim_down(Ohm)
1.4 . 10 1.25 . 10 1.1 . 10
Rtrim -down
where,
623.741 =( - 651)ohm Vo - Vo, adj
9500 8000 6500 5000 3500 2000 500 2.8 2.85 2.9 2.95 3 3.05 3.1 3.15 3.2 A djus ted output voltage Vo,adj (V) 3.25 3.3
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=3.305V Vo,adj is the adjusted output voltage. Rtrim-down is the resistance required between TRIM and Vo.
1. 10
Trim resistor value,Rtrim_up(Ohm)
4
9000 8000 7000 6000 5000 4000 3000 2000 1000 0 3.3 3.35 3.4 3.45 3.5 3.55 3.6 3.65 3.7 A djus ted output voltage Vo,adj(V) 3.75 3.8
Rtrim -up = (
where,
199.2 - 402)ohm Vo, adj - Vo
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=3.305V Vo,adj is the adjusted output voltage. Rtrim-up is the resistance required between TRIM and GND.
(c)2006 Bel Fuse Inc.
Specifications subject to change without notice. 02.06
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com page 14
NON-ISOLATED DC/DC CONVERTERS
5V Input / 0.9V - 3.3V Output / 8A
POWER PRODUCTS
BP06xRAH-08B
Output Voltage Set-Point Adjustment
xRAH-08B250 Trim Resistor Calculation
1.5 . 10
4 4 4
Trim resistor value Rtrim_down(Ohm)
1.35 . 10 1.2 . 10
Rtrim -down
where,
423.933 =( - 760)ohm Vo - Vo, adj
4 1.05 . 10
9000 7500 6000 4500 3000 1500 0 2.1 2.14 2.18 2.22 2.26 2.3 2.34 2.38 2.42 A djus ted output voltage Vo,adj (V) 2.46 2.5
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=2.503V Vo,adj is the adjusted output voltage. Rtrim-down is the resistance required between TRIM and Vo.
1. 10
4
Rtrim -up
where,
199.2 =( - 511)ohm Vo, adj - Vo
Trim resistor value,Rtrim_up(Ohm)
9000 8000 7000 6000 5000 4000 3000 2000 1000 0 2.5 2.54 2.58 2.62 2.66 2.7 2.74 2.78 2.82 A djus ted output voltage Vo,adj(V) 2.86 2.9
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=2.503V Vo,adj is the adjusted output voltage. Rtrim-up is the resistance required between TRIM and GND.
(c)2006 Bel Fuse Inc.
Specifications subject to change without notice. 02.06
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com page 15
POWER PRODUCTS
BP06xRAH-08B
NON-ISOLATED DC/DC CONVERTERS
5V Input / 0.9V - 3.3V Output / 8A
Output Voltage Set-Point Adjustment
xRAH-08B180 Trim Resistor Calculation
1.5 . 10
4 4 4 4
Trim resistor value Rtrim_down(Ohm)
1.35 . 10 1.2 . 10 1.05 . 10
Rtrim -down
where,
250.362 =( - 760)ohm Vo - Vo, adj
9000 7500 6000 4500 3000 1500 0 1.5 1.53 1.56 1.59 1.62 1.65 1.68 1.71 1.74 A djus ted output voltage Vo,adj (V) 1.77 1.8
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.805V Vo,adj is the adjusted output voltage. Rtrim-down is the resistance required between TRIM and Vo.
1. 10
4
Rtrim -up = (
where,
Trim resistor value,Rtrim_up(Ohm)
199.2 - 511)ohm Vo, adj - Vo
9000 8000 7000 6000 5000 4000 3000 2000 1000 0 1.8 1.83 1.86 1.89 1.92 1.95 1.98 2.01 2.04 A djus ted output voltage Vo,adj(V) 2.07 2.1
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.805V Vo,adj is the adjusted output voltage. Rtrim-up is the resistance required between TRIM and GND.
(c)2006 Bel Fuse Inc.
Specifications subject to change without notice. 02.06
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com page 16
NON-ISOLATED DC/DC CONVERTERS
5V Input / 0.9V - 3.3V Output / 8A
POWER PRODUCTS
BP06xRAH-08B
Output Voltage Set-Point Adjustment
xRAH-08B150 Trim Resistor Calculation
1.5 . 10
4 4
Trim resistor value Rtrim_down(Kohm)
1.35 . 10
4 1.2 . 10
Rtrim-down = (
where,
122.255 - 522)ohm Vo - Vo, adj
1.05 . 10
4
9000 7500 6000 4500 3000 1500 0 1.35 1.37 1.38 1.4 1.41 1.43 1.44 1.46 1.47 1.49 Adjusted output voltage Vo,adj (V) 1.5
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.503V Vo,adj is the adjusted output voltage. Rtrim-down is the resistance required between TRIM and Vo.
1.5 . 10
4 4 4
Trim resistor value,Rtrim_up(Kohm)
1.35 . 10
Rtrim-up = (
where,
139.2 - 348)ohm Vo, adj - Vo
1.2 . 10
4 1.05 . 10
9000 7500 6000 4500 3000 1500 0 1.5 1.51 1.53 1.54 1.56 1.58 1.59 1.61 1.62 Adjusted output voltage Vo,adj(V) 1.64 1.65
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.503V Vo,adj is the adjusted output voltage. Rtrim-up is the resistance required between TRIM and GND.
(c)2006 Bel Fuse Inc.
Specifications subject to change without notice. 02.06
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com page 17
POWER PRODUCTS
BP06xRAH-08B
NON-ISOLATED DC/DC CONVERTERS
5V Input / 0.9V - 3.3V Output / 8A
Output Voltage Set-Point Adjustment
xRAH-08B120 Trim Resistor Calculation
5000
Trim resistor value Rtrim_down(Ohm)
4500 4000 3500 3000 2500 2000 1500 1000 500 0 1 1.02 1.04 1.06 1.08 1.1 1.12 1.14 1.16 A djus ted output voltage Vo,adj (V) 1.18 1.2
Rtrim -down = (
where,
40.38 - 200)ohm Vo - Vo, adj
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.204V Vo,adj is the adjusted output voltage. Rtrim-down is the resistance required between TRIM and Vo.
1. 10
4
Rtrim -up
where,
80 =( - 100)ohm Vo, adj - Vo
Trim resistor value,Rtrim_up(Ohm)
9000 8000 7000 6000 5000 4000 3000 2000 1000 0 1.2 1.22 1.24 1.26 1.28 1.3 1.32 1.34 1.36 A djus ted output voltage Vo,adj(V) 1.38 1.4
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.204V Vo,adj is the adjusted output voltage. Rtrim-up is the resistance required between TRIM and GND.
(c)2006 Bel Fuse Inc.
Specifications subject to change without notice. 02.06
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com page 18
POWER PRODUCTS
BP06xRAH-08B
NON-ISOLATED DC/DC CONVERTERS
5V Input / 0.9V - 3.3V Output / 8A
Output Voltage Set-Point Adjustment
xRAH-08B100 Trim Resistor Calculation
1000
Trim resistor value Rtrim_down(Ohm)
900 800 700 600 500 400 300 200 100 0 0.85 0.86 0.88 0.9 0.91 0.93 0.94 0.95 0.97 A djus ted output voltage Vo,adj (V) 0.98 1
Rtrim -down = (
where,
10.544 - 63.2)ohm Vo - Vo, adj
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.006V Vo,adj is the adjusted output voltage. Rtrim-down is the resistance required between TRIM and Vo.
1. 10
4
Rtrim -up = (
where,
Trim resistor value,Rtrim_up(Ohm)
40.88 - 12.1)ohm Vo, adj - Vo
9000 8000 7000 6000 5000 4000 3000 2000 1000 0 1 1.02 1.04 1.06 1.08 1.1 1.12 1.14 1.16 A djus ted output voltage Vo,adj(V) 1.18 1.2
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.006V Vo,adj is the adjusted output voltage. Rtrim-up is the resistance required between TRIM and GND.
(c)2006 Bel Fuse Inc.
Specifications subject to change without notice. 02.06
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com page 19
POWER PRODUCTS
BP06xRAH-08B
NON-ISOLATED DC/DC CONVERTERS
5V Input / 0.9V - 3.3V Output / 8A
Output Voltage Set-Point Adjustment
xRAH-08B090 Trim Resistor Calculation
400
Trim resistor value Rtrim_down(Ohm)
360 320 280 240 200 160 120 80 40 0 0.85 0.855 0.86 0.865 0.87 0.875 0.88 0.885 0.89 A djus ted output voltage Vo,adj (V) 0.895 0.9
Rtrim -down
where,
2.751 =( - 38.2)ohm Vo - Vo, adj
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=0.905V Vo,adj is the adjusted output voltage. Rtrim-down is the resistance required between TRIM and Vo.
1. 10
4
Rtrim -up = (
where,
20.88 - 12.1)ohm Vo, adj - Vo
Trim resistor value,Rtrim_up(Ohm)
9000 8000 7000 6000 5000 4000 3000 2000 1000 0 0.9 0.91 0.92 0.93 0.94 0.95 0.96 0.97 0.98 A djus ted output voltage Vo,adj(V) 0.99 1
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=0.905V Vo,adj is the adjusted output voltage. Rtrim-up is the resistance required between TRIM and GND.
(c)2006 Bel Fuse Inc.
Specifications subject to change without notice. 02.06
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com page 20
NON-ISOLATED DC/DC CONVERTERS
5V Input / 0.9V - 3.3V Output / 8A
POWER PRODUCTS
BP06xRAH-08B
Mechanical
SRAH-08B
Suggested PCB Pad Layout 0.400 [10.16] 0.065 [1.65]
0.60 [15.24]
0.050 [1.27]
0.855 [21.72]
0.110 [2.79]
0.70 [17.78]
R0.015 [R0.38] typ 0.100 [2.54] R0.008 [R0.20] typ
0.012 [0.30]
0-5
0.004 [0.10]
0.050 [1.27] 0.400 [10.16]
0.100 [2.54] 4x
0.320 [8.13] 0.020 [0.51]
0.055 [1.40] 2x 0.090 [2.29] 2x 0.780 [19.81]
Dimensions are in inches [millimeters]. Standard dimension tolerance is 0.005 [0.13] unless otherwise noted.
Pin 1 2 3 4 5 6 7
Function Remote On/Off +Vin Ground +Vo Trim No Connection No Connection
7
6
12345
(c)2006 Bel Fuse Inc.
Specifications subject to change without notice. 02.06
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com page 21
POWER PRODUCTS
BP06xRAH-08B
NON-ISOLATED DC/DC CONVERTERS
5V Input / 0.9V - 3.3V Output / 8A
0.700 [17.78]
Mechanical
VRAH-08B
0.600 [15.24]
0.050 [1.27]
0.265 [6.73] min
0.050 [1.27] 0.100 [2.54] 0.400 [10.16] 0.020 [0.51]
0.308 [7.82]
Dimensions are in inches [millimeters]. Standard dimension tolerance is 0.005 [0.13] unless otherwise noted.
Pin 1 2 3 4 5
Function Remote On/Off +Vin Ground +Vo Trim
12345
RoHS Compliance
Complies with the European Directive 2002/95/EC, calling for the elimination of lead and other hazardous substances from electronic products. These parts are not however compatible with the higher temperatures associated with lead free solder processes and must be soldered using a reflow profile with a peak temperature of no more than 240C.
(c)2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
CORPORATE
Bel Fuse Inc. 206 Van Vorst Street Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
FAR EAST
Bel Fuse Ltd. 8F / 8 Luk Hop Street San Po Kong Kowloon, Hong Kong Tel 852-2328-5515 Fax 852-2352-3706 www.belfuse.com
EUROPE
Bel Fuse Europe Ltd. Preston Technology Management Centre Marsh Lane, Suite G7, Preston Lancashire, PR1 8UD, U.K. Tel 44-1772-556601 Fax 44-1772-888366 www.belfuse.com
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